Front axle: Difference between revisions

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==Description - Complete Front Axle/Suspension==
== Parts ==
[[File:W220 Front Suspension Parts Identification 01.jpg|600px|center]]
{|
 
|[[File:W220_steering_knuckle_and_control_arm_epc.png|thumb|none|Steering knuckle and control arm-related parts in [[EPC]]]]
[[File:W220 Front Suspension Parts Identification 02.jpg|500px|center]]
|[[File:W220_torsion_bar_front_epc.png|thumb|none|Torsion bar front related parts in [[EPC]]]]
 
|}
===Transverse Control Arm Top or Upper Control Arm Item 85 - Complete Front Axle/Suspension===
Transverse Control Arm Top/Upper (also called Upper Control Arm (UCA)), Item 85 Right and Left.
[[File:Transverse Control Arm or Upper Control Arm.JPG|600px|center]]
 
===Steering Knuckle Item 5 - Complete Front Axle/Suspension===
Steering Knuckle (also Spindle or Hub) (Item 5)
[[File:Steering Knuckle Item 5.jpg|100px|center]]
 
===Transverse Control Arm Lower or Lower Control Arm Item 40 - Complete Front Axle/Suspension===
Transverse Control Arm Bottom/Lower (Lower Control Arm (LCA)) Item 40 Right and Left
[[File:Transverse Control Arm Bottom Item 40.JPG|500px|center]]
 
===Ball Joint Steering Knuckle to Lower Control Arm Item 10 - Complete Front Axle/Suspension===
Ball Joint Steering Knuckle to Lower Control Arm (Item 10)
[[File:Ball Joint Steering Knuckle to Lower Control Arm Item 10.JPG|500px|center]]
 
===Strut Item 65 - Complete Front Axle/Suspension===
Strut (also called Thrust Arm or Torque Strut) Item 65 Right and Left
[[File:Strut Item 65.JPG|500px|center]]
 
===Rod Torsion Bar Item 25 - Complete Front Axle/Suspension===
Rod Torsion Bar (Sway Bar Link) Item 25 Right and Left
[[File:Rod Torsion Bar Item 25.JPG|500px|center]]


==Part Numbers - Complete Front Axle/Suspension==
{| class="wikitable" style="margin-left: 0px;"
{| class="wikitable" style="margin: auto;"
|+W220 Front Suspension Part Numbers
|+W220 Front Suspension Part Numbers
|-
|-
Line 38: Line 14:
|-
|-
|5
|5
|A 220 330 37 20
|A2203303720
|STEERING KNUCKLE LEFT Code: -Z04
|STEERING KNUCKLE LEFT. Code: -Z04 (also known as spindle or hub)
[[File:Steering Knuckle Item 5.jpg|thumb|none|steering knuckle]]
|001
|001
|-
|-
|5
|5
|A 220 330 37 20
|A2203303820
|STEERING KNUCKLE RIGHT Code: -Z04
|STEERING KNUCKLE RIGHT Code: -Z04
|001
|001
|-
|-
|10
|10
|A 220 333 07 27
|A2203330727
|JOINT . LEFT
LEMFORDER 3377301 (EUR 20)
|001
|JOINT (left and right)
|-
[[File:Ball Joint Steering Knuckle to Lower Control Arm Item 10.JPG|thumb|none|Ball Joint Steering Knuckle to Lower Control Arm]]
|10
|A 220 333 07 27
|JOINT . RIGHT
|001
|001
|-
|-
|15
|15
|A 220 330 07 25
|A2203300725
|FRONT WHEEL HUB WITH BEARING
|FRONT WHEEL HUB WITH BEARING
|002
|002
|-
|-
|16
|16
|A 002 980 65 02
|A0029806502
|TAPERED ROLLER BEARING . WHEEL HUB, OUTSIDE. Code: -Z07
|TAPERED ROLLER BEARING. WHEEL HUB, OUTSIDE. Code: -Z07
|002
|002
|-
|-
|16
|16
|A 140 981 03 05
|A1409810305
|TAPERED ROLLER BEARING. WHEEL HUB, INSIDE. Code: -Z07
|TAPERED ROLLER BEARING. WHEEL HUB, INSIDE. Code: -Z07
|001
|001
|-
|-
|16
|16
|A 140 981 03 05
|A1409810305
|TAPERED ROLLER BEARING. WHEEL HUB, INSIDE
|TAPERED ROLLER BEARING. WHEEL HUB, INSIDE
|001
|001
|-
|-
|17
|17
|A 022 997 97 47
|A0229979747
|SEAL RING. WHEEL HUB . Code: -Z07
|SEAL RING. WHEEL HUB. Code: -Z07
|001
|001
|-
|-
|17
|17
|A 022 997 97 47
|A0229979747
|SEAL RING. WHEEL HUB
|SEAL RING. WHEEL HUB
|001
|001
|-
|-
|25
|25
|A 116 334 03 72
|A1163340372
|NUT FRONT WHEEL HUB TO STEERING KNUCKLE
|NUT FRONT WHEEL HUB TO STEERING KNUCKLE
|002
|002
|-
|25
|A2203201689 (left)
LEMFÖRDER 29311 01 (15 EUR)
|ROD AT TORSION BAR LEFT. Code: -487 (also called sway bar link / stabilizer link)
{|
|[[File:Lemforder_2931101.jpg|thumb|none|Stabilizer link (left)]]
|[[File:Lemforder_2721801_bushing.jpg|thumb|none|Stabilizer link bushing (LEMFÖRDER 2721801 (6 EUR))]]
|}
|001
|-
|25
|A2203201589 (right)
LEMFÖRDER 29310 01 (15 EUR)
|ROD AT TORSION BAR RIGHT. Code: -487
{|
|[[File:Lemforder_2931001.jpg|thumb|none|Stabilizer link (right)]]
|[[File:Lemforder_2721801_bushing.jpg|thumb|none|Stabilizer link bushing (LEMFÖRDER 2721801 (6 EUR))]]
|}
|001
|-
|-
|30
|30
|N 000000 003358
|N000000003358
|HEXALOBULAR BOLT FRONT WHEEL HUB TO STEERING KNUCKLE M6X25
|HEXALOBULAR BOLT FRONT WHEEL HUB TO STEERING KNUCKLE M6X25
|002
|002
|-
|-
|35
|35
|A 168 357 00 89
|A1683570089
|PLUG FRONT WHEEL HUB TO STEERING KNUCKLE
|PLUG FRONT WHEEL HUB TO STEERING KNUCKLE
|002
|002
|-
|-
|40
|40
|A 220 330 89 07
|A2203308907
|TRANSVERSE CONTROL ARM BOTTOM LEFT Code: -487-Z07
LEMFORDER 3442101 (EUR 50)
|TRANSVERSE CONTROL ARM BOTTOM LEFT Code: -487-Z07 (also known as spring control arm or lower control arm)
[[File:Transverse Control Arm Bottom Item 40.JPG|thumb|none|lower control arm (right and left)]]
[[File:Rear View of Transverse Control Arm Bottom Lower Item 40.jpg|thumb|none|Rear view of lower control arm]]
[[File:Front View of Transverse Control Arm Bottom Lower Item 40.JPG|thumb|none|Front view of lower control arm]]
|001
|001
|-
|-
|40
|40
|A 220 330 90 07
|A2203309007
LEMFORDER 3442201(EUR 50)
|TRANSVERSE CONTROL ARM BOTTOM RIGHT Code: -487-Z07
|TRANSVERSE CONTROL ARM BOTTOM RIGHT Code: -487-Z07
|001
|001
|-
|-
|45
|45
|A 220 330 91 07
|A2203309107
|TS SPRING LINK PARTS KIT LEFT AND RIGHT Code: -Z07 . [408] ONLY REPLACEABLE BY PAIRS
|TS SPRING LINK PARTS KIT LEFT AND RIGHT Code: -Z07. [408] ONLY REPLACEABLE BY PAIRS
|002
|002
|-
|-
|46
|46
|A 220 333 31 14
|A2203333114
|BEARING SPRING CONTROL ARM . . Code: -Z07
|BEARING SPRING CONTROL ARM. Code: -Z07
|002
|002
|-
|-
|47
|47
|A 211 323 00 68
|A2113230068
|JOINT. LEFT
LEMFORDER 2166702 (13 EUR)
|001
|Stabilizer bar pivot bushing for lower control arm (left and right)
|-
[[File:LEMFORDER_2166702_stabilizer_bar_pivot_bushing.jpg|100px]]
|47
|002
|A 211 323 00 68
|JOINT. RIGHT
|001
|-
|-
|50
|50
|A 220 333 00 71
|A2203330071
|BOLT SPRING CONTROL ARM AT FRAME M14X1.5
|BOLT SPRING CONTROL ARM AT FRAME M14X1.5
|002
|002
|-
|-
|50
|50
|A 220 333 01 71
|A2203330171
|FITTED BOLT FOR ADJUSTING WORK ONLY M14X1.5
|FITTED BOLT FOR ADJUSTING WORK ONLY M14X1.5
|002
|002
|-
|-
|55
|55
|A 220 333 00 76
|A2203330076
|SHIM SPRING CONTROL ARM AT FRAME
|SHIM SPRING CONTROL ARM AT FRAME
|004
|004
|-
|-
|60
|60
|N 000000 003281
|N000000003281
FEBI BILSTEIN 23696 (1 EUR)
|HEXAGON NUT SPRING CONTROL ARM AT FRAME M14X1,5
|HEXAGON NUT SPRING CONTROL ARM AT FRAME M14X1,5
[[File:N000000003281.jpg|200px]]
|002
|002
|-
|-
|64
|64
|N 000000 003281
|N000000003281
|HEXAGON NUT SPRING LINK ON SUPPORTING JOINT M14X1,5
|HEXAGON NUT SPRING LINK ON SUPPORTING JOINT M14X1,5
|002
|002
|-
|-
|65
|65
|N 000000 003281
|A2203305711
|STRUT LEFT
LEMFORDER 3123501 (EUR 72)
|STRUT LEFT (also called Thrust Arm or Torque Strut)
[[File:Strut Item 65.JPG|thumb|none|Thrust arm (right and left)]]
[[File:Item 65 Strut (Thrust Arm or Torque Strut).JPG|thumb|none|Thrust arm]]
|001
|001
|-
|-
|65
|65
|N 000000 003281
|A2203305811
LEMFORDER 3123601 (EUR 72)
|STRUT RIGHT
|STRUT RIGHT
|001
|001
|-
|-
|70
|70
|A 220 333 00 71
|A2203330071
|BOLT STRUT AT FRAME M14X1.5
|BOLT STRUT AT FRAME M14X1.5
|002
|002
|-
|-
|70
|70
|A 220 333 01 71
|A2203330171
|FITTED BOLT FOR ADJUSTING WORK ONLY M14X1.5
|FITTED BOLT FOR ADJUSTING WORK ONLY M14X1.5
|002
|002
|-
|-
|75
|75
|A 220 333 00 76
|A2203330076
|SHIM STRUT AT FRAME
|SHIM STRUT AT FRAME
|004
|004
|-
|-
|80
|80
|N 000000 003281
|N000000003281
|HEXAGON NUT STRUT AT FRAME M14X1,5
|HEXAGON NUT STRUT AT FRAME M14X1,5
|002
|002
|-
|-
|84
|84
|N 000000 003281
|N000000003281
|HEXAGON NUT STRUT TO STEERING KNUCKLE M14X1,5
|HEXAGON NUT STRUT TO STEERING KNUCKLE M14X1,5
|002
|002
|-
|-
|85
|85
|A 220 330 93 07
|A2203309307
|TRANSVERSE CONTROL ARM TOP, LEFT
LEMFORDER 2099202 (EUR 120)
|TRANSVERSE CONTROL ARM TOP, LEFT (also called Upper Control Arm - UCA)
[[File:Transverse Control Arm or Upper Control Arm.JPG|thumb|none|Transverse control arm top (right and left)]]
[[File:Transverse Control Arm Top or Upper Item 85.jpg|thumb|none|Transverse control arm]]
|001
|001
|-
|-
|85
|85
|A 220 330 94 07
|A2203309407
 
LEMFORDER 2099302 (EUR 120)
|TRANSVERSE CONTROL ARM TOP, RIGHT
|TRANSVERSE CONTROL ARM TOP, RIGHT
|001
|001
|-
|-
|90
|90
|A 004 990 81 04
|A0049908104
|BOLT UPPER CONTROL ARM TO FRAME M10X95
|BOLT UPPER CONTROL ARM TO FRAME M10X95
|004
|004
|-
|-
|95
|95
|N 913023 010002
|N913023010002
|NUT UPPER CONTROL ARM TO FRAME M10
|NUT UPPER CONTROL ARM TO FRAME M10
|004
|004
|-
|-
|100
|100
|N 910113 010000
|N910113010000
|HEXAGON NUT UPPER TRANSVERSE CONTROL ARM TO STEERING KNUCKLE M10
|HEXAGON NUT UPPER TRANSVERSE CONTROL ARM TO STEERING KNUCKLE M10
|002
|002
|-
|-
|110
|110
|A 000 330 00 18
|A0003300018
|TS BOLT PARTS KIT FOR ADJUSTING WORK ONLY
|TS BOLT PARTS KIT FOR ADJUSTING WORK ONLY
|004
|004
|}
|}


Steering-related parts (e.g., tie rod) are described in [[steering linkage]] page.


* Front end lower shock mount control arms (ABC models only) are part number 215 330 07 07.
Common issues with the front axle/suspension are:
* FL thrust arm (Lemfoerder): W0133-1717286
* FR thrust arm (Lemfoerder): W0133-160157.
* All of those come with new ball joints installed.
 
==Issues - Complete Front Axle/Suspension==
Common issues with the Complete Front Axle/Suspension are;
* Front tyre/s wearing unevenly.
* Front tyre/s wearing unevenly.
* Front suspension making a creaking sound at low speed indicating possible ball joint failure.
* Front suspension making a creaking sound at low speed indicating possible ball joint failure.
* Looseness indicated by excess movement in ball joint/s (Item 100) ie it feels worn and not firm in its socket.
* Looseness indicated by excess movement in ball joint/s. I.e., it feels worn and not firm in its socket.
* Cracks in the control arm (Item 85) bushings and ball joints.
* Cracks in the control arm (Item 85) bushings and ball joints.
[[File:Circumferential Cracks In Rubber Parts Of Control Arm (85) Bushings.jpg|300px|center]]
[[File:Circumferential Cracks In Rubber Parts Of Control Arm (85) Bushings.jpg|thumb|none|Cracks in the control arm bushings.]]


