OM642 (642.975) in W461 — MERCEDES-BENZ

🧭 Before you start

Fits: platform codes G280, CDI

• Opens: coolant, fuel
• Timing position: the crankshaft or camshaft is set and locked during this job
• Special tools named: locking tool

Don't miss

• If the timing chain is to be re-used, mark the running direction before removal
• Use the special tool to counterhold
• Do not drop any timing chain pins into the crankcase
• Top up the coolant level to the MAX mark

🔧 Engine codes this applies to

📋 Procedure

1. Disconnect the battery earth cable
2. Refit the inlet camshaft
3. If the timing chain is to be re-used, mark the running direction before removal
4. Right-hand bank:
5. Remove the air filter housing

6. Always use new gaskets
7. Disconnect the positive crankcase ventilation hose
8. Camshaft locking tool:
9. Camshaft gearwheel locking tool:
10. Timing chain separating tools:
11. Timing chain assembly links:
12. Timing chain assembly tools:
13. Centre:
14. Disconnect the heater unit wiring
15. Remove the air inlet hose from the turbocharger
16. Remove the upper air duct
17. Remove the pressure line between the turbocharger and the intercooler
18. Remove the fan and viscous coupling
19. Use the special tool to counterhold
20. Disconnect the coolant hose from the EGR valve
21. Note:
22. Remove the expansion tank pressure cap
23. Collect the escaping fluid in a container
24. Remove the nuts
25. Remove the bolts
26. Disconnect the EGR valve electrical connection(s)
27. Remove the EGR valve
28. Right-hand bank:
29. Remove the noise insulation cover
30. Disconnect the fuel lines from the injectors
31. Disconnect the fuel injector wiring
32. Remove the fuel injector clamps
33. Remove the injectors
34. Store in order
35. Disconnect the fuel lines from the fuel rail
36. Disconnect the fuel rail pressure sensor
37. Remove the high-pressure line(s)
38. Remove the fuel rail
39. Plug the holes
40. Remove the cover
41. Check the position
42. Remove the vacuum pump
43. Remove the oil separator
44. Disconnect the camshaft position sensor(s)
45. Fit the camshaft gearwheel locking tool
46. Connect the old chain to the new one
47. Remove the cylinder head cover
48. Fit the camshaft locking tool
49. Remove the camshaft gearwheel bolt
50. Turn the crankshaft to TDC for cylinder 1
51. Remove the assembly link
52. Remove the camshaft gearwheel locking tool
53. Note: Use a cable tie
54. Secure the chain against the camshaft gearwheel
55. Remove the camshaft gearwheel bolts
56. Remove the camshaft locking tool
57. Remove the inlet camshaft
58. Separate the timing chain
59. Note: Cover the timing chain housing with a clean cloth
60. Fit the timing chain holding tool

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