Engine belt: Difference between revisions

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To remove tension from idler pulley, locate 17mm tensioner bolt located on tensioner bracket (see photo below). Belt obstructs the view so it has to be found by feel.
To remove tension from idler pulley, locate 17mm tensioner bolt located on tensioner bracket (see photo below). Belt obstructs the view so it has to be found by feel.
After locating 17mm bolt, push down the bar (see photo below).
After locating 17mm bolt, push down the bar counter-clockwise (see photo below).
When putting the belt back on, it is easier to leave the last part of the belt to slide over the water pump pulley as it has no lip or grooves.


[[File:W220_S500_removing_serpentine_belt.jpg|300px]]
[[File:W220_S500_removing_serpentine_belt.jpg|300px]]

Revision as of 20:45, 23 July 2019

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Description

The Poly-V-belt drive (commonly known as the Serpentine Belt) drives engine components (alternator, AC compressor, etc.) from the engine.

Layout Diagrams

S350/S430/S500

  1. Automatic belt tensioner
  2. ABC tandem pump (pump for power-steering assistance and ABC chassis)
  3. Air conditioning compressor
  4. Crankshaft
  5. Coolant pump
  6. Generator (alternator)
  7. Idler pulley

Length: 2380mm

S55 AMG

The S 55 AMG has two poly-V-belts (belt one shown in purple/belt two shown in black).
  1. Idler pulley
  2. Automatic belt tensioner
  3. ABC tandem pump (pump for power-steering assistance and ABC chassis)
  4. Air conditioning compressor
  5. Crankshaft
  6. Coolant pump
  7. Generator (alternator)
  8. Idler pulley
  9. Automatic belt tensioner
  10. Supercharger

Length of belt one: 1289 mm

Length of belt two: 2462 mm

S600

  1. Automatic belt tensioner
  2. ABC tandem pump (pump for power-steering assistance and ABC chassis)
  3. Air conditioning compressor
  4. Crankshaft
  5. Coolant pump
  6. Generator (alternator)
  7. Idler pulley
  8. Idler pulley
  9. Idler pulley

Length: 2335 mm

Replacing belt

To remove tension from idler pulley, locate 17mm tensioner bolt located on tensioner bracket (see photo below). Belt obstructs the view so it has to be found by feel. After locating 17mm bolt, push down the bar counter-clockwise (see photo below). When putting the belt back on, it is easier to leave the last part of the belt to slide over the water pump pulley as it has no lip or grooves.

See photo DIY here (S350/S430/S500): http://www.benzworld.org/forums/w220-s-class/1582489-drive-belt-idler-change-photo-diy.html

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