If you experience any of the above issues, the following parts are the ones that often need replacing due to wear after about 130,000 Km (80,000 miles).
If you experience any of the above issues, the following parts are the ones that often need replacing due to wear after about 130,000 Km (80,000 miles).
* The front rear lower control arms (shock mount control arms) are not a "must replace" item. If your car has higher miles (80k+), then it would be a good idea to replace them as well. The outer end of the arm can be quite tricky to force off the ball joint at the knuckle (spindle).
* The thrust arms (torque arms) wear out faster, as they take the brunt force of the vehicle under braking. Once you pull out the thrust arms, take a look at the chassis side joint. If the rubber has clearly failed (lots of cracks), then it may be a good idea to change the shock control arms as well.


The front rear lower control arms (shock mount control arms) are not a "must replace" item. If your car has higher miles (80k+), then it would be a good idea to replace them as well. The outer end of the arm can be quite tricky to force off the ball joint at the knuckle (spindle).
==Tips for DIY repairs==
 
The thrust arms (torque arms) wear out faster, as they take the brunt force of the vehicle under braking. Once you pull out the thrust arms, take a look at the chassis side joint. If the rubber has clearly failed (lots of cracks), then it may be a good idea to change the shock control arms as well.
 
* Item 85 Transverse Control Arm Top (Upper Control Arm (UCA)).
[[File:Transverse Control Arm Top or Upper Item 85.jpg|400px|center]]
[[File:Transverse Control Arm or Upper Control Arm.JPG|400px|center]]
 
* Item 40 Transverse Control Arm Bottom/Lower (Lower Control Arm (LCA))
** Rear View of Transverse Control Arm Bottom Lower Item 40
[[File:Rear View of Transverse Control Arm Bottom Lower Item 40.jpg|400px|center]]
** Front View of Transverse Control Arm Bottom Lower Item 40
[[File:Front View of Transverse Control Arm Bottom Lower Item 40.JPG|400px|center]]
[[File:Transverse Control Arm Bottom Item 40.JPG|400px|center]]
 
* Item 65 Strut (Thrust Arm or Torque Strut)
[[File:Item 65 Strut (Thrust Arm or Torque Strut).JPG|400px|center]]
[[File:Strut Item 65.JPG|400px|center]]
 
* Item 10 Joint (Ball Joint)
[[File:Ball Joint Steering Knuckle to Lower Control Arm Item 10.JPG|400px|center]]
 
* Item 25 Rod Torsion Bar (Sway Bar Link)
[[File:Rear View of Transverse Control Arm Bottom Lower Item 40.jpg|400px|center]]
[[File:Rod Torsion Bar Item 25.JPG|400px|center]]
 
==Special Tools Required - Complete Front Axle/Suspension==
[http://w220.ee/Special_Tools Special Tools]
 
==Tips for DIY Repairs - Complete Front Axle/Suspension==
* Make absolutely certain that the car is properly and safely supported. You will be pulling and pushing hard on the car while you are under it.
* Make absolutely certain that the car is properly and safely supported. You will be pulling and pushing hard on the car while you are under it.
 
* It might be helpful to kept all new parts in the freezer for a few days to shrink them before assembly because the fit tolerances are so tight. Remove each part from the freezer until just prior to installing the part.
* atmshsr says “On a recommendation of a machinist, I kept all new parts in the freezer for a few days to shrink them before assembly because the fit tolerances are so tight, and did not remove each part until just prior to installing the part.“
 
* Make sure to soak all the bolt/nuts a few hours before you start work with PB blaster or Penetrene.
* Make sure to soak all the bolt/nuts a few hours before you start work with PB blaster or Penetrene.
 
* In hindsight, it is useful to replaced both the strut (also called Thrust Arm or Torque Strut) and control arms (upper control arm and lower control arm) at the same time because they have similar bushings that undergo the same service environment. Additionally, if doing both control arms, for easier access to a ball joint and ease reinstallation it is helpful to completely remove the Steering Knuckle (also called spindle or hub).
* BenzWorld Member Tip: In hindsight, I should have replaced both the Strut (also called Thrust Arm or Torque Strut) Item 65, and control arms
** Transverse Control Arm Top/Upper (also called Upper Control Arm (UCA)), Item 85
** Transverse Control Arm Bottom/Lower (Lower Control Arm (LCA)), Item 40
at the same time because they have similar bushings that undergo the same service environment. Additionally, if I had to do it over, I would do both control arms and completely remove the Steering Knuckle (also Spindle or Hub) (Item 5) for easier access to a ball joint and ease reinstallation.  
 
* Take your time disconnecting and reconnecting any of the electrical connectors in the area - its easy to mess these up. Use some masking tape to mark the connections.
* Take your time disconnecting and reconnecting any of the electrical connectors in the area - its easy to mess these up. Use some masking tape to mark the connections.
* Once the car is jacked up and the wheels removed, release the air pressure on the top of the shock. With the key off, and the vehicle raised up, crack open the fitting at the top of the airmatic strut. Be careful not to allow any dirt in the system. Once everything is connected back up it will just fill back up once the car is turned on.
* Once the car is jacked up and the wheels removed, release the air pressure on the top of the shock. With the key off, and the vehicle raised up, crack open the fitting at the top of the airmatic strut. Be careful not to allow any dirt in the system. Once everything is connected back up it will just fill back up once the car is turned on.
 
* When using the Ball Joint Separator tool (and you have a lot of free time), tighten it, walk away. Come back a few hours later, tighten it a little more and walkway. Repeat the steps. The ball joint normally breaks loose due to tension. If you are lucky it will let go after about 30-40 minutes.
* When using the Ball Joint Separator tool, tighten it, walk away. Come back a few hours later, tighten it a little more and walkway. Repeat the steps. The ball joint normally breaks loose due to tension. If you are lucky it will let go after about 30-40 minutes.
 
* Use a hot air dryer on each stuck nut for about five mins each and they come out easy, the heat breaks down the lock-tight bond.
* Use a hot air dryer on each stuck nut for about five mins each and they come out easy, the heat breaks down the lock-tight bond.
* The 5mm Alan has blue Loctite from the factory and normally requires an impact grade driver to remove. If you end up rounding the Alan out, (which can easily happen) then the drill must come out and carefully drill out the set screw. Here's how to remove them using a a miniature butane torch [http://www.benzworld.org/forums/w220-s-class/2194369-airmatic-strut-set-screw-removal-heat.html#post10544537]
* The 5mm Alan has blue Loctite from the factory and normally requires an impact grade driver to remove. If you end up rounding the Alan out, (which can easily happen) then the drill must come out and carefully drill out the set screw. Here's how to remove them using a a miniature butane torch [http://www.benzworld.org/forums/w220-s-class/2194369-airmatic-strut-set-screw-removal-heat.html#post10544537]
* Good website for more tips on how to get set screws out and ball joints separated. [http://www.benzworld.org/forums/w220-s-class/1943450-big-trouble-controlarmsville-please-help.html]
* Good website for more tips on how to get set screws out and ball joints separated. [http://www.benzworld.org/forums/w220-s-class/1943450-big-trouble-controlarmsville-please-help.html]
 
* If you are doing this DIY with a jack and stands the easiest way is to remove the Steering Knuckle (also called spindle or hub) with the arms attached after removing the brake caliper. Just remove the tie rod end from the knuckle then disconnect the strut from the control arm, followed by releasing the upper control arm from the knuckle then control arms from the chassis. This way it is a lot easier to remove the arms from the knuckle on a work-bench.  
* If you are doing this DIY with a jack and stands the easiest way is to remove the Steering Knuckle (also Spindle or Hub) (Item 5) with the arms attached after removing the brake caliper. Just remove the tie rod end from the knuckle then disconnect the strut from the control arm, followed by releasing the upper control arm from the knuckle then control arms from the chassis. This way it is a lot easier to remove the arms from the knuckle on a work-bench.  
* Removing the Steering Knuckle (also called spindle or hub) as a first step really frees up the area for further work. Please note that it is essential to use a 5mm hex key to hold the center stud from turning when removing the 21mm nut at the wheel hub. A long handled key with a Blackhawk brand 21mm ratcheting closed end wrench is useful.
 
* After strut replacement the correct procedure is to do a ride height adjustment using M-B's Star Diagnosis System (SDS) and then a four wheel alignment, failure to do so will result in bad tyre wear. (not verified)
* Removing the Steering Knuckle (also Spindle or Hub) (Item 5) as a first step really frees up the area for further work. Please note that it is essential to use a 5mm hex key to hold the center stud from turning when removing the 21mm nut at the wheel hub. A long handled key with a Blackhawk brand 21mm ratcheting closed end wrench is useful.
 
* After strut replacement the correct procedure is to do a ride height adjustment using M-B's Star Diagnosis System (SDS) and then a four wheel alignment, failure to do so will result in bad tyre wear.
 
* As long as you do not extend or shorten the Tie-Rod, from the inner tie rod, after it is disconnected from the steering knuckle, there is no need for alignment. So, leave the Tie-rod alone after you separate it from the knuckle.
* As long as you do not extend or shorten the Tie-Rod, from the inner tie rod, after it is disconnected from the steering knuckle, there is no need for alignment. So, leave the Tie-rod alone after you separate it from the knuckle.
* When you are done with repair, put the wheels on and carefully lower the vehicle back down with the weight of the car resting on the suspension. '''THEN''', tighten the airmatic fittings and turn the car on. The vehicle should return back to its normal height. Only tighten the lower control arm bolt to the vehicle fitting with the vehicle weight fully on the wheels (or lower the car onto car ramps), as this will prevent the rubber from being torqued and tearing in the lower control arm.
* When you are done with repair, put the wheels on and carefully lower the vehicle back down with the weight of the car resting on the suspension. '''THEN''', tighten the airmatic fittings and turn the car on. The vehicle should return back to its normal height. Only tighten the lower control arm bolt to the vehicle fitting with the vehicle weight fully on the wheels (or lower the car onto car ramps), as this will prevent the rubber from being torqued and tearing in the lower control arm.


==DIY Repairs - Complete Front Axle/Suspension==
==Special Tools Required==
Before starting any DIY repairs make sure to read the Tips section above.
[http://w220.ee/Special_Tools Special Tools]
 
<!--
===DIY How To Remove Ball Joints Using a Ball Joint Separater Tool===
http://www.benzworld.org/forums/w220-s-class/1519699-w220-ball-joint-replacement-diy-tutorial.html
 
===DIY How To Remove Ball Joints Using a Ball Peen Hammer===
{|
{|
|{{#ev:youtube|https://www.youtube.com/watch?v=TAlXap77-v4|320|left|How To Remove Ball Joints Using a Ball Peen Hammer.|frame}}
|{{#ev:youtube|https://www.youtube.com/watch?v=TAlXap77-v4|320|left|How To Remove Ball Joints Using a Ball Peen Hammer.|frame}}
|}
|}
 
-->
===DIY How to Replace Front Lower Control Arm Bushings===
==How to Replace Front Lower Control Arm Bushings==
http://www.benzworld.org/forums/w220-s-class/1810897-02-s500-lower-control-arm-bushings.html
http://www.benzworld.org/forums/w220-s-class/1810897-02-s500-lower-control-arm-bushings.html


===DIY Fitted Bolt===
== Fitted Bolt ==
The Transverse Control Arm and Thrust Arm uses standard bolt A2203330071 fitted at factory.
The Transverse Control Arm and Thrust Arm uses standard bolt A2203330071 fitted at factory.
After an accident or through years of heavy use the chassis of the vehicle deforms which causes problems for suspension geometry adjustment.
After an accident or through years of heavy use the chassis of the vehicle deforms which causes problems for suspension geometry adjustment.
For more flexible suspention adjustment a fitted bolt A2203330171 can be installed.
For more flexible suspension adjustment a fitted bolt A2203330171 can be installed. See [[wheel alignment]].
[[File:W220_A2203330171_fitted_bolt.jpg|thumb|none|Fitted bolt (A2203330171)]]
[[File:W220_A2203330171_fitted_bolt.jpg|thumb|none|Fitted bolt (A2203330171)]]


=== Replace supporting joint ===
== Replace supporting joint ==
<!-- AR33.20-P-0440I
<!-- AR33.20-P-0440I
MODEL 215
MODEL 215
Line 342: Line 296:
# Install in the reverse order
# Install in the reverse order


=== Remove/install torque strut at front axle ===
'''The ball joint can be replaced without removing the steering knuckle (only by disconnecting the upper control arm).'''
 
Replacing support joint without removing steering knuckle:
# Jack up side of the car
# Remove wheel
# Disconnect upper control arm
# Tilt the steering knuckle; unscrew ball joint nut; remove spring control arm from ball joint
# Reconnect upper control arm (tighten nut only lightly)
# Turn steering wheel to obtain maximum toe in
# Press out old ball joint; press new one in
# Turn steering wheel back to center
# Disconnect upper control arm
# Tilt the steering knuckle; reattach spring control arm; tighten ball joint nut
# Reconnect upper control arm and tighten nut
 
{|
|{{#ev:youtube|https://www.youtube.com/watch?v=aPw5Y3fwmqM|320|left|Pressing out supporting joint.|frame}}
|{{#ev:youtube|https://www.youtube.com/watch?v=qo2P10X2IjM|320|left|Pressing out supporting joint.|frame}}
|{{#ev:youtube|https://www.youtube.com/watch?v=jntvXHKUYTE|320|left|Replacing lower ball joint.|frame}}
|}
 
This video shows in detail how to replace the Ball Joint outside of the car (with the steering knuckle removed from the car):
{|
|{{#ev:youtube|https://www.youtube.com/watch?v=fbZi4Xrxj-U|320|left|Replace Lower Ball Joint (By Masood)|frame}}
|[[File:W220_front_right_ball_joint_pressing_in.jpg|thumb|none|Pressing in the ball join]]
|}
 
http://www.benzworld.org/forums/w220-s-class/1519699-w220-ball-joint-replacement-diy-tutorial.html
 
== Remove/install torque strut at front axle ==
<!--
<!--
AR33.15-P-0160I
AR33.15-P-0160I
Line 379: Line 362:
* Self-locking nut, radius rod to steering knuckle: Stage 1: Nm 50, Stage 2: Angle 60.
* Self-locking nut, radius rod to steering knuckle: Stage 1: Nm 50, Stage 2: Angle 60.


=== Remove/install steering knuckle ===
{|
|{{#ev:youtube|https://www.youtube.com/watch?v=V6LKJj6-6qY|320|left|Torque strut replacement.|frame}}
|}
 
== Remove/install spring control arm on front axle ==
<!-- AR33.15-P-0170I, Remove/install spring control arm on front axle, 13.4.11
MODEL 215
MODEL 220 (except 220.08 /18 /87)
except CODE (979) Special protection version
except CODE (Z07) Top protection
-->
 
{|
|
* 5 - Steering knuckle
* 18 - Torque strut
* 18b - Nut
|[[File:W220_Remove_install_spring_control_arm_on_front_axle.jpg|200px]]
|}
 
{|
|Shown on spring control arm without thrust plates:
* 17 - Spring control arm
* 17a - Screw
* 17b - Self-locking nut
* 17c - Nut
* 23 - Link rod
* 23c - Nut
* 40 - Suspension strut
* 40c - Bolts
|[[File:W220_Remove_install_lower_control_arm_on_front_axle.jpg|600px]]
|}
 
Remove/install:
# Raise vehicle with vehicle lift
# Remove front wheel
# Detach torque strut (18) from steering knuckle (5). Installation: Install new nut (18b). Check rubber boot on ball head of torque strut (18) for damage. If rubber boot is damaged, install new torque strut (18). ''Alternatively, it might be easier to detach upper control arm from steering knuckle.''
# Vehicles with [[Airmatic|AIRmatic]] (semi-active air suspension), code 489: Unscrew nut (23c) and pry link rod (23) off spring control arm (17). Installation: Press link rod (23) onto hexagon of stabilizer bar pivot bushing at spring control arm (17). Check rubber boot of stabilizer bar pivot bushing of link rod (23) at spring control arm (17) for damage, install new stabilizer bar pivot bushing if necessary.
# Remove bolts (40c) from spring strut (40). Installation: After tightening the bolts (40c) must be flush with the suspension strut (40) or slightly recessed.
# Using a suitable lever, loosen spring strut (40) at ball joint. Check rubber boot of ball joint for damage and install new spring control arm (17) if necessary.
# Press spring control arm (17) out of steering knuckle (5). Installation: Replace self-locking nut (17b).
# Vehicles with Active Body Control ([[ABC]]) (option code [[Option_codes##487_-_ABC_SUSPENSION_.28ACTIVE_BODY_CONTROL.29|487 - ABC SUSPENSION (ACTIVE BODY CONTROL)]]), when removing right spring control arm (17). Remove the pressure-supply circuit's valve body from the right side of the front subframe and tie it to one side.
# Remove spring control arm (17) from front subframe.  Do not twist bolt (17a). Always counter the bolt (17a) when slackening the nut (17c), otherwise the locating tabs for camber adjustment in the rubber bushing of spring control arm (17) will be sheared off. Installation: Screw nut (17c) all the way onto bolt (17a) but do not tighten, so that the rubber bushing of spring control arm (17) can turn when the suspension is compressed. Do not tighten nut (17c) until in ready-to-drive condition.
# Install in the reverse order
# Perform wheel alignment check
 
Torque specifications:
* Front axle stabilizer bar, Nut, link rod to spring control arm: 150 Nm
* Suspension struts, Bolt, front suspension strut to spring control arm: 20 Nm
* Wheel location, hub: Self-locking nut, track control arm to stub axle: Stage 1: 50 Nm, Stage 2: 60°
* Wheel location, hub: Self-locking nut, spring control arm to front axle carrier: Stage 1: 80 Nm, Stage 2: 120°
 
{|
|{{#ev:youtube|https://www.youtube.com/watch?v=nhWV5mIgG3Y|320|left|Replace L Control Arm and Torque Strut (By Masood)|frame}}
|}
 
== Remove/install steering knuckle ==
<!-- AR33.25-P-0400I Remove/install steering knuckle
<!-- AR33.25-P-0400I Remove/install steering knuckle
MODEL 215
MODEL 215
Line 422: Line 461:
* Bolt brake cover plate to steering knuckle / wheel carrier: M6 Nm 10
* Bolt brake cover plate to steering knuckle / wheel carrier: M6 Nm 10


===Inspect front axle joint for play, inspect rubber boots===
==Inspect front axle joint for play, inspect rubber boots==
<!-- AP33.20-P-3353BA Inspect front axle joint for play, inspect rubber boots 22.10.07
<!-- AP33.20-P-3353BA Inspect front axle joint for play, inspect rubber boots 22.10.07
MODEL 124, 129, 140, 170, 202, 208, 210, 215, 220, 230
MODEL 124, 129, 140, 170, 202, 208, 210, 215, 220, 230
Line 446: Line 485:
# Check follower joint for play. If there is play in the upper ball joint, replace upper transverse control arm or upper ball joint.
# Check follower joint for play. If there is play in the upper ball joint, replace upper transverse control arm or upper ball joint.


==== Checking supporting joint and follower joint of steering knuckle mount (removed) ====
=== Checking supporting joint and follower joint of steering knuckle mount (removed) ===
<!-- AR33.20-P-0425I Checking supporting joint and follower joint of steering knuckle mount (removed) 26.10.05
<!-- AR33.20-P-0425I Checking supporting joint and follower joint of steering knuckle mount (removed) 26.10.05
MODEL 211, 215, 220, 230 -->
MODEL 211, 215, 220, 230 -->
Line 461: Line 500:
# Check rubber boot (8f) on follower joint for cracks and damage. If necessary, replace follower joint or upper transverse control arm. For upper transverse control arms made of die-cast aluminum the upper transverse control arms must be replaced. For upper transverse control arms made of sheet metal aluminum the follower joint must be replaced.
# Check rubber boot (8f) on follower joint for cracks and damage. If necessary, replace follower joint or upper transverse control arm. For upper transverse control arms made of die-cast aluminum the upper transverse control arms must be replaced. For upper transverse control arms made of sheet metal aluminum the follower joint must be replaced.


