DIY Transmission Service W220 WITHOUT TC Drain Plug

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Back to WIS 27.00 Transmission - General

Printable Summary of Method Using DIY Flushing System and Fluid Quantities

  • 1. Shift trans selector in Neutral with ignition off.
  • 2. Get the car raised with the trans pan level.
  • 3. Remove the engine splash panel.
  • 4. Layout plastic drop sheets under trans pan and intermediate connector.
  • 5. Find suitable containers for catching and storing at least 10L of waste fluid.
  • 6. Have a pen and paper ready to record all fluid removed/replaced quantities.
  • 7. Open the trans to cooler supply line at the intermediate in-line connector and catch the fluid. (Expect about 0.02L.)
  • 8. Add 2L of new fluid into Flushing System New Fluid Pressure Container.
  • 9. With the two Flushing System hydraulic lines connected together, prime output line and in-line filter of flushing system with new fluid using hand pump in the New Fluid Container with any one air connection open. (Uses about 0.3L.)
  • 10. Install the flushing system in the trans to cooler supply line.
  • 11. Bend over and clamp rubber inlet hose to Old Fluid container to prevent fluid going back into Trans. Use either Flushing System hand pump to pressurise both Old and New Fluid Containers. Observe the New Fluid Container level and allow 1L of new fluid to discharge into trans cooler and return line. This flushes old fluid from the trans cooler and return line into the trans pan.
  • 12. Remove the wiring brace at the front of the trans pan and tuck the cables out of the way.
  • 13. TAKE A PHOTO and carefully check the position and location of the pan bolts and sprags. (Front right corner has odd sprag with threaded bolt hole.)
  • 14. Remove the trans drain plug and catch the fluid. (Keep steady upward force on 6mm hex socket.) (Expect only a few drops of fluid.)
  • 15. Dislodge the trans overflow tube and catch the fluid. (Expect about 2 – 3L.)
  • 16. Remove three pan bolts on right side.
  • 17. Remove the three bolts on left side and catch the fluid. Keep pan level. (Expect about 1 - 2L.)
  • 18. Remove the Transmission Filter and catch the old fluid. (Expect about 1 - 2L.)
  • 19. Record the quantity of fluid collected during the pan and filter removal process.
  • 20. TAKE A PHOTO and then remove white overflow pipe and magnets from inside trans pan.
  • 21. Clean pan, and magnets.
  • 22. Clean trans gasket seat.
  • 23. Install new filter. Listen for definite CLICK.
  • 24. Reinstall magnets.
  • 25. Install new white overflow tube. Notice a definite CLICK.
  • 26. Install new pan gasket on cleaned pan.
  • 27. Have six NEW transmission bolts and sprags ready.
  • 28. Reinstall pan and while pushing the pan toward the rear, hand tighten bolts.
  • 29. Torque each bolt in a cross pattern in stages to 4Nm (3 ft-lbf), then tighten each bolt an additional 180°.
  • 30. Reinstall the electrical connectors at front of pan. (Tucked away they touch the exhaust.)
  • 31. Calculate the quantity of oil removed so far. Will be about 7L.
  • 32. Fill Assenmacher Refill Container with 5L new fluid. Record any fluid quantity changes.
  • 33. Attach adapter to pan.
  • 34. Using Assenmacher pump in the initial quantity of fluid into the transmission pan. (The trans should now have its original quantity of fluid but as a mixture of new fluid in pan and old fluid in torque converter.)
  • 35. Shut off valve and leave the Assenmacher adapter, pump, and re-fill container in place.
  • 36. Make sure Flushing System New Fluid Container contains about 4L of new fluid. Record any fluid quantity changes.
  • 37. Use either hand pump to provide some initial pressure in both Old and New Fluid Containers. (Watch the level of the New Fluid Container as a guide as to how much pressure to add, ie pressurise until the level just starts to reduce.)
  • 38. Flush Torque converter. Start engine and observe discharge of old fluid into the flushing system.
  • 39. If necessary shut off engine to add a pause in the process.
  • 40. When convenient place foot on brake and shift through "P-R-N-D" several times.
  • 41. When the colour of discharge fluid appears clean or when the 4L of old fluid is discharged and 4L of new fluid is consumed, stop engine.
  • 42. It may be necessary to add more clean fluid and repeat until discharged fluid is clean. Record any fluid quantity changes.
  • 43. The trans pan, torque converter and cooler should now contain close to 100% new fluid.
  • 44. Remove the flushing system.
  • 45. Have pan drain plug and new crush washer ready for final installation.
  • 46. Connect charger to car battery or charging point.
  • 47. Connect STAR Diagnosis Assistance System to OBDII connector.
  • 48. Using STAR, monitor trans fluid temperature. (ECU/Electronic transmission control (722.9 7G-Tronic)/Actual values/Oil level check/F2/010 Transmission oil temperature.)
  • 49. Restart car engine and allow to idle in Park.
  • 50. Shut off engine when fluid reaches 45°C.
  • 51. Using Assenmacher pump in remaining fluid to make a total of 9.5L. Record any fluid quantity changes.
  • 52. Leave filler adapter in place and allow transmission to cool down to say 40°C.
  • 53. Final Fluid Level Setting. Start the engine. DO NOT SHUT OFF THE ENGINE UNTIL INSTRUCTED TO BELOW, ie only when fluid level is correct as below.
  • 54. With engine idling and foot on brake, shift through "P-R-N-D" several times.
  • 55. When the fluid temperature just reaches exactly 45°C remove the adapter filler.
  • 56. Observe the quality of the fluid discharging from the drain plug aperture.
  • 57. When only a small quantity of fluid dribbles out, reinstall the pan drain plug with a new crush washer. Torque drain pan plug to 22Nm (16.5 ft-lbf).
  • 58. Shut off the engine.
  • 59. The transmission fluid is now at the correct level.
  • 60. If no fluid was discharged when the trans fluid temp reached the 45°C mark (with engine idling and transmission in Park), then add more fluid and repeat the last few steps.
  • 61. Measure quantity of fluid that dribbled out during level setting.
  • 62. Clean any excess fluid off of pan and drain plug and reinstall underskirts etc.

