Timing chain replacement: Opel Omega B DTH (X20DTH, Y22DTH)

🧭 Before you start

Fits: platform codes 2.0, TD, 16V, |, 2.2, DTI

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

Don't miss

• Ensure the injection pump locking tool can be removed and installed
• The cover must be fitted (including torque checking) within 10 minutes
• The tensioner damper must only be stored in the upright position. Incorrectly stored dampers may be bled by repeated compression in installation position

🔧 Engine codes this applies to

📐 70 workshop diagrams for X20DTH

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

📋 Procedure

Preparation and removal

1. Chain tensioner
2. Unless otherwise advised by the manufacturer, the following procedures are recommended:
3. Always use new gaskets
4. Remove the bolts from the engine wiring bracket
5. Note: Avoid bending, torsion or traction

6. Use the special tool
7. Fit the injection pump locking pin
8. Remove the wiring loom from the cylinder head
9. Disconnect the fuel lines
10. Screw in the end piece
11. Disconnect the brake servo vacuum hose
12. Fit the special tool
13. Vehicles with air conditioning:
14. Remove the bolts from the engine lifting eyes
15. All vehicles:
16. Remove the engine lower cover
17. Note: Apply pressure to the timing chain as shown
18. Tighten the bolt to lock the tensioning tool in position
19. Note: Ensure the injection pump locking tool can be removed and installed
20. If necessary
21. Remove the intercooler pipe
22. Remove the cover
23. Screw in the end piece
24. Turn the crankshaft clockwise until just before TDC for cylinder 1
25. Check the timing marks
26. Fit the crankshaft TDC locking pin
27. Check the timing marks
28. Remove the upper chain tensioner
29. Remove the bolts
30. Remove the timing chain upper guide rail
31. Remove the lower chain tensioner
32. Remove all the locking pins
33. Remove the timing chain

Installation and checks

34. Refit the injection pump gearwheel
35. Fit the camshaft gearwheel
36. Do not tighten!
37. Remove the injection pump locking pin
38. Tighten the injection pump gearwheel
39. Tighten the camshaft gearwheel bolts lightly until there is no play
40. Renew the bolt(s)
41. Tighten the camshaft gearwheel
42. Renew the seal
43. Remove the tensioning tool
44. Fit the crankshaft TDC locking pin
45. Turn the crankshaft until the locking pin fits
46. Check the timing marks again
47. Note: Correct the positions of the camshaft and injection pump gearwheels if the special tool does not fit
48. Fit the injection pump locking pin
49. Check that the special tool fits
50. Renew the seal
51. Renew the bolt(s)
52. Apply sealant as indicated
53. Note: The cover must be fitted (including torque checking) within 10 minutes
54. Refit the intercooler pipe
55. Refit the battery
56. Refit the tensioner damper to the tensioner
57. Note: The tensioner damper must only be stored in the upright position. Incorrectly stored dampers may be bled by repeated compression in installation position
58. Refit the ancillary drive belt tensioner
59. Refit the ancillary drive belt
60. Tension the belt
61. Refit the engine lower cover
62. Vehicles with air conditioning:
63. Fit the coolant hoses
64. Refit the bolts to the engine lifting eyes
65. All vehicles:
66. Refit the vacuum pump
67. Renew the seal
68. Renew the bolt(s)
69. Refit the vacuum pump hose
70. Refit the brake servo vacuum hose
71. Refit the wiper motor
72. Refit the cylinder head cover
73. Renew the gasket
74. Apply sealant as indicated
75. Tighten the cylinder head cover bolts
76. Reconnect the vacuum hose
77. Reconnect the fuel lines
78. Refit the bracket
79. Refit the wiring loom to the cylinder head
80. Connect the glow plugs
81. Refit the engine wiring loom
82. Connect to battery +
83. Reconnect the multiplug
84. Reconnect the crankcase breather hose
85. Refit the engine upper cover(s)
86. Reconnect the battery earth cable

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