==== Checking follower joint of steering knuckle mount (installed) ====
=== Checking follower joint of steering knuckle mount (installed) ===
<!-- AR33.20-P-0426I Checking follower joint of steering knuckle mount (installed) 26.10.05
<!-- AR33.20-P-0426I Checking follower joint of steering knuckle mount (installed) 26.10.05
MODEL 211 (except 211.08 /09 /28 /29)
MODEL 211 (except 211.08 /09 /28 /29)
Line 476: Line 515:
# Check rubber boot (8f) for signs of cracks and damage and, if necessary, replace upper transverse control arm or follower joint. For upper transverse control arms made of die-cast aluminum the upper transverse control arms must be replaced. For upper transverse control arms made of sheet metal aluminum the follower joint must be replaced.
# Check rubber boot (8f) for signs of cracks and damage and, if necessary, replace upper transverse control arm or follower joint. For upper transverse control arms made of die-cast aluminum the upper transverse control arms must be replaced. For upper transverse control arms made of sheet metal aluminum the follower joint must be replaced.
# Check play of follower joint and, if necessary, replace upper transverse control arm or follower joint. Feel the ball joint for signs of play while forcefully pushing and pulling the front wheel. For upper transverse control arms made of die-cast aluminum the upper transverse control arms must be replaced. For upper transverse control arms made of sheet metal aluminum the follower joint must be replaced.
# Check play of follower joint and, if necessary, replace upper transverse control arm or follower joint. Feel the ball joint for signs of play while forcefully pushing and pulling the front wheel. For upper transverse control arms made of die-cast aluminum the upper transverse control arms must be replaced. For upper transverse control arms made of sheet metal aluminum the follower joint must be replaced.
# Check rubber boot (8f) for leaktightness and condition. If rubber boot is leaking (e.g. grease leaking out) install new upper transverse control arm (6).
=== Check front axle supporting joints ===
<!-- AR33.20-P-0429T Check front axle supporting joints 30.10.08
MODEL 211 (except 211.08 /09 /28 /29)
MODEL 215, 219
MODEL 220 (except 220.08 /18)
MODEL 230 -->
{|
|
* 7 - Support joint
|[[File:W220_Check_front_axle_supporting_joints_1.jpg]] [[File:W220_Check_front_axle_supporting_joints_2.jpg]]
|}
# Check rubber boot of supporting joint (7) for cracks and damage
# Check play in supporting joint (7).
# With pit or drive-on platform with guard edge check play by moving the front wheel up and down.
## Checking by hand: Replace supporting joint if play is perceptible.
## Checking with dial indicator: Replace supporting joint if play > 0.6 mm.
# On vehicle lift check play by moving the front wheel up and down while simultaneously feeling the supporting joint (an assistant is required). Replace supporting joint if play is perceptible.
== Remove/install upper control arm ==
<!-- AR33.20-P-0500I Remove/install upper control arm 27.8.08
MODEL 215, 220 -->
[[File:W220_remove_install_upper_control_arm.png]]
# Remove front wheel
# Separate plug connection from level sensor.
# Detach link rod (arrow) from level sensor on the upper transverse control arm (6)
# Press follower joint (8) out of steering knuckle (5)
# Secure steering knuckle (5) with wire to prevent it from swinging away
# When removing the right upper transverse control arm, detach coolant expansion reservoir and put to one side. Do not detach the coolant hoses.
# Remove upper control arm (6) from frame. Installation: Do not tighten nuts until vehicle is ready to roll. Counterhold nut with suitable box wrench.
# Check follower joint
# Install in the reverse order
Torque specifications:
* Self-locking nut of upper wishbone on front end: Nm 50
* Self-locking nut, upper wishbone follower joint to steering knuckle: Stage 1: Nm 20, Stage 2: ° 90
* Nut, level sensor link rod to upper control arm: Nm 10
{|
|{{#ev:youtube|https://www.youtube.com/watch?v=k2HS41mJ0qA|320|left|Automotive Front Suspension Ball Joint Removal Tip|frame}}
|{{#ev:youtube|https://www.youtube.com/watch?v=_4dWy53BW8k|320|left|2002 S430 front right upper control arm removal|frame}}
|}
{|
|[[File:W220_front_left_upper_control_arm_ball_joint_removal.jpg|thumb|none|Detaching level sensor and ball joint]]
|[[File:W220_front_left_upper_control_arm_attachment_bolt_1.jpg|thumb|none|Bolt attaching the left-side upper control arm (1)]]
|[[File:W220_front_left_upper_control_arm_attachment_bolt_2.jpg|thumb|none|Bolt attaching the left-side upper control arm (2)]]
|}
{|
|[[File:W220_front_right_upper_control_arm_attachment_bolt_1.jpg|thumb|none|Bolt attaching the right-side upper control arm (1)]]
|[[File:W220_front_right_upper_control_arm_attachment_bolt_2.jpg|thumb|none|Bolt attaching the right-side upper control arm (2)]]
|}
=== Replacing bushings for upper control arm ===
MB is not selling bushings for upper control arm separately. However, FAG is selling bushing under a part number 829026210 (10 EUR).
Pushing out the original LEMFÖRDER bushing is quite easy as the compression range for the bushing is just a few millimeters. FAG bushing has a much larger compression range (see below).
In practice, it is unlikely that bushing replacement would be useful, because the ball joint (which cannot be replaced) usually goes out of order sooner than the rubber bushings.
{|
|[[File:W220_upper_control_arm_bushing_lemforder_vs_fag_829026210.jpg|thumb|none|LEMFÖRDER bushing vs FAG bushing]]
|[[File:W220_upper_control_arm_LEMFORDER_bushing_compression_startpoint.jpg|thumb|none|Compression startpoint for LEMFÖRDER bushing]]
|[[File:W220_upper_control_arm_FAG_bushing_compression_startpoint.jpg|thumb|none|Compression startpoint for FAG bushing]]
|}
{|
|[[File:W220_upper_control_arm_pushing_out_bushing.jpg|thumb|none|Pushing out bushing]]
|[[File:W220_upper_control_arm_compressing_in_bushing.jpg|thumb|none|Compressing in bushing]]
|}
== Remove/install front wheel hub ==
<!-- AR33.20-P-0310I Remove/install front wheel hub 30.10.08
MODEL 211 (except 211.08 /09 /28 /29)
MODEL 215
MODEL 220 (except 220.08 /18)
MODEL 230 except CODE (P99) "AMG Black Series" special model
-->
{|
|
* 023 - Slide hammer puller
* 5a - Stub axle
* 9 - Front wheel hub
* 9d - Clamp nut
* 9e - Hub cover
* 9i - Hexagon socket head screw
* 9m - Outer tapered roller bearing
* 35 - Brake caliper dust shield
|[[File:W220_remove_install_front_wheel_hub.png]]
|}
# Only tighten nuts and bolts of chassis components when vehicle is in a ready-to-drive condition.
# Remove front wheel
# Remove brake disc
# Pull off hub cap (9e)
# Undo hexagon socket head screw (9i), remove clamp nut (9d) and remove outer tapered roller bearing (9m). Installation: Adjust wheel bearing play.
# Pull off front wheel hub cover (9). If the front wheel hub (9) is seized, detach AR33.20-P-0310-01A the front wheel hub (9) using a slide hammer puller (023). Installation: Coat the radial sealing ring with grease and, if necessary, pack the space between the lip and outer tapered roller bearing (9m) with grease. Push the front wheel hub (9) with inner tapered roller bearing and radial sealing ring onto the steering knuckle spindle (5a). Installation: Fill the front wheel hub (9) with grease.
Check:
# Check brake cover plate (35). Replace if necessary. Installation: When using a new brake cover plate (35), ensure that the rubber grommet that seals the wheelspeed sensor socket is pushed onto the wheelspeed sensor.
# Check steering knuckle spindle (5a) for discoloration and wear, and check bearing surface of radial sealing ring. Discoloration can be caused by the excessive heat that can result from incorrect bearing adjustment: Replace stub axle.
# Check front wheel hub (9). Check tapped holes and rotor teeth for damage, and if necessary: Install new front wheel hub (9).
# Check the lateral and radial runout of the front wheel hub (9). If permitted measurements are exceeded: Install new front wheel hub (9).
# Inspecting tapered roller bearing and bearing races. Damaged bearings cannot be replaced ''(actually can)''; if necessary: Install new front wheel hub (9).
# Install in the reverse order
* Front wheel hub flange lateral runout: mm 0.03
* Radial runout on disk wheel alignment fitting of front wheel hub: mm 0.05
=== Inspecting tapered roller bearing and bearing races ===
<!-- AR33.20-P-0310-02I Inspecting tapered roller bearing and bearing races -->
The tapered roller bearings and bearing races can be used again if:
* the tapered rollers and bearing races have a smooth, grey running track
* no discoloration (from severe overheating, etc.) is found.
* the roller cage and the face ends of the tapered rollers are not damaged.
* the bearing races sit tight in the wheel hub.
The tapered roller bearings and bearing races cannot be interchanged. If damage is present, a new front wheel hub must be installed. The replacement front wheel hub is supplied complete with both bearings and sealing ring.
== Wheel bearings ==
{|
|[[File:W220 Front Wheel Bearing Main Parts.JPG|thumb|none|Main parts of front wheel bearing]]
|[[File:W220 Front Wheel Hub Rear View.JPG|thumb|none|Front wheel hub rear view]]
|[[File:W220 Front Wheel Hub Seal and ABS Tone Ring.JPG|thumb|none|ABS slotted disc (also called a tone ring) and the hub seal]]
|}
Issues:
* Bad bearings- need replacement
* Loose bearing nut, need adjustment
* Repacking of bearings
=== Part numbers ===
* Outer wheel bearing: A0029806502
* Inner wheel bearing: A1409810305
Hub seal and ABS wheel speed slotted disc (ABS tone ring):
* A0229979747 (OE) - EUR 40
* FEBI BILSTEIN 24994 - EUR 3
Bearing kits:
* SNR R151.35 - EUR 25
* SKF VKBA3565 - EUR 23
[[File:W220_front_bearing_kit_SNR_R151.35.jpg|thumb|none|SNR Wheel Bearing Kit Front (SNR R151.35)]]
Wheel hub with bearings preinstalled:
* OE A2203300725 (308 EUR)
* FEBI BILSTEIN 30945 (100 EUR)
[[File:W220_FEBI_BILSTEIN_30945_wheel_hub.jpg|thumb|none|FEBI BILSTEIN 30945 wheel hub]]
=== Replacing wheel bearings ===
#Raise car to full height.
#Chock rear wheels
#Loosen front wheel nuts.
#Jack up front of car and place on jack stands.
#Remove front wheel
#Remove brake calliper
#Support calliper to remove strain on abs wheel speed and brake wear sensor cables
#Remove Torx bolt securing brake disc to hub
#Remove brake disc.
#Remove dust cap. (For installation, fill the interior of the dust cap with high temperature wheel bearing grease.  A smear of silicon will also help prevent any grease from leaking out and contaminating the wheel hub cap.)
#Undo Locking bolt on axle nut.
#Remove axle nut (For installation tighten nut and then back off to achieve 10 to 20 micrometres axial play in brake disc as measured by a magnetic base dial gauge clamped to the disc and measuring end of the axle.)
#Remove wheel hub. (If you are lucky the inner bearing and seal will come out with the hub.) (For installation ensure that there is no grease on the ABS tone ring and ensure that the hub is presented to the axle exactly square so that the inner bearing doesn’t cock on the axle shaft.)
#Clean off any remaining grease from axle.
#If necessary use and angle grinder to grind away part of the inner bearing until it is able to be split and removed from the axle.
#Do a final clean-up of the axle. (For installation, thoroughly coat the axle with high temperature wheel bearing grease before installing the hub.)
#Using a hammer and drift, knock off the ABS tone ring.
#Clean-up the wheel up of any old grease. (For installation, fill the interior of the wheel hub with high temperature wheel bearing grease.)
#Using a suitable diameter piece of bar stock, press out the outer bearing.
#Using a suitable diameter piece of bar stock, press out the inner bearing.
#Clean up the wheel hub.
#Pack the new bearings with high temperature wheel bearing grease. (An easy method is to place half a cup of grease in the corner of a plastic bag. Drop in a bearing and kneed thoroughly until the bearing is saturated with grease.)
#[[File:Packing Wheel Bearings with Grease.jpg|thumb|none|Packing wheel bearings with grease]]
#Install in the reverse order and repeat for the other front wheel.
''When hammering in ABS Tone Ring, make sure to not bend the ring otherwise wheel speed sensor will not be able to read the rotation speed.''
{|
|{{#ev:youtube|https://www.youtube.com/watch?v=j_Pu5BNUX5I|320|left|Bearing replacement.|frame}}
|{{#ev:youtube|https://youtu.be/zBpBaqU9kVs|320|center|W220 Front Wheel Hub Re-Haul (By Masood)|frame}}
|}
==== Bearing grease ====
High temperature antifriction bearing grease (NLGI grade 2). Passenger cars: Front wheel hubs
<!-- BB00.40-P-0265-01A -->
Product name (Customer, town/country):
* MB 265.1 Hochtemp-Wälzlagerfett A 002 989 00 51 (Daimler AG, Stuttgart/Germany)
* ARAL Radlagerfett (Aral Aktiengesellschaft, Hamburg, Germany)
* AVIA LITHOPLEX 2 EP (Avia Mineralöl-AG, Munich, Germany)
* Axellence 152 S Green (Axel Christiernsson International, NOL/SWEDEN)
* AXELLENCE 1525 EPS Green (Axel Christiernsson International, NOL/SWEDEN)
* Caltex Delo Grease ESI (Chevron Global Lubricants, GENT/ZWIJNAARDE, BELGIUM)
* Castrol LMX Li-Komplexfett (Castrol Limited, SWINDON, UNITED KINGDOM)
* Chevron Delo Grease ESI (Chevron Global Lubricants, GENT/ZWIJNAARDE, BELGIUM)
* Fuchs Renolit LX-PEP 2 (Fuchs Petrolub AG, Mannheim, Germany)
* Hytex EP 2 LF (Chevron Global Lubricants, GENT/ZWIJNAARDE, BELGIUM)
* KAJO-Wälzlagerfett LC 002 (Kajo-Chemie GmbH, Anröchte, Germany)
* LiLube Plus (SAF Holland GmbH, Aschaffenburg/Germany)
* MOTOREX FETT 3000 (Bucher AG Langenthal, Langenthal, Switzerland)
* RAVENOL Hot Red Grease HRG 2 (Ravensberger Schmierstoffvertrieb GmbH, Werther, Germany)
* Renolit LX-PEP 2 DC (Fuchs Petrolub AG, Mannheim, Germany)
* rhenus LKR 25 (Rhenus Lub. GmbH & Co KG, Mönchengladbach, Germany)
* Siebert high-temperature grease 5611 (Siebert GmbH, Mönchengladbach/Germany)
* Texaco Starplex EP 2 (Chevron Global Lubricants, GENT/ZWIJNAARDE, BELGIUM)
Unlisted products satisfying 265.1 specification:
* FEBI BILSTEIN 21909 (EUR 4)
* SWAG 10 92 1909
[[File:FEBI BILSTEIN 21909.jpg]]
=== Adjust wheel bearing play ===
<!-- AR33.20-P-0300A Adjust wheel bearing play 6.7.10
MODEL 140, 170, 171, 202, 208, 209, 215
MODEL 203 (except 203.08 /09 /28 /29)
MODEL 210 (except 210.08 /28)
MODEL 220 (except 220.08 /18) -->
{|
|
* 015 - Dial indicator holder
* 022 - Dial indicator
* 9d - Clamp nut
* 9e - Hub cover
* 9i - Hexagon socket head screw
* 48a - Wheel bolt
|[[File:W220_Adjust_wheel_bearing_play.png]]
|[[File:W220_adjust_wheel_bearing_play_youtube.jpg|500px]]
|}
Removing:
# Remove front wheel
# Turn-in wheel bolt (48a) opposite from brake rotor attachment bolt (to immobilize brake rotor).
# Press brake pads back into brake caliper
# Pull off hub cap (9e) using removal and installation tool
Checking:
# To set up the wheel bearing loosen hexagon socket bolt (9i) and tighten clamp nut (9d) lightly whilst turning the front wheel hub.
# Mount dial indicator (022) with dial indicator holder (015) on the brake disk
# Adjust wheel bearing play by turning (arrow) the clamping nut (9d) in stages while pushing and pulling the brake disk firmly back and forth. Do not twist or tilt the wheel hub during the measurement. Correct measurement is only possible by pulling and pushing parallel to the wheel axle. Incorrect measurement will result in the set wheel bearing play being too small. This can then lead to wheel bearing damage.
# Tighten the Allen bolt (9i), check the wheel bearing end float again.
# Remove the dial indicator (022) with dial indicator holder (015).
Install:
# Fill hub cap (9e) with high-temperature roller bearing grease.
# Mount hub cover (9e)
# Remove wheel bolt (48a)
# Mount front wheel
* Wheel bearing play at front axle: mm 0.01...0.02
* Filling capacity: Hub cover: g 15, Hub (total capacity): g 95
{|
|{{#ev:youtube|https://www.youtube.com/watch?v=TY0yq7lnrbQ|320|left|Adjusting wheel bearing play (W220).|frame}}
|{{#ev:youtube|https://www.youtube.com/watch?v=VokNRipkvtU|320|left|Adjusting wheel bearing play.|frame}}
|{{#ev:youtube|https://www.youtube.com/watch?v=ddxsWrTWLUI|320|left|How to replace wheel hub and adjust bearings|frame}}
|}
=== Use of aftermarket inner wheel bearings ===
'''WARNING''': Do not use aftermarket inner bearings without carefully checking that they perfectly match a genuine M-B bearing.
In particular notice the shape of the inner shoulder on the inner bearing on the side that is in contact with the axle back flange.  Genuine M-B bearings have a small radiused shoulder.  Some aftermarket bearings have a square shoulder. (The next diagram shows a complete but good M-B inner bearing compared with aq bad inner bearing. Only the race is shown as the bad bearing had to be destroyed by being ground with an angle grinder to produce a wafer thin section to allow it to be removed. See scorch mark where the split occurred.)
{|
|[[File:W220 Front Wheel Inner Bearing Showing Radiused Shoulder.JPG|thumb|none|Inner bearing showing radiused shoulder]]
|[[File:W220 Front Wheel Axle Showing Radiused Edge.JPG|thumb|none|Axle showing radiused edge]]
|}
The radiused shoulder on the inner bearing fits neatly against the radiused edge on the axle flange.  If an inner bearing with a square edge is used it will interfere with this radiused edge and '''the hub will not be in the correct position'''.  The area of interference is shown in the next diagram.
The consequence of using an inner  bearing with a square shoulder is that the wheel hub sits slightly proud by about 1mm to 2mm  when installed on the axle.  This also means that the clearance between the ABS tone ring and the ABS magnetic sensor is increased by the same amount and causes the speed reading sesnor to not work at all or not work properly. The magnetic sensor needs to be in very close proximity to the slotted ABS tone ring to generate adequate speed signals. 
If the car is driven with this situation, after a few minutes, the instrument cluster will show '''ESP Failure''' and '''ABS Failure''' messages along with '''Drive to the nearest workshop''' being indicated.
If the gap is too wide, analysis with Star DAS will show that there is zero or an "implausible" speed signal generated by the front wheel ABS sensor.
The fix is to use genuine inner wheel bearings for the front wheels.
== Wheel speed sensor ==
<!-- GF42.45-P-4550PP Location / task / design / function of wheel speed sensor 20.1.00
MODEL 163 as of 1.9.02, 209, 215, 220 with CODE (472) Electronic Stability Program (ESP)
MODEL 203 with CODE (472) Electronic Stability Program (ESP)
up to Model Year 8 -->
Shown on model 203
{|
|[[File:W220_wheel_speed_sensor.jpg]]
|
* L6/1 Left front wheel speed sensor
* (L6/2) Right front wheelspeed sensor
* L6/3 Left rear wheel speed sensor
* (L6/4) Right rear wheelspeed sensor
|}
The front wheelspeed sensors (L6/1 and L6/2) are mounted on the front steering knuckle assemblies.
The rear wheelspeed sensors (L6/3 and L6/4) are installed on the rear wheel carriers.
It is active sensor consisting of a casing and a sensor element relying on a magnetoresistive effect to monitor rotation rate. The task of the sensor is to supply the current wheel speed to the ESP control module.
<!-- GF42.45-P-4550-02PP Wheel speed sensor, function Models 163, 203, 209, 215, 220 -->
===Function of the active wheel speed sensor===
The diagram shows the current path through
the active wheel speed sensor during an
acceleration phase.
{|
|[[File:W220_wheel_speed_sensor_signal.png]]
|
* 1 - Active sensor
* 2 - Reluctor with mutiple trigger points
* 3 - Sample of signal output from wheelspeed sensor
|}
The strength and direction of an external magnetic field causes a change in the internal resistance inside the sensor. An electronic analysis system accommodated in the sensor produces a square-wave signal, whose frequency is proportional to the rotational speed but whose amplitude is constant. This signal is received by the relevant dynamic handling control system and transmitted over the CAN.
A reluctor with multiple trigger points generates the external magnetic field.
This consists of an elastomer plastic containing metallic particles.
These are aligned by a special magnetization method so as to produce various magnets whose polarity at the circumference alternates from north to south.
=== Parts ===
* A2205400117 (OE) - left/right (~EUR 110).
* FEBI 27857 (~EUR 40)
[[File:W220_front_wheel_speed_sensor.jpg|thumb|none|W220 front wheel speed sensor]]
=== Remove/install left front or right rpm sensor ===
<!-- AR42.30-P-0712I Remove/install left front or right rpm sensor 8.12.11
MODEL 215, 220, 230 -->
Shown on model 220
{|
|[[File:W220_remove_install_front_rpm_sensor_1.jpg]]
|
* 6a - Screw
* L6/1 - Left front rpm sensor
* L6/2 - Right front rpm sensor
* X62/6 - Right front axle multiple circuit junction connector, major assembly compartment
* X62/7 - Left front axle multiple circuit junction connector, major assembly compartment
|}
{|
|[[File:W220_remove_install_front_rpm_sensor_2.jpg]]
|
* 1 - Chafe protection (model 230 without code (P99) Special model "AMG Black Series")
* 2 - Steering knuckle
* L6/1 - Left front rpm sensor
* L6/2 - Right front rpm sensor
|}
Remove/install:
# Remove bolt (6a).
# Take out left front rpm sensor (L6/1) or right front rpm sensor (L6/2). Installation: Apply light coating of grease to bore in steering knuckle (2). Hot lubricating paste.
# Unlock and disconnect left front axle multiple circuit junction connector, major assembly compartment (X62/7) or right front axle multiple circuit junction connector, major assembly compartment (X62/6). Press clip in direction of arrow.
# Install in the reverse order.
# Installation: Ensure that the electrical feed line to the rpm sensor has sufficient play. The vehicle suspension must be able to fully compress and rebound without damaging the feed line. The feed line should not chafe at any point, as this could lead to system failure.
# Installation: Model 230 without code (P99) Special model "AMG Black Series", observe installation position: The chafe protection (1) must be screwed to the front rpm sensor as shown here. It must not be mounted between the rpm sensor and steering knuckle (2).
# Installation: On model 215, 220 check rotor of wheel hub for damage. Pay attention to cleanliness of magnetic tip.
# Connect STAR DIAGNOSIS, read out fault memory and erase if necessary
Torque specification:
* Self-locking bolt, front axle rpm sensor to steering knuckle: 25 Nm
''Front wheel speed sensor can be replaced without removing the wheel. To get access the steering wheel must be turned out as much as possible and [[Airmatic]] raised setting must set.''
{|
|{{#ev:youtube|https://youtu.be/xslAnSERqBI|320|center|W220 Front Wheel Speed Sensor Replacement (By Masood)|frame}}
|}
=== Remove/install left rear or right rpm sensor ===
{|
|{{#ev:youtube|https://www.youtube.com/watch?v=LS80FwpGX5U|320|left|Rear wheel speed sensor replacement.|frame}}
|}
== Remove/install stabilizer bar on front axle ==
{|
|{{#ev:youtube|https://youtu.be/xLv5pzF8Gk4?si=yAyw1JeuJSxCyyQl|320|center|W220 Replace Stabilizer Bar and Link Rods (By Masood)|frame}}
|}
<!-- AR32.20-P-0300I, Remove/install stabilizer bar on front axle, 13.4.11
MODEL 220 (except 220.083 /084 /087 /183 /184 /187) except CODE (487) Active Body Control (ABC) -->
{|
|[[File:W220_replace_stabilizer_bar.jpg|700px|]]
|
* 10 - Stabilizer bar
* 17 - Spring control arm
* 21b - Retaining clip
* 21e - Bolts
* 23 - Link rod
* 23b - Nut
* 23c - Nut
* 23d - Screw
|}
# Raise vehicle with vehicle lift
# Remove bottom engine compartment paneling (vehicles with gasoline engine)
# Remove bottom section of soundproofing (vehicles with disel engine)
# Unscrew nut (23c) and pry link rod (23) off spring control arm (17). Check rubber boot of stabilizer bar pivot bushing in spring control arm (17) for damage and replace stabilizer bar pivot bushing if necessary. If the rubber boot of the stabilizer bar pivot bushing is damaged, the stabilizer bar pivot bushing (and not the spring control arm) has to be replaced. Installation: Press link rod (23) onto hexagon of stabilizer bar pivot bushing in spring control arm (17).
# Remove bolts (21e) and remove retaining bracket (21b). The threaded connection has been changed from M8 to M10. When using new parts the nut M8 possibly fitted in the frame-type integral support is to be replaced by a nut M10. Drill the hole in the frame-type integral support accordingly and protect against corrosion.
# Take off torsion bar (10). Check rubber mount of stabilizer bar (10) for damage and wear and replace stabilizer bar (10) if necessary. The rubber mounts are molded onto the torsion bar (10).
# Unscrew nut (23b) and remove link rod (23) from torsion bar (10). Installation: Tighten nut (23b) only when vehicle is in ready-to-drive condition. To do so, counterhold bolt (23d) with shortened Allen wrench (shop-made). Turn steering if necessary. Check rubber mount of link rod (23) for damage and replace link rod (23) if necessary.
# Install in the reverse order
Torque specifications:
* Nut, link rod to spring control arm: 150 Nm
* Nut, link rod to stabilizer bar: 150 Nm
* Bolt, torsion bar to front end: 40 Nm
== Remove/install front stabilizer bar link rod ==
<!-- AR32.35-P-3328T, Remove/install front stabilizer bar link rod, 2.5.06
MODEL 211 (except 211.08 /09 /28 /29) -->
{|
|[[File:W220_replace_front_stabilizer_bar_link_rod.jpg|500px|]]
|
Shown on left side of vehicle (W211):
* 23 - Link rod
* 23a - Nut
* 23b - Nut
|}
{|
|[[File:W220_stabilizer_link_hex_screw.jpg|thumb|none|Stabilizer screw (hex 11mm)]]
|[[File:W220_11m_allen_hex_wrench_shortened.jpg|thumb|none|Shortened 11mm Allen hex wrench]]
|[[File:W220_unscrewing_stabilizer_bar_counterholding.jpg|thumb|none|Unscrewing nut (23b) by counterholding]]
|}
# Lift vehicle on lifting platform.
# Unscrew nut (23a) of link rod (23) from stabilizer bar pivot bushing. Do not damage rubber boot of stabilizer bar pivot bushing. If damaged, replace stabilizer bar pivot bushing. If the rubber boot of the stabilizer bar pivot bushing is damaged, the stabilizer bar pivot bushing (and not the spring control arm) has to be replaced.
# Unscrew nut (23b) of link rod (23) from stabilizer bar using box wrench bit. To do so, counterhold threaded bolt with shortened Allen ''hex'' wrench ''11mm'' (shop-made). Turn steering if necessary. Installation: Replace self-locking nut (23b).
# Remove link rod (23) of torsion bar. ''This may require jacking up the spring control arm.''
# Install in the reverse order
=== Replacing stabilizer bar bushings ===
Replacing bushings instead of the entire stabilizer will save ~10 EUR per stabilizer.
For pressing bushings in and out, M14 screw with appropriate caps can be used.
* For pressing out: 44/34 pressing cap; 62/52 receiving cap.
* For pressing in: 48/38 pressing cap; 62/52 receiving cap.
{|
|[[File:W220_pressing_out_stailizer_link_bushings.jpg|thumb|none|Pressing out bushings]]
|[[File:W220_stailizer_link_bushings_pressed_out.jpg|thumb|none|Stabilizer link with old and new bushings]]
|[[File:W220_pressing_in_stailizer_link_bushings.jpg|thumb|none|Pressing in bushings]]
|}
== Install new stabilizer bar pivot bushing in spring control arm ==
<!--
AR32.20-P-0310M, Install new stabilizer bar pivot bushing in spring control arm, 13.4.11
MODEL 211 (except 211.08 /09 /28 /29) in the spring control arm
MODEL 220 (except 220.08 /18) except CODE (487) Active Body Control (ABC) in spring control arm
MODEL 230 except CODE (487) Active Body Control (ABC) except CODE (P99) Special model "AMG Black Series"
-->
{|
|[[File:W220_install_stabilizer_bar_pivot_bushing.jpg|600px|]]
|
Shown on model 220:
* 5 - Steering knuckle
* 8 - Stabilizer bar pivot bushing
* 9 - Rubber boot
* 10 - Tie rod
* 17 - Spring control arm
* 18 - Torque strut
* 19 - Rubber boot
* 23 - Link rod
* 23b - Nut
* 23c - Nut
* 23d - Screw
|}
# Remove front wheel
# Detach torque strut (18) from steering knuckle (5). Installation: Replace self-locking nut. Check rubber boot on ball head of torque strut (18) for damage. If rubber boot is damaged, install new torque strut (18).
# Remove track rod (10) from steering knuckle (5). Installation: Replace self-locking nut.
# Loosen nut (23b). To do so, counterhold bolt (23d) with shortened Allen wrench (shop-made). Turn steering if necessary. Installation: Tighten nut (23b) only when vehicle is in ready-to-drive condition.
# Unscrew nut (23c), detach link rod (23) from spring control arm (17) and swing vertically upward. Installation: Press link rod (23) onto hexagon of stabilizer bar pivot bushing (8) on spring control arm (17).
# Remove rubber boot (9) and wire fasteners of torsion bar pivot bushing (8). When pressing out the torsion bar pivot bushing (8) with the rubber boot installed the special tool is damaged due to too high press-out force.
# Press stabilizer bar pivot bushing (8) out of spring control arm (17)
# Checking: Check rubber boot (19) of ball joint in spring control arm (17) for damage. If rubber boot (19) is damaged, install new spring control arm (17).
# Checking: Check rubber mount of spring control arm (17) for damage. Replace rubber mount if necessary.
# Install in the reverse order. Installation: Tighten nuts and bolts of chassis components only when vehicle is in ready-to-drive condition.
=== Press out/press in stabilizer bar pivot bushing ===
<!-- AR32.20-P-0310-01M, Press out/press in stabilizer bar pivot bushing -->
{|
|[[File:W220_stabilizator_pivot_bushing_press1.jpg|500px|]]
|}
{|
|[[File:W220_stabilizator_pivot_bushing_press2.jpg|500px|]]
|}
Pressing out:
# Do not use an impact wrench or other compressed-air tool otherwise the threaded spindle on the puller (2) will be damaged.
# The threaded spindle on puller (2) is only used for retensioning and not for pressing out the stabilizer bar pivot bushing (8).
# It is essential to remove the rubber boot (and its wire fasteners) of the torsion bar pivot bushing (8), otherwise the puller (2) will be damaged as a result of the high press-out forces.
# Press out stabilizer bar pivot bushing (8) with puller (2), press (1), press-out sleeve (2.1) and counterholder (2.3) from the spring control arm (17) opposite to the direction of travel.
# Attach the counterholder (2.3) correctly on the stabilizer bar pivot bushing (8) (see picture). The bore in the counterholder (2.3) must be seated centrally over the stabilizer bar pivot bushing (8). The removal and installation tool 220589074300 contains: Puller (2); Press-out sleeve (2.1); Counterholder (2.3).
Pressing in:
# Clean mounting hole in the spring control arm (17).
# Using puller (2), press (1), press-in sleeve (2.2) and counterholder (2.3) press stabilizer bar pivot bushing (8) into spring control arm (17) in the direction of travel.


