Cylinder head removal & torque: Opel AstraG, Z14XEP 1.2 (X12XE, Z12XE)

🧭 Before you start

Fits: platform codes 1.2, 16V

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

🔧 Engine codes this applies to

📋 Procedure

Preparation and removal

1. Further refitting is in the reverse order of removal
2. Disconnect the battery
3. Disconnect the fuel feed and return lines
4. Disconnect the brake servo vacuum hose
5. Use a special tool:

6. Disconnect the crankshaft position sensor
7. Oxygen sensor
8. Drain the cooling system
9. Air-conditioning compressor:
10. Coolant pump pulley:
11. Engine supports:
12. Exhaust pipe:
13. Remove the ignition module
14. Disconnect the coolant temperature sensor
15. Remove the thermostat housing
16. Disconnect the throttle body heater hose
17. Fit the special tools
18. Remove the exhaust manifold heat shield
19. Vehicles with air conditioning:
20. Lock the V-belt tensioner
21. Note: A click will be heard when the tensioner locks
22. Remove the V-belt
23. Remove the coolant pump pulley
24. Loosen the coolant pump
25. Remove the timing chain cover
26. Remove the ignition module
27. Use a special tool:
28. Disconnect the crankcase breather hose
29. Remove the valve cