Cylinder head removal & torque: Mercedes-Benz 901.0, 902.0, 903.0, 904.0 2.3 (111.979)

🧭 Before you start

Fits: platform codes 214, |, 314, 414

• Opens: coolant, fuel
• Timing position: the crankshaft or camshaft is set and locked during this job

Don't miss

• The paint on the camshaft gearwheel and chain must be aligned
• Top up the coolant level to the MAX mark

🔧 Engine codes this applies to

📋 Procedure

Preparation and removal

1. Disconnect the battery earth cable
2. Drain the coolant
3. Remove the fan cowling
4. Remove the air inlet hose
5. Remove the idle speed actuator

6. Remove the ignition coils
7. Vehicles with automatic transmission
8. Disconnect the dipstick tube support
9. All vehicles:
10. Disconnect the injector wiring
11. Remove the timing belt upper cover
12. Vehicles with automatic transmission
13. Turn the crankshaft to 25° ATDC for cylinder 1
14. Lock the camshafts
15. Screw guide pins into cylinder block
16. Disconnect the vacuum hoses
17. Unscrew the end-piece
18. Vehicles with automatic transmission
19. Push the thrust pin and detent pin forwards out of the housing
20. All vehicles:
21. Disconnect the fuel lines
22. Remove the power steering pump bracket
23. Disconnect the remaining wiring and hoses from the cylinder head
24. The paint on the camshaft gearwheel and chain must be aligned
25. Disconnect the exhaust pipe from the exhaust manifold
26. Remove the cylinder head bolts
27. In the order shown
28. Remove the cylinder head gasket

Installation and checks

29. Tighten the cylinder head bolts
30. Fit the power steering pump bracket
31. Reconnect the throttle cable
32. Reconnect the vacuum hoses
33. Refit the inlet camshaft gearwheel
34. Stage 1:
35. Stage 2:
36. Stage 1:
37. Stage 2:
38. Remove the guide pins
39. Note: Check the locating pin(s)
40. Renew the bolt(s)
41. Stage 3:
42. Stage 4:
43. Insert the thrust pin together with the detent pin from the rear
44. Refit the timing chain cover
45. Reconnect the injector wiring
46. Check that all the wiring and hoses are reconnected
47. Vehicles with automatic transmission
48. Refit the automatic transmission dipstick tube support
49. All vehicles:
50. Refit the ignition coil(s)
51. Refit the idle speed actuator
52. Refit the air inlet hose
53. Refit the fan and the viscous coupling
54. Refit the fan cowling
55. Top up the coolant level to the MAX mark
56. Reconnect the battery earth cable

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