==Torque Specifications - Complete Front Axle/Suspension==
==Torque Specifications==
Torque specs for a 2004 S600 (with ABC) are as follows from WIS. According to WIS, these values apply to all W220 and 215 cars with ABC. If your 2003 S600 has ABC, then it is assumed these apply. Do double check though as we will not be held liable for any damages.  
Torque specs for a 2004 S600 (with ABC) are as follows from WIS. According to WIS, these values apply to all W220 and 215 cars with ABC. If your 2003 S600 has ABC, then it is assumed these apply. Do double check though as we will not be held liable for any damages.  
* Tie rod to steering knuckle (spindle) is 50NM then 60 degrees  
* Tie rod to steering knuckle (spindle) is 50NM then 60 degrees  

Latest revision as of 00:19, 2 May 2024

Parts

Steering knuckle and control arm-related parts in EPC
Torsion bar front related parts in EPC
W220 Front Suspension Part Numbers
Item no. Part number Designation/description Quantity
5 A2203303720 STEERING KNUCKLE LEFT. Code: -Z04 (also known as spindle or hub)
steering knuckle
 001
5 A2203303820 STEERING KNUCKLE RIGHT Code: -Z04 001
10 A2203330727

LEMFORDER 3377301 (EUR 20)

JOINT (left and right)
Ball Joint Steering Knuckle to Lower Control Arm
 001
15 A2203300725 FRONT WHEEL HUB WITH BEARING 002
16 A0029806502 TAPERED ROLLER BEARING. WHEEL HUB, OUTSIDE. Code: -Z07 002
16 A1409810305 TAPERED ROLLER BEARING. WHEEL HUB, INSIDE. Code: -Z07 001
16 A1409810305 TAPERED ROLLER BEARING. WHEEL HUB, INSIDE 001
17 A0229979747 SEAL RING. WHEEL HUB. Code: -Z07 001
17 A0229979747 SEAL RING. WHEEL HUB 001
25 A1163340372 NUT FRONT WHEEL HUB TO STEERING KNUCKLE 002
25 A2203201689 (left)

LEMFÖRDER 29311 01 (15 EUR)

ROD AT TORSION BAR LEFT. Code: -487 (also called sway bar link / stabilizer link)
Stabilizer link (left)
Stabilizer link bushing (LEMFÖRDER 2721801 (6 EUR))
 001
25 A2203201589 (right)

LEMFÖRDER 29310 01 (15 EUR)

ROD AT TORSION BAR RIGHT. Code: -487
Stabilizer link (right)
Stabilizer link bushing (LEMFÖRDER 2721801 (6 EUR))
 001
30 N000000003358 HEXALOBULAR BOLT FRONT WHEEL HUB TO STEERING KNUCKLE M6X25 002
35 A1683570089 PLUG FRONT WHEEL HUB TO STEERING KNUCKLE 002
40 A2203308907

LEMFORDER 3442101 (EUR 50)

TRANSVERSE CONTROL ARM BOTTOM LEFT Code: -487-Z07 (also known as spring control arm or lower control arm)
lower control arm (right and left)
Rear view of lower control arm
Front view of lower control arm
 001
40 A2203309007

