Timing chain replacement: Citroen C-Crosser 2.4 (4B12)

🧭 Before you start

• Opens: engine oil
• Timing position: the crankshaft or camshaft is set and locked during this job
• Renewed: gaskets hooks

Don't miss

• Use an Allen key to counterhold

🔧 Engine codes this applies to

📐 24 workshop diagrams for 4B12(SFZ)

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. Hooks:
3. Disconnect the battery
4. Remove the strut brace
5. Engine, support/cross member:

6. Remove the ignition coils
7. Remove the coolant reservoir
8. Remove the bolts shown
9. Disconnect the feed line from the power steering pump
10. Disconnect the power steering hose
11. Removal sequence:
12. Valve cover
13. Crankshaft pulley
14. Raise the vehicle until the wheels are suspended
15. Remove the front underbody cover
16. Remove the right-hand splash guard
17. Check that cylinder 1 is still at TDC
18. Check the timing marks
19. Unscrew the coolant pump pulley bolts
20. Remove the ancillary drive belt
21. Use the special tools to remove the crankshaft pulley
22. Drain the engine oil
23. Remove the air-conditioning compressor bolts
24. Remove the air-conditioning compressor bracket
25. Remove the oil sump
26. Use a special tool to cut the sealant
27. Disconnect the alternator electrical connections
28. Remove the alternator mounting bolts
29. Remove the belt tensioner
30. Fit the engine hanger
31. Remove the bolts from the engine/gearbox support
32. Remove the engine mounting bracket
33. Remove the bolts from the timing chain cover
34. Check the timing marks
35. Use a screwdriver to release the tensioner pawl
36. Remove the timing chain

Installation and checks

37. Fit the timing chain
38. Use an Allen key to counterhold
39. Align the crankshaft timing marks
40. Fit the chain tensioner
41. Fit the chain tensioner guide
42. Refit the timing chain upper guide rail
43. Remove the Allen key
44. Fit the crankshaft pulley
45. Note: Finger-tight only
46. Turn the crankshaft clockwise to align the timing marks
47. Check that cylinder 1 is still at TDC
48. Apply sealant as indicated
49. Refit the timing chain cover
50. Within 3 minutes
51. Tighten the timing cover bolt(s)
52. Engage the sealing ring in the timing cover
53. Fit the engine supports
54. Fit the ancillary drive belt tensioner
55. Refit the alternator
56. Refit the coolant pump pulley
57. Renew the crankshaft oil seal
58. Fit the crankshaft pulley
59. Apply sealant as indicated
60. Refit the oil sump
61. Within 3 minutes
62. Refit the bolts
63. Refit the air-conditioning compressor bracket
64. Refit the air-conditioning compressor
65. Fit the ancillary drive belt
66. Tighten the crankshaft pulley centre bolt
67. Fit the coolant pump pulley bolts
68. Renew the seal
69. Tighten the bleed screw
70. Apply sealant as indicated
71. Refit the valve cover
72. Pre-tighten the bolt(s)
73. Tighten the bolts
74. Refit the oil filler tube
75. Reconnect the battery

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