Timing chain replacement: Opel Agila B 1.2 (K12B)

🧭 Before you start

Drain the oil and remove the sump, strainer, front exhaust pipe, pulleys and engine mounting bracket with the gearbox supported. Take off the cover, tensioner, guide rail and exhaust camshaft gearwheel, then fit the new chain with the crankshaft gearwheel. Fit a new tensioner and camshaft gearwheel, check the timing after 2 turns, renew the front oil seal, seal and refit the covers, and set the ancillary belt deflection.

Fits: platform codes 1.2, 16V

• Opens: engine oil
• Renewed: camshaft gearwheel note

Don't miss

• Renew the camshaft gearwheel and the chain tensioner as part of this job.
• Rotate the crankshaft clockwise by 2 turns and recheck the marks before fitting the cover.
• Renew the crankshaft oil seal in the front cover.
• Hold the crankshaft pulley with the special tool when undoing the centre bolt.
• Check the audio system security code before disconnecting the battery.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📋 Procedure

Preparation and removal

1. Before disconnecting the battery cable, check the audio system security code
2. Renew the camshaft gearwheel
3. Note: Avoid bending, torsion or traction
4. Remove the breather pipe
5. Remove the wheel cover

6. Impact absorber:
7. Remove the impact absorber
8. Drain the engine oil
9. Remove the oil filter
10. Remove the gasket(s)
11. Oil sump
12. Remove the oil sump
13. Remove the oil strainer
14. Vehicles with manual gearbox:
15. Remove the subframe support tool
16. Fit a transmission jack to support the transmission
17. Loosen the bolt slightly to release the tension
18. Remove the coolant pump pulley
19. Remove the tensioner bracket
20. Use a special tool to hold the crankshaft pulley
21. Remove the crankshaft pulley centre bolt
22. Use the special tools to remove the crankshaft pulley
23. Remove the lifting eye
24. Remove the engine mounting bracket
25. Remove the chain tensioner
26. Remove the chain guide rail
27. Vehicles with air conditioning:
28. Remove the exhaust camshaft gearwheel

Installation and checks

29. Fit the timing chain together with the crankshaft gearwheel
30. Fit the chain tensioner guide
31. Renew the chain tensioner
32. Rotate the crankshaft clockwise by 2 turns
33. Refit the studs
34. Renew the crankshaft oil seal in the engine front cover
35. Check the distance
36. Engine mounting bracket
37. Refit the engine mounting bracket
38. Refit the gearbox bolts
39. Vehicles with automatic transmission
40. Refit the gearbox support bracket
41. All vehicles:
42. Lower the vehicle
43. Vehicles with air conditioning:
44. Refit the drain plug
45. Refit the front exhaust pipe
46. Renew the gasket
47. Renew the gasket
48. Refit the coolant pump pulley
49. Do not tighten!
50. Refit the front right wheel
51. Fit the ancillary drive belt
52. New belt:
53. Turn the bolt to tension the belt
54. New belt:
55. Tighten the bolt
56. All vehicles:
57. Tighten the coolant pump pulley
58. Renew the cylinder head gasket
59. Refit the cylinder head cover
60. Refit the breather pipe
61. Refit the dipstick
62. Refit the ventilation pipe
63. Refit and connect the ignition coils
64. Refit the air filter
65. Refill the engine oil
66. Reconnect the battery earth cable

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