LEMFORDER 3442201(EUR 50)

TRANSVERSE CONTROL ARM BOTTOM RIGHT Code: -487-Z07 001
45 A2203309107 TS SPRING LINK PARTS KIT LEFT AND RIGHT Code: -Z07. [408] ONLY REPLACEABLE BY PAIRS 002
46 A2203333114 BEARING SPRING CONTROL ARM. Code: -Z07 002
47 A2113230068

LEMFORDER 2166702 (13 EUR)

Stabilizer bar pivot bushing for lower control arm (left and right)

002
50 A2203330071 BOLT SPRING CONTROL ARM AT FRAME M14X1.5 002
50 A2203330171 FITTED BOLT FOR ADJUSTING WORK ONLY M14X1.5 002
55 A2203330076 SHIM SPRING CONTROL ARM AT FRAME 004
60 N000000003281

FEBI BILSTEIN 23696 (1 EUR)

HEXAGON NUT SPRING CONTROL ARM AT FRAME M14X1,5

002
64 N000000003281 HEXAGON NUT SPRING LINK ON SUPPORTING JOINT M14X1,5 002
65 A2203305711

LEMFORDER 3123501 (EUR 72)

STRUT LEFT (also called Thrust Arm or Torque Strut)
Thrust arm (right and left)
Thrust arm
 001
65 A2203305811

LEMFORDER 3123601 (EUR 72)

STRUT RIGHT 001
70 A2203330071 BOLT STRUT AT FRAME M14X1.5 002
70 A2203330171 FITTED BOLT FOR ADJUSTING WORK ONLY M14X1.5 002
75 A2203330076 SHIM STRUT AT FRAME 004
80 N000000003281 HEXAGON NUT STRUT AT FRAME M14X1,5 002
84 N000000003281 HEXAGON NUT STRUT TO STEERING KNUCKLE M14X1,5 002
85 A2203309307

LEMFORDER 2099202 (EUR 120)

TRANSVERSE CONTROL ARM TOP, LEFT (also called Upper Control Arm - UCA)
Transverse control arm top (right and left)
Transverse control arm
 001
85 A2203309407

LEMFORDER 2099302 (EUR 120)

TRANSVERSE CONTROL ARM TOP, RIGHT 001
90 A0049908104 BOLT UPPER CONTROL ARM TO FRAME M10X95 004
95 N913023010002 NUT UPPER CONTROL ARM TO FRAME M10 004
100 N910113010000 HEXAGON NUT UPPER TRANSVERSE CONTROL ARM TO STEERING KNUCKLE M10 002
110 A0003300018 TS BOLT PARTS KIT FOR ADJUSTING WORK ONLY 004

Steering-related parts (e.g., tie rod) are described in steering linkage page.

Common issues with the front axle/suspension are:

  • Front tyre/s wearing unevenly.
  • Front suspension making a creaking sound at low speed indicating possible ball joint failure.
  • Looseness indicated by excess movement in ball joint/s. I.e., it feels worn and not firm in its socket.
  • Cracks in the control arm (Item 85) bushings and ball joints.
Cracks in the control arm bushings.

If you experience any of the above issues, the following parts are the ones that often need replacing due to wear after about 130,000 Km (80,000 miles).

  • The front rear lower control arms (shock mount control arms) are not a "must replace" item. If your car has higher miles (80k+), then it would be a good idea to replace them as well. The outer end of the arm can be quite tricky to force off the ball joint at the knuckle (spindle).
  • The thrust arms (torque arms) wear out faster, as they take the brunt force of the vehicle under braking. Once you pull out the thrust arms, take a look at the chassis side joint. If the rubber has clearly failed (lots of cracks), then it may be a good idea to change the shock control arms as well.

Tips for DIY repairs

  • Make absolutely certain that the car is properly and safely supported. You will be pulling and pushing hard on the car while you are under it.
  • It might be helpful to kept all new parts in the freezer for a few days to shrink them before assembly because the fit tolerances are so tight. Remove each part from the freezer until just prior to installing the part.
  • Make sure to soak all the bolt/nuts a few hours before you start work with PB blaster or Penetrene.
  • In hindsight, it is useful to replaced both the strut (also called Thrust Arm or Torque Strut) and control arms (upper control arm and lower control arm) at the same time because they have similar bushings that undergo the same service environment. Additionally, if doing both control arms, for easier access to a ball joint and ease reinstallation it is helpful to completely remove the Steering Knuckle (also called spindle or hub).
  • Take your time disconnecting and reconnecting any of the electrical connectors in the area - its easy to mess these up. Use some masking tape to mark the connections.
  • Once the car is jacked up and the wheels removed, release the air pressure on the top of the shock. With the key off, and the vehicle raised up, crack open the fitting at the top of the airmatic strut. Be careful not to allow any dirt in the system. Once everything is connected back up it will just fill back up once the car is turned on.
  • When using the Ball Joint Separator tool (and you have a lot of free time), tighten it, walk away. Come back a few hours later, tighten it a little more and walkway. Repeat the steps. The ball joint normally breaks loose due to tension. If you are lucky it will let go after about 30-40 minutes.
  • Use a hot air dryer on each stuck nut for about five mins each and they come out easy, the heat breaks down the lock-tight bond.
  • The 5mm Alan has blue Loctite from the factory and normally requires an impact grade driver to remove. If you end up rounding the Alan out, (which can easily happen) then the drill must come out and carefully drill out the set screw. Here's how to remove them using a a miniature butane torch [1]
  • Good website for more tips on how to get set screws out and ball joints separated. [2]
  • If you are doing this DIY with a jack and stands the easiest way is to remove the Steering Knuckle (also called spindle or hub) with the arms attached after removing the brake caliper. Just remove the tie rod end from the knuckle then disconnect the strut from the control arm, followed by releasing the upper control arm from the knuckle then control arms from the chassis. This way it is a lot easier to remove the arms from the knuckle on a work-bench.
  • Removing the Steering Knuckle (also called spindle or hub) as a first step really frees up the area for further work. Please note that it is essential to use a 5mm hex key to hold the center stud from turning when removing the 21mm nut at the wheel hub. A long handled key with a Blackhawk brand 21mm ratcheting closed end wrench is useful.
  • After strut replacement the correct procedure is to do a ride height adjustment using M-B's Star Diagnosis System (SDS) and then a four wheel alignment, failure to do so will result in bad tyre wear. (not verified)
  • As long as you do not extend or shorten the Tie-Rod, from the inner tie rod, after it is disconnected from the steering knuckle, there is no need for alignment. So, leave the Tie-rod alone after you separate it from the knuckle.
  • When you are done with repair, put the wheels on and carefully lower the vehicle back down with the weight of the car resting on the suspension. THEN, tighten the airmatic fittings and turn the car on. The vehicle should return back to its normal height. Only tighten the lower control arm bolt to the vehicle fitting with the vehicle weight fully on the wheels (or lower the car onto car ramps), as this will prevent the rubber from being torqued and tearing in the lower control arm.

Special Tools Required

Special Tools

How to Replace Front Lower Control Arm Bushings

http://www.benzworld.org/forums/w220-s-class/1810897-02-s500-lower-control-arm-bushings.html

Fitted Bolt

The Transverse Control Arm and Thrust Arm uses standard bolt A2203330071 fitted at factory. After an accident or through years of heavy use the chassis of the vehicle deforms which causes problems for suspension geometry adjustment. For more flexible suspension adjustment a fitted bolt A2203330171 can be installed. See wheel alignment.

Fitted bolt (A2203330171)

Replace supporting joint

  • 5 - Steering knuckle
  • 7 - Support joint
  1. Remove steering knuckle (5)
  2. Check supporting joint (7)
  3. Press supporting joint (7) out of steering knuckle (5)
  4. Install in the reverse order

The ball joint can be replaced without removing the steering knuckle (only by disconnecting the upper control arm).

Replacing support joint without removing steering knuckle:

  1. Jack up side of the car
  2. Remove wheel
  3. Disconnect upper control arm
  4. Tilt the steering knuckle; unscrew ball joint nut; remove spring control arm from ball joint
  5. Reconnect upper control arm (tighten nut only lightly)
  6. Turn steering wheel to obtain maximum toe in
  7. Press out old ball joint; press new one in
  8. Turn steering wheel back to center
  9. Disconnect upper control arm
  10. Tilt the steering knuckle; reattach spring control arm; tighten ball joint nut
  11. Reconnect upper control arm and tighten nut
Load video
YouTube
Pressing out supporting joint.
Load video
YouTube
Pressing out supporting joint.
Load video
YouTube
Replacing lower ball joint.

This video shows in detail how to replace the Ball Joint outside of the car (with the steering knuckle removed from the car):

Load video
YouTube
Replace Lower Ball Joint (By Masood)
Pressing in the ball join

http://www.benzworld.org/forums/w220-s-class/1519699-w220-ball-joint-replacement-diy-tutorial.html

Remove/install torque strut at front axle

  • 5 - Steering knuckle
  • 18 - Torque strut
  • 18a - Screw
  • 18b - Nut
  • 18c - Nut
  • 18d - Rubber bushing
  1. Lift vehicle on lifting platform.
  2. Remove front wheel
  3. Press radius rod (18) out of steering knuckle. Installation: Replace self-locking nut (18b).
  4. Detach front engine compartment paneling from the inner paneling of the fender
  5. Swing back the inner paneling of the fender
  6. Unscrew nut (18c), pull out bolt (18a) and remove strut rod (18) from front axle carrier.
  7. If repair kit installed: The bolt (18a) may not be twisted. Always counterhold bolt (18a) when loosening or tightening nut (18c), otherwise the lock tabs for caster adjustment in the rubber mount (18d) will be sheared off.
  8. Installation: Screw on nut (18c) of bolt (18a) until it abuts, however do not tighten yet so that the rubber mount (18d) of the strut rod (18) can twist when the vehicle is rocked to settle the suspension. Tighten nut (18c) with the vehicle in curb position.
  9. Check rubber boot on ball joint of torque strut (18) for damage. If damaged the strut rod (18) should be replaced.
  10. Check rubber mount (18d) of torque strut (18) for damage. If damaged the strut rod (18) should be replaced.
  11. Install in the reverse order. Installation: Only tighten nuts (18b, 18c) in the ready-to-drive condition.

Torque specifications:

  • Self-locking nut, torque strut to front axle carrier: Stage 1: Nm 80, Stage 2: Angle 120.
  • Self-locking nut, radius rod to steering knuckle: Stage 1: Nm 50, Stage 2: Angle 60.
Load video
YouTube
Torque strut replacement.

Remove/install spring control arm on front axle

  • 5 - Steering knuckle
  • 18 - Torque strut
  • 18b - Nut
Shown on spring control arm without thrust plates:
  • 17 - Spring control arm
  • 17a - Screw
  • 17b - Self-locking nut
  • 17c - Nut
  • 23 - Link rod
  • 23c - Nut
  • 40 - Suspension strut
  • 40c - Bolts

Remove/install:

  1. Raise vehicle with vehicle lift
  2. Remove front wheel
  3. Detach torque strut (18) from steering knuckle (5). Installation: Install new nut (18b). Check rubber boot on ball head of torque strut (18) for damage. If rubber boot is damaged, install new torque strut (18). Alternatively, it might be easier to detach upper control arm from steering knuckle.
  4. Vehicles with AIRmatic (semi-active air suspension), code 489: Unscrew nut (23c) and pry link rod (23) off spring control arm (17). Installation: Press link rod (23) onto hexagon of stabilizer bar pivot bushing at spring control arm (17). Check rubber boot of stabilizer bar pivot bushing of link rod (23) at spring control arm (17) for damage, install new stabilizer bar pivot bushing if necessary.
  5. Remove bolts (40c) from spring strut (40). Installation: After tightening the bolts (40c) must be flush with the suspension strut (40) or slightly recessed.
  6. Using a suitable lever, loosen spring strut (40) at ball joint. Check rubber boot of ball joint for damage and install new spring control arm (17) if necessary.
  7. Press spring control arm (17) out of steering knuckle (5). Installation: Replace self-locking nut (17b).
  8. Vehicles with Active Body Control (ABC) (option code 487 - ABC SUSPENSION (ACTIVE BODY CONTROL)), when removing right spring control arm (17). Remove the pressure-supply circuit's valve body from the right side of the front subframe and tie it to one side.
  9. Remove spring control arm (17) from front subframe. Do not twist bolt (17a). Always counter the bolt (17a) when slackening the nut (17c), otherwise the locating tabs for camber adjustment in the rubber bushing of spring control arm (17) will be sheared off. Installation: Screw nut (17c) all the way onto bolt (17a) but do not tighten, so that the rubber bushing of spring control arm (17) can turn when the suspension is compressed. Do not tighten nut (17c) until in ready-to-drive condition.
  10. Install in the reverse order
  11. Perform wheel alignment check

Torque specifications:

  • Front axle stabilizer bar, Nut, link rod to spring control arm: 150 Nm
  • Suspension struts, Bolt, front suspension strut to spring control arm: 20 Nm
  • Wheel location, hub: Self-locking nut, track control arm to stub axle: Stage 1: 50 Nm, Stage 2: 60°
  • Wheel location, hub: Self-locking nut, spring control arm to front axle carrier: Stage 1: 80 Nm, Stage 2: 120°
Load video
YouTube
Replace L Control Arm and Torque Strut (By Masood)

Remove/install steering knuckle

  • 5 - Steering knuckle
  • 8 - Follower joint
  • 10a - Tie rod joint
  • 17 - Spring control arm
  • 18 - Torque strut
  • L6/1 - Left front rpm sensor
  1. Remove front wheel
  2. Remove brake disc
  3. Remove front wheel hub (actually not needed)
  4. Detach brake cover plate
  5. Detach left front rpm sensor (L6/1) from steering knuckle (5)
  6. Press tie rod joint (10a) out of steering knuckle (5)
  7. Press follower joint (8) out of steering knuckle (5)
  8. Press radius rod (18) out of steering knuckle (5). Do not detach torque strut (18) from the front axle carrier.
  9. Press spring control arm (17) out of steering knuckle (5). Do not detach spring control arm (17) from the front axle carrier.
  10. Check supporting joint
  11. Install in the reverse order
  12. Before starting engine, actuate brake pedal several times until the pressure is built up and maintained in the brake system.
  13. Only tighten nuts and bolts of chassis components when vehicle is in a ready-to-drive condition.

