TorqFix

OM642 in W463 — MERCEDES-BENZ

OM642 in W463 on Mercedes-Benz: 157 steps, engines 642.886, 642.970. What to remove, in what order, and what to check after.

Workshop procedure for MERCEDES-BENZ — the exact step sequence and torque figures, straight from real workshop data.

157 steps 2 engine codes

🔧 Engine codes this applies to

642.886642.970

📐 25 workshop diagrams for 642.886

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

OM642 in W463 — 642.886 · diagram 1
OM642 in W463 — 642.886 · diagram 2
OM642 in W463 — 642.886 · diagram 3
OM642 in W463 — 642.886 · diagram 4
OM642 in W463 — 642.886 · diagram 5
OM642 in W463 — 642.886 · diagram 6
OM642 in W463 — 642.886 · diagram 7
OM642 in W463 — 642.886 · diagram 8
+ 17 more diagrams
🔒 25 workshop diagrams for this job Ask about your Mercedes-Benz 642.886 — free or sign up free to see the drawings

📋 Procedure

Preparation and removal

  1. If the timing chain is to be re-used, mark the running direction before removal
  2. Disconnect the battery earth cable
  3. Remove the engine upper cover
  4. Note: Avoid bending, torsion or traction
  5. Right-hand bank:
642.886? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Disconnect the mass airflow meter wiring
  2. Disconnect the positive crankcase ventilation hose
  3. Left-hand bank:
  4. Disconnect the mass airflow meter wiring
  5. Disconnect the air filter hose
  6. Centre:
  7. Disconnect the heater unit wiring
  8. Remove the air inlet hose from the turbocharger
  9. Remove the upper air duct
  10. Remove the pressure line between the turbocharger and the intercooler
  11. Right-hand bank:
  12. Remove the noise insulation cover
  13. Disconnect the fuel lines from the injectors
  14. Disconnect the fuel injector wiring
  15. Remove the fuel injector clamps
  16. Remove the injectors
  17. Store in order
  18. Disconnect the fuel lines from the fuel rail
  19. Disconnect the fuel rail pressure sensor
  20. Remove the high-pressure line(s)
  21. Remove the fuel rail
  22. Plug the holes
  23. Remove the cover
  24. Disconnect the vacuum pump hose
  25. Remove the vacuum pump
  26. Remove the oil separator
  27. Disconnect the camshaft position sensor(s)
  28. Loosen the bolts in a criss-cross pattern, starting from the outside
  29. Remove the bolts
  30. Remove the cylinder head cover
  31. Fit the camshaft locking tool
  32. Camshaft gearwheel locking tool:
  33. Remove the camshaft gearwheel bolt
  34. Turn the crankshaft to TDC for cylinder 1
  35. Check the position
  36. Secure the chain against the camshaft gearwheel
  37. Note: Use a cable tie
  38. Remove the chain tensioner piston
  39. Fit the camshaft gearwheel locking tool
  40. Remove the camshaft locking tool
  41. Timing chain assembly links:
  42. Use a timing chain assembly link
  43. Turn the engine until the chain connecting link shows
  44. Note: Remove the cable tie before turning the engine
  45. Disconnect the chain
  46. Remove the assembly link
  47. Remove the camshaft gearwheel locking tool
  48. Remove the camshaft locking tool
  49. Secure the chain against the camshaft gearwheel
  50. Note: Use a cable tie
  51. Remove the inlet camshaft

Installation and checks

  1. Connect the ends of the new chain
  2. Fit the timing chain holding tool
  3. Tighten the special tool
  4. Timing chain separating tools:
  5. Timing chain separating tools:
  6. Use the special tools to remove the timing chain pins
  7. Note: Do not drop any timing chain pins into the crankcase
  8. Remove the special tools
  9. Refit the inlet camshaft
  10. Fit the camshaft locking tool
  11. Stage 1:
  12. Tighten the camshaft gearwheel bolts
  13. Stage 2:
  14. Refit the chain tensioner piston
  15. Stage 3:
  16. Turn the engine by hand
  17. Note: Remove the cable tie before turning the engine
  18. Check the timing
  19. Remove the camshaft locking tool
  20. Refit the cylinder head cover
  21. Stage 1:
  22. Refit the bolts
  23. Stage 2:
  24. Tighten the bolts in a criss-cross pattern, starting from the centre
  25. Reconnect the camshaft position sensor(s)
  26. Refit the oil separator
  27. Vacuum pump:
  28. Refit the vacuum pump
  29. Refit the vacuum pump hose
  30. Refit the cover
  31. Fuel rail:
  32. Refit the fuel rail
  33. Stage 1:
  34. Refit the high-pressure line(s)
  35. Reconnect the fuel rail pressure sensor
  36. Reconnect the fuel lines to the fuel rail
  37. Injector
  38. Refit the injectors
  39. Stage 1:
  40. Refit the fuel injector clamps
  41. Stage 2:
  42. Reconnect the fuel injector wiring
  43. Stage 3:
  44. Reconnect the fuel lines to the injectors
  45. Refit the noise insulation cover
  46. Centre:
  47. Refit the pressure line between the turbocharger and the intercooler
  48. Check for correct fitting
  49. Refit the upper air duct
  50. Refit the air inlet hose to the turbocharger
  51. Reconnect the heater unit wiring
  52. Left-hand bank:
  53. Refit the air filter hose
  54. Reconnect the mass airflow meter wiring
  55. Right-hand bank:
  56. Reconnect the positive crankcase ventilation hose
  57. Reconnect the mass airflow meter wiring
  58. Refit the air filter housing
  59. General:
  60. Reconnect the battery earth cable
  61. Check for any fault codes
  62. Run the engine
  63. Check for leaks
  64. Refit the engine upper cover
Workshop diagrams

Ask TorqFix about your Mercedes-Benz 642.886 — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.

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Other MERCEDES-BENZ procedures

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com

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Workshop data on this page last updated 20 Sep 2026.