Timing chain replacement: Mercedes-Benz 276.9 W204 (276.957)

🧭 Before you start

Fits: platform codes 300, -4MATIC, |, 350, BLUEEFF, -T, -COUPE

• Opens: fuel

Don't miss

• If the timing chain is to be re-used, mark the running direction before removal
• Do not drop any timing chain pins into the crankcase

🔧 Engine codes this applies to

📐 22 workshop diagrams for 276.957

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

📋 Procedure

Preparation and removal

1. Always use new gaskets
2. Timing chain assembly tools:
3. Connect the old chain to the new one
4. If the timing chain is to be re-used, mark the running direction before removal
5. Turn the engine until the chain connecting link shows

6. Disconnect the chain
7. Valve cover
8. Camshaft bearing cap
9. Disconnect the inlet variable camshaft timing solenoid
10. Disconnect the electrical wiring
11. Remove the cylinder head front cover
12. Remove the covers
13. Fuel rail:
14. Release the fuel pressure
15. Disconnect the fuel lines from the fuel rail
16. Disconnect the electrical connector(s) from the fuel rail
17. Remove the fuel rail
18. Remove the injectors
19. High-pressure pump:
20. Remove the high-pressure pump
21. Disconnect the Hall sensor wiring
22. Disconnect the ignition coil cables
23. Remove the centrifuge cover
24. Remove the centrifuge
25. Remove the ignition coils
26. Remove the cylinder head cover
27. In the reverse order of installation
28. Turn the crankshaft to 40° ATDC for cylinder 1
29. Check the position of the camshafts
30. Left-hand side:
31. Remove the chain tensioner
32. Right-hand side:
33. Remove the chain tensioner
34. Remove the camshaft bearing caps
35. Remove the camshafts
36. Separate the timing chain
37. Note: Cover the timing chain housing with a clean cloth
38. Use the special tools to remove the timing chain pins
39. Note: Do not drop any timing chain pins into the crankcase
40. Remove the special tools
41. Pull the removed timing chain pins out of the chain separating tool

Installation and checks

42. Connect the ends of the new chain
43. Fit the timing chain holding tool
44. Timing chain assembly tool:
45. Tighten the special tool
46. Refit all other parts in the reverse order of removal
47. Repeat the procedure on the other side
48. Turn the engine 2 rotations by hand
49. Check the position of the camshafts

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