Printable Summary of Table of Fluid Quantities Used

The numbers in the following table refer to the section Printable Summary of Method Using DIY Flushing System and Fluid Quantities

Quantities of New and Old Transmission Fluids Used
Action Qty in Assenmacher Refill Container [L] Qty in Flushing System New Fluid Container [L] Qty in Flushing System Old Fluid Container [L] Actual Qty Into Transmission [+ In L] Actual Qty Out-of Transmission [- Out L] Estimated Transmission Total Qty [L]
0. At Start
7. Open the trans to cooler supply line at the intermediate in-line connector and catch the fluid.
8. Add 2L of new fluid into Flushing System New Fluid Pressure Container.
9. Prime output line and in-line filter of flushing system with new fluid using hand pump in the New Fluid Container
11. … flushes old fluid from the trans cooler and return line into the trans pan
11. … flushes old fluid from the trans cooler and return line into the trans pan


Quantities of New and Old Transmission Fluids Used
Action Qty in Assenmacher Refill Container [L] Qty in Flushing System New Fluid Container [L] Qty in Flushing System Old Fluid Container [L] Actual Qty Into Transmission [+ In L] Actual Qty Out-of Transmission [- Out L] Estimated Transmission Total Qty [L]
14. Remove the trans drain plug and catch the fluid.
15. Dislodge the trans overflow tube and catch the fluid.
18. Remove the Transmission Filter and catch the old fluid.
32. Fill Assenmacher Refill Container with 5L new fluid.
34. Using Assenmacher pump in the initial quantity of fluid into the transmission pan.


Quantities of New and Old Transmission Fluids Used
Action Qty in Assenmacher Refill Container [L] Qty in Flushing System New Fluid Container [L] Qty in Flushing System Old Fluid Container [L] Actual Qty Into Transmission [+ In L] Actual Qty Out-of Transmission [- Out L] Estimated Transmission Total Qty [L]
36. Make sure Flushing System New Fluid Container contains about 3L of new fluid.
38. Flush Torque converter. Start engine and observe discharge of old fluid into the flushing system.
42. It may be necessary to add more clean fluid and repeat until discharged fluid is clean.
44. Remove the flushing system.


Quantities of New and Old Transmission Fluids Used
Action Qty in Assenmacher Refill Container [L] Qty in Flushing System New Fluid Container [L] Qty in Flushing System Old Fluid Container [L] Actual Qty Into Transmission [+ In L] Actual Qty Out-of Transmission [- Out L] Estimated Transmission Total Qty [L]
51. Using Assenmacher pump n remaining fluid to make a total of 9.5L.
53. Final Fluid Level Setting. After stopping the engine.
53. Final Fluid Level Setting. After stopping the engine.
59. The transmission fluid is now at the correct level.
61. Measure quantity of fluid that dribbled out during level setting.
100. At end.
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