Torque specifications:

  • Self-locking nut, track control arm to stub axle: Stage 1: Nm 50, Stage 2: ° 60.
  • Self-locking nut, radius rod to steering knuckle: Stage 1: Nm 50, Stage 2: ° 60.
  • Self-locking nut, upper wishbone follower joint to steering knuckle: Stage 1: Nm 20, Stage 2: ° 90.
  • Self-locking bolt, front axle rpm sensor to steering knuckle: Nm 25
  • Self-locking nut, tie rod to steering knuckle: Stage 1: Nm 50, Stage 2: ° 60
  • Bolt brake cover plate to steering knuckle / wheel carrier: M6 Nm 10

Inspect front axle joint for play, inspect rubber boots

  • 5 - Steering knuckle
  • 7f - Rubber boot
  • 17 - Spring control arm
  • 18 - Torque strut
  • 18f - Rubber boot
  1. Check rubber boot (7f) on supporting joint for leakage and condition. If the rubber boot (7f) is leaky, replace supporting ball joint (7) or lower control arm.
  2. Check front axle supporting joints
  3. Check rubber boot (18f) on ball joint of torque strut (18) for leaktightness and condition. If the rubber boot (18f) is leaky, replace strut rod (18).
  4. Check rubber boot on follower joint for leakage and condition. If rubber boot is leaky (e.g. grease escape) replace upper transverse control arm or upper ball joint.
  5. Check follower joint for play. If there is play in the upper ball joint, replace upper transverse control arm or upper ball joint.

Checking supporting joint and follower joint of steering knuckle mount (removed)

  • 7f - Supporting joint rubber boot
  • 8f - Follower joint rubber boot
  1. Move the ball pin in all directions with an approximately 150 mm long pipe. The ball pin should move without play (without seizing), and should not cause any creaking noise.
  2. Check rubber boot (7f) on supporting joint for cracks and damage. Replace supporting joint if necessary.
  3. Check rubber boot (8f) on follower joint for cracks and damage. If necessary, replace follower joint or upper transverse control arm. For upper transverse control arms made of die-cast aluminum the upper transverse control arms must be replaced. For upper transverse control arms made of sheet metal aluminum the follower joint must be replaced.

Checking follower joint of steering knuckle mount (installed)

  • 6 - Upper transverse control arm
  • 8f - Rubber boot
  1. Raise vehicle with lifting platform
  2. Check rubber boot (8f) for signs of cracks and damage and, if necessary, replace upper transverse control arm or follower joint. For upper transverse control arms made of die-cast aluminum the upper transverse control arms must be replaced. For upper transverse control arms made of sheet metal aluminum the follower joint must be replaced.
  3. Check play of follower joint and, if necessary, replace upper transverse control arm or follower joint. Feel the ball joint for signs of play while forcefully pushing and pulling the front wheel. For upper transverse control arms made of die-cast aluminum the upper transverse control arms must be replaced. For upper transverse control arms made of sheet metal aluminum the follower joint must be replaced.
  4. Check rubber boot (8f) for leaktightness and condition. If rubber boot is leaking (e.g. grease leaking out) install new upper transverse control arm (6).

Check front axle supporting joints

  • 7 - Support joint
  1. Check rubber boot of supporting joint (7) for cracks and damage
  2. Check play in supporting joint (7).
  3. With pit or drive-on platform with guard edge check play by moving the front wheel up and down.
    1. Checking by hand: Replace supporting joint if play is perceptible.
    2. Checking with dial indicator: Replace supporting joint if play > 0.6 mm.
  4. On vehicle lift check play by moving the front wheel up and down while simultaneously feeling the supporting joint (an assistant is required). Replace supporting joint if play is perceptible.

Remove/install upper control arm

  1. Remove front wheel
  2. Separate plug connection from level sensor.
  3. Detach link rod (arrow) from level sensor on the upper transverse control arm (6)
  4. Press follower joint (8) out of steering knuckle (5)
  5. Secure steering knuckle (5) with wire to prevent it from swinging away
  6. When removing the right upper transverse control arm, detach coolant expansion reservoir and put to one side. Do not detach the coolant hoses.
  7. Remove upper control arm (6) from frame. Installation: Do not tighten nuts until vehicle is ready to roll. Counterhold nut with suitable box wrench.
  8. Check follower joint
  9. Install in the reverse order

Torque specifications:

  • Self-locking nut of upper wishbone on front end: Nm 50
  • Self-locking nut, upper wishbone follower joint to steering knuckle: Stage 1: Nm 20, Stage 2: ° 90
  • Nut, level sensor link rod to upper control arm: Nm 10
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Automotive Front Suspension Ball Joint Removal Tip
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2002 S430 front right upper control arm removal
Detaching level sensor and ball joint
Bolt attaching the left-side upper control arm (1)
Bolt attaching the left-side upper control arm (2)
Bolt attaching the right-side upper control arm (1)
Bolt attaching the right-side upper control arm (2)

Replacing bushings for upper control arm

MB is not selling bushings for upper control arm separately. However, FAG is selling bushing under a part number 829026210 (10 EUR).

Pushing out the original LEMFÖRDER bushing is quite easy as the compression range for the bushing is just a few millimeters. FAG bushing has a much larger compression range (see below).

In practice, it is unlikely that bushing replacement would be useful, because the ball joint (which cannot be replaced) usually goes out of order sooner than the rubber bushings.

LEMFÖRDER bushing vs FAG bushing
Compression startpoint for LEMFÖRDER bushing
Compression startpoint for FAG bushing
Pushing out bushing
Compressing in bushing

Remove/install front wheel hub

  • 023 - Slide hammer puller
  • 5a - Stub axle
  • 9 - Front wheel hub
  • 9d - Clamp nut
  • 9e - Hub cover
  • 9i - Hexagon socket head screw
  • 9m - Outer tapered roller bearing
  • 35 - Brake caliper dust shield
  1. Only tighten nuts and bolts of chassis components when vehicle is in a ready-to-drive condition.
  2. Remove front wheel
  3. Remove brake disc
  4. Pull off hub cap (9e)
  5. Undo hexagon socket head screw (9i), remove clamp nut (9d) and remove outer tapered roller bearing (9m). Installation: Adjust wheel bearing play.
  6. Pull off front wheel hub cover (9). If the front wheel hub (9) is seized, detach AR33.20-P-0310-01A the front wheel hub (9) using a slide hammer puller (023). Installation: Coat the radial sealing ring with grease and, if necessary, pack the space between the lip and outer tapered roller bearing (9m) with grease. Push the front wheel hub (9) with inner tapered roller bearing and radial sealing ring onto the steering knuckle spindle (5a). Installation: Fill the front wheel hub (9) with grease.

Check:

  1. Check brake cover plate (35). Replace if necessary. Installation: When using a new brake cover plate (35), ensure that the rubber grommet that seals the wheelspeed sensor socket is pushed onto the wheelspeed sensor.
  2. Check steering knuckle spindle (5a) for discoloration and wear, and check bearing surface of radial sealing ring. Discoloration can be caused by the excessive heat that can result from incorrect bearing adjustment: Replace stub axle.
  3. Check front wheel hub (9). Check tapped holes and rotor teeth for damage, and if necessary: Install new front wheel hub (9).
  4. Check the lateral and radial runout of the front wheel hub (9). If permitted measurements are exceeded: Install new front wheel hub (9).
  5. Inspecting tapered roller bearing and bearing races. Damaged bearings cannot be replaced (actually can); if necessary: Install new front wheel hub (9).
  6. Install in the reverse order
  • Front wheel hub flange lateral runout: mm 0.03
  • Radial runout on disk wheel alignment fitting of front wheel hub: mm 0.05

Inspecting tapered roller bearing and bearing races

The tapered roller bearings and bearing races can be used again if:

  • the tapered rollers and bearing races have a smooth, grey running track
  • no discoloration (from severe overheating, etc.) is found.
  • the roller cage and the face ends of the tapered rollers are not damaged.
  • the bearing races sit tight in the wheel hub.

The tapered roller bearings and bearing races cannot be interchanged. If damage is present, a new front wheel hub must be installed. The replacement front wheel hub is supplied complete with both bearings and sealing ring.

Wheel bearings

Main parts of front wheel bearing
Front wheel hub rear view
ABS slotted disc (also called a tone ring) and the hub seal

Issues:

  • Bad bearings- need replacement
  • Loose bearing nut, need adjustment
  • Repacking of bearings

Part numbers

  • Outer wheel bearing: A0029806502
  • Inner wheel bearing: A1409810305

Hub seal and ABS wheel speed slotted disc (ABS tone ring):

  • A0229979747 (OE) - EUR 40
  • FEBI BILSTEIN 24994 - EUR 3

Bearing kits:

  • SNR R151.35 - EUR 25
  • SKF VKBA3565 - EUR 23
SNR Wheel Bearing Kit Front (SNR R151.35)

Wheel hub with bearings preinstalled:

  • OE A2203300725 (308 EUR)
  • FEBI BILSTEIN 30945 (100 EUR)
FEBI BILSTEIN 30945 wheel hub

Replacing wheel bearings

  1. Raise car to full height.
  2. Chock rear wheels
  3. Loosen front wheel nuts.
  4. Jack up front of car and place on jack stands.
  5. Remove front wheel
  6. Remove brake calliper
  7. Support calliper to remove strain on abs wheel speed and brake wear sensor cables
  8. Remove Torx bolt securing brake disc to hub
  9. Remove brake disc.
  10. Remove dust cap. (For installation, fill the interior of the dust cap with high temperature wheel bearing grease. A smear of silicon will also help prevent any grease from leaking out and contaminating the wheel hub cap.)
  11. Undo Locking bolt on axle nut.
  12. Remove axle nut (For installation tighten nut and then back off to achieve 10 to 20 micrometres axial play in brake disc as measured by a magnetic base dial gauge clamped to the disc and measuring end of the axle.)
  13. Remove wheel hub. (If you are lucky the inner bearing and seal will come out with the hub.) (For installation ensure that there is no grease on the ABS tone ring and ensure that the hub is presented to the axle exactly square so that the inner bearing doesn’t cock on the axle shaft.)
  14. Clean off any remaining grease from axle.
  15. If necessary use and angle grinder to grind away part of the inner bearing until it is able to be split and removed from the axle.
  16. Do a final clean-up of the axle. (For installation, thoroughly coat the axle with high temperature wheel bearing grease before installing the hub.)
  17. Using a hammer and drift, knock off the ABS tone ring.
  18. Clean-up the wheel up of any old grease. (For installation, fill the interior of the wheel hub with high temperature wheel bearing grease.)
  19. Using a suitable diameter piece of bar stock, press out the outer bearing.
  20. Using a suitable diameter piece of bar stock, press out the inner bearing.
  21. Clean up the wheel hub.
  22. Pack the new bearings with high temperature wheel bearing grease. (An easy method is to place half a cup of grease in the corner of a plastic bag. Drop in a bearing and kneed thoroughly until the bearing is saturated with grease.)
  23. Packing wheel bearings with grease
  24. Install in the reverse order and repeat for the other front wheel.

When hammering in ABS Tone Ring, make sure to not bend the ring otherwise wheel speed sensor will not be able to read the rotation speed.

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Bearing replacement.
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W220 Front Wheel Hub Re-Haul (By Masood)

Bearing grease

High temperature antifriction bearing grease (NLGI grade 2). Passenger cars: Front wheel hubs

Product name (Customer, town/country):

  • MB 265.1 Hochtemp-Wälzlagerfett A 002 989 00 51 (Daimler AG, Stuttgart/Germany)
  • ARAL Radlagerfett (Aral Aktiengesellschaft, Hamburg, Germany)
  • AVIA LITHOPLEX 2 EP (Avia Mineralöl-AG, Munich, Germany)
  • Axellence 152 S Green (Axel Christiernsson International, NOL/SWEDEN)
  • AXELLENCE 1525 EPS Green (Axel Christiernsson International, NOL/SWEDEN)
  • Caltex Delo Grease ESI (Chevron Global Lubricants, GENT/ZWIJNAARDE, BELGIUM)
  • Castrol LMX Li-Komplexfett (Castrol Limited, SWINDON, UNITED KINGDOM)
  • Chevron Delo Grease ESI (Chevron Global Lubricants, GENT/ZWIJNAARDE, BELGIUM)
  • Fuchs Renolit LX-PEP 2 (Fuchs Petrolub AG, Mannheim, Germany)
  • Hytex EP 2 LF (Chevron Global Lubricants, GENT/ZWIJNAARDE, BELGIUM)
  • KAJO-Wälzlagerfett LC 002 (Kajo-Chemie GmbH, Anröchte, Germany)
  • LiLube Plus (SAF Holland GmbH, Aschaffenburg/Germany)
  • MOTOREX FETT 3000 (Bucher AG Langenthal, Langenthal, Switzerland)
  • RAVENOL Hot Red Grease HRG 2 (Ravensberger Schmierstoffvertrieb GmbH, Werther, Germany)
  • Renolit LX-PEP 2 DC (Fuchs Petrolub AG, Mannheim, Germany)
  • rhenus LKR 25 (Rhenus Lub. GmbH & Co KG, Mönchengladbach, Germany)
  • Siebert high-temperature grease 5611 (Siebert GmbH, Mönchengladbach/Germany)
  • Texaco Starplex EP 2 (Chevron Global Lubricants, GENT/ZWIJNAARDE, BELGIUM)

Unlisted products satisfying 265.1 specification:

  • FEBI BILSTEIN 21909 (EUR 4)
  • SWAG 10 92 1909

Adjust wheel bearing play

  • 015 - Dial indicator holder
  • 022 - Dial indicator
  • 9d - Clamp nut
  • 9e - Hub cover
  • 9i - Hexagon socket head screw
  • 48a - Wheel bolt

Removing:

  1. Remove front wheel
  2. Turn-in wheel bolt (48a) opposite from brake rotor attachment bolt (to immobilize brake rotor).
  3. Press brake pads back into brake caliper
  4. Pull off hub cap (9e) using removal and installation tool

Checking:

  1. To set up the wheel bearing loosen hexagon socket bolt (9i) and tighten clamp nut (9d) lightly whilst turning the front wheel hub.
  2. Mount dial indicator (022) with dial indicator holder (015) on the brake disk
  3. Adjust wheel bearing play by turning (arrow) the clamping nut (9d) in stages while pushing and pulling the brake disk firmly back and forth. Do not twist or tilt the wheel hub during the measurement. Correct measurement is only possible by pulling and pushing parallel to the wheel axle. Incorrect measurement will result in the set wheel bearing play being too small. This can then lead to wheel bearing damage.
  4. Tighten the Allen bolt (9i), check the wheel bearing end float again.
  5. Remove the dial indicator (022) with dial indicator holder (015).

Install:

  1. Fill hub cap (9e) with high-temperature roller bearing grease.
  2. Mount hub cover (9e)
  3. Remove wheel bolt (48a)
  4. Mount front wheel
  • Wheel bearing play at front axle: mm 0.01...0.02
  • Filling capacity: Hub cover: g 15, Hub (total capacity): g 95
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Adjusting wheel bearing play (W220).
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Adjusting wheel bearing play.
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How to replace wheel hub and adjust bearings

Use of aftermarket inner wheel bearings

WARNING: Do not use aftermarket inner bearings without carefully checking that they perfectly match a genuine M-B bearing.

In particular notice the shape of the inner shoulder on the inner bearing on the side that is in contact with the axle back flange. Genuine M-B bearings have a small radiused shoulder. Some aftermarket bearings have a square shoulder. (The next diagram shows a complete but good M-B inner bearing compared with aq bad inner bearing. Only the race is shown as the bad bearing had to be destroyed by being ground with an angle grinder to produce a wafer thin section to allow it to be removed. See scorch mark where the split occurred.)

Inner bearing showing radiused shoulder
Axle showing radiused edge

The radiused shoulder on the inner bearing fits neatly against the radiused edge on the axle flange. If an inner bearing with a square edge is used it will interfere with this radiused edge and the hub will not be in the correct position. The area of interference is shown in the next diagram.

The consequence of using an inner bearing with a square shoulder is that the wheel hub sits slightly proud by about 1mm to 2mm when installed on the axle. This also means that the clearance between the ABS tone ring and the ABS magnetic sensor is increased by the same amount and causes the speed reading sesnor to not work at all or not work properly. The magnetic sensor needs to be in very close proximity to the slotted ABS tone ring to generate adequate speed signals.

If the car is driven with this situation, after a few minutes, the instrument cluster will show ESP Failure and ABS Failure messages along with Drive to the nearest workshop being indicated.

If the gap is too wide, analysis with Star DAS will show that there is zero or an "implausible" speed signal generated by the front wheel ABS sensor.

The fix is to use genuine inner wheel bearings for the front wheels.

Wheel speed sensor

Shown on model 203

  • L6/1 Left front wheel speed sensor
  • (L6/2) Right front wheelspeed sensor
  • L6/3 Left rear wheel speed sensor
  • (L6/4) Right rear wheelspeed sensor

The front wheelspeed sensors (L6/1 and L6/2) are mounted on the front steering knuckle assemblies. The rear wheelspeed sensors (L6/3 and L6/4) are installed on the rear wheel carriers.

It is active sensor consisting of a casing and a sensor element relying on a magnetoresistive effect to monitor rotation rate. The task of the sensor is to supply the current wheel speed to the ESP control module.

Function of the active wheel speed sensor

The diagram shows the current path through the active wheel speed sensor during an acceleration phase.

  • 1 - Active sensor
  • 2 - Reluctor with mutiple trigger points
  • 3 - Sample of signal output from wheelspeed sensor

The strength and direction of an external magnetic field causes a change in the internal resistance inside the sensor. An electronic analysis system accommodated in the sensor produces a square-wave signal, whose frequency is proportional to the rotational speed but whose amplitude is constant. This signal is received by the relevant dynamic handling control system and transmitted over the CAN.

A reluctor with multiple trigger points generates the external magnetic field. This consists of an elastomer plastic containing metallic particles. These are aligned by a special magnetization method so as to produce various magnets whose polarity at the circumference alternates from north to south.

Parts

  • A2205400117 (OE) - left/right (~EUR 110).
  • FEBI 27857 (~EUR 40)
W220 front wheel speed sensor

Remove/install left front or right rpm sensor

Shown on model 220

  • 6a - Screw
  • L6/1 - Left front rpm sensor
  • L6/2 - Right front rpm sensor
  • X62/6 - Right front axle multiple circuit junction connector, major assembly compartment
  • X62/7 - Left front axle multiple circuit junction connector, major assembly compartment
  • 1 - Chafe protection (model 230 without code (P99) Special model "AMG Black Series")
  • 2 - Steering knuckle
  • L6/1 - Left front rpm sensor
  • L6/2 - Right front rpm sensor

Remove/install:

  1. Remove bolt (6a).
  2. Take out left front rpm sensor (L6/1) or right front rpm sensor (L6/2). Installation: Apply light coating of grease to bore in steering knuckle (2). Hot lubricating paste.
  3. Unlock and disconnect left front axle multiple circuit junction connector, major assembly compartment (X62/7) or right front axle multiple circuit junction connector, major assembly compartment (X62/6). Press clip in direction of arrow.
  4. Install in the reverse order.
  5. Installation: Ensure that the electrical feed line to the rpm sensor has sufficient play. The vehicle suspension must be able to fully compress and rebound without damaging the feed line. The feed line should not chafe at any point, as this could lead to system failure.
  6. Installation: Model 230 without code (P99) Special model "AMG Black Series", observe installation position: The chafe protection (1) must be screwed to the front rpm sensor as shown here. It must not be mounted between the rpm sensor and steering knuckle (2).
  7. Installation: On model 215, 220 check rotor of wheel hub for damage. Pay attention to cleanliness of magnetic tip.
  8. Connect STAR DIAGNOSIS, read out fault memory and erase if necessary

Torque specification:

  • Self-locking bolt, front axle rpm sensor to steering knuckle: 25 Nm

Front wheel speed sensor can be replaced without removing the wheel. To get access the steering wheel must be turned out as much as possible and Airmatic raised setting must set.

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W220 Front Wheel Speed Sensor Replacement (By Masood)

Remove/install left rear or right rpm sensor

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Rear wheel speed sensor replacement.

Remove/install stabilizer bar on front axle

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W220 Replace Stabilizer Bar and Link Rods (By Masood)


  • 10 - Stabilizer bar
  • 17 - Spring control arm
  • 21b - Retaining clip
  • 21e - Bolts
  • 23 - Link rod
  • 23b - Nut
  • 23c - Nut
  • 23d - Screw
  1. Raise vehicle with vehicle lift
  2. Remove bottom engine compartment paneling (vehicles with gasoline engine)
  3. Remove bottom section of soundproofing (vehicles with disel engine)
  4. Unscrew nut (23c) and pry link rod (23) off spring control arm (17). Check rubber boot of stabilizer bar pivot bushing in spring control arm (17) for damage and replace stabilizer bar pivot bushing if necessary. If the rubber boot of the stabilizer bar pivot bushing is damaged, the stabilizer bar pivot bushing (and not the spring control arm) has to be replaced. Installation: Press link rod (23) onto hexagon of stabilizer bar pivot bushing in spring control arm (17).
  5. Remove bolts (21e) and remove retaining bracket (21b). The threaded connection has been changed from M8 to M10. When using new parts the nut M8 possibly fitted in the frame-type integral support is to be replaced by a nut M10. Drill the hole in the frame-type integral support accordingly and protect against corrosion.
  6. Take off torsion bar (10). Check rubber mount of stabilizer bar (10) for damage and wear and replace stabilizer bar (10) if necessary. The rubber mounts are molded onto the torsion bar (10).
  7. Unscrew nut (23b) and remove link rod (23) from torsion bar (10). Installation: Tighten nut (23b) only when vehicle is in ready-to-drive condition. To do so, counterhold bolt (23d) with shortened Allen wrench (shop-made). Turn steering if necessary. Check rubber mount of link rod (23) for damage and replace link rod (23) if necessary.
  8. Install in the reverse order

Torque specifications:

  • Nut, link rod to spring control arm: 150 Nm
  • Nut, link rod to stabilizer bar: 150 Nm
  • Bolt, torsion bar to front end: 40 Nm

Remove/install front stabilizer bar link rod

Shown on left side of vehicle (W211):

  • 23 - Link rod
  • 23a - Nut
  • 23b - Nut
Stabilizer screw (hex 11mm)
Shortened 11mm Allen hex wrench
Unscrewing nut (23b) by counterholding
  1. Lift vehicle on lifting platform.
  2. Unscrew nut (23a) of link rod (23) from stabilizer bar pivot bushing. Do not damage rubber boot of stabilizer bar pivot bushing. If damaged, replace stabilizer bar pivot bushing. If the rubber boot of the stabilizer bar pivot bushing is damaged, the stabilizer bar pivot bushing (and not the spring control arm) has to be replaced.
  3. Unscrew nut (23b) of link rod (23) from stabilizer bar using box wrench bit. To do so, counterhold threaded bolt with shortened Allen hex wrench 11mm (shop-made). Turn steering if necessary. Installation: Replace self-locking nut (23b).
  4. Remove link rod (23) of torsion bar. This may require jacking up the spring control arm.
  5. Install in the reverse order

Replacing stabilizer bar bushings

Replacing bushings instead of the entire stabilizer will save ~10 EUR per stabilizer.

For pressing bushings in and out, M14 screw with appropriate caps can be used.

  • For pressing out: 44/34 pressing cap; 62/52 receiving cap.
  • For pressing in: 48/38 pressing cap; 62/52 receiving cap.
Pressing out bushings
Stabilizer link with old and new bushings
Pressing in bushings

Install new stabilizer bar pivot bushing in spring control arm

Shown on model 220:

  • 5 - Steering knuckle
  • 8 - Stabilizer bar pivot bushing
  • 9 - Rubber boot
  • 10 - Tie rod
  • 17 - Spring control arm
  • 18 - Torque strut
  • 19 - Rubber boot
  • 23 - Link rod
  • 23b - Nut
  • 23c - Nut
  • 23d - Screw
  1. Remove front wheel
  2. Detach torque strut (18) from steering knuckle (5). Installation: Replace self-locking nut. Check rubber boot on ball head of torque strut (18) for damage. If rubber boot is damaged, install new torque strut (18).
  3. Remove track rod (10) from steering knuckle (5). Installation: Replace self-locking nut.
  4. Loosen nut (23b). To do so, counterhold bolt (23d) with shortened Allen wrench (shop-made). Turn steering if necessary. Installation: Tighten nut (23b) only when vehicle is in ready-to-drive condition.
  5. Unscrew nut (23c), detach link rod (23) from spring control arm (17) and swing vertically upward. Installation: Press link rod (23) onto hexagon of stabilizer bar pivot bushing (8) on spring control arm (17).
  6. Remove rubber boot (9) and wire fasteners of torsion bar pivot bushing (8). When pressing out the torsion bar pivot bushing (8) with the rubber boot installed the special tool is damaged due to too high press-out force.
  7. Press stabilizer bar pivot bushing (8) out of spring control arm (17)
  8. Checking: Check rubber boot (19) of ball joint in spring control arm (17) for damage. If rubber boot (19) is damaged, install new spring control arm (17).
  9. Checking: Check rubber mount of spring control arm (17) for damage. Replace rubber mount if necessary.
  10. Install in the reverse order. Installation: Tighten nuts and bolts of chassis components only when vehicle is in ready-to-drive condition.

Press out/press in stabilizer bar pivot bushing

Pressing out:

  1. Do not use an impact wrench or other compressed-air tool otherwise the threaded spindle on the puller (2) will be damaged.
  2. The threaded spindle on puller (2) is only used for retensioning and not for pressing out the stabilizer bar pivot bushing (8).
  3. It is essential to remove the rubber boot (and its wire fasteners) of the torsion bar pivot bushing (8), otherwise the puller (2) will be damaged as a result of the high press-out forces.
  4. Press out stabilizer bar pivot bushing (8) with puller (2), press (1), press-out sleeve (2.1) and counterholder (2.3) from the spring control arm (17) opposite to the direction of travel.
  5. Attach the counterholder (2.3) correctly on the stabilizer bar pivot bushing (8) (see picture). The bore in the counterholder (2.3) must be seated centrally over the stabilizer bar pivot bushing (8). The removal and installation tool 220589074300 contains: Puller (2); Press-out sleeve (2.1); Counterholder (2.3).

Pressing in:

  1. Clean mounting hole in the spring control arm (17).
  2. Using puller (2), press (1), press-in sleeve (2.2) and counterholder (2.3) press stabilizer bar pivot bushing (8) into spring control arm (17) in the direction of travel.

Torque Specifications

Torque specs for a 2004 S600 (with ABC) are as follows from WIS. According to WIS, these values apply to all W220 and 215 cars with ABC. If your 2003 S600 has ABC, then it is assumed these apply. Do double check though as we will not be held liable for any damages.

  • Tie rod to steering knuckle (spindle) is 50NM then 60 degrees
  • Torque arm (thrust arm) to chassis 80NM then 120 degrees
  • Torque arm (thrust arm) to knuckle (spindle) 50NM then 60 degrees
  • Upper control arm to knuckle (spindle): 20NM then 90 degrees
  • Lower control arm (aka spring control arm-front rear lower control arm that shock mounts) to knuckle (spindle) 50NM then 60 degrees
  • Lower control arm (aka spring control arm-front rear lower control arm that shock mounts) to chassis 80NM then 120 degrees

NOTE: all must be torqued under load at the correct ride height (ie the vehicle on the ground). Since most don't have a four post lift, you'll need to take careful measurements, then support each corner accordingly before fully tightening. You will also need four eccentric bolts if you wish to have a proper wheel alignment done afterwards. Eccentric bolt kits are # W0133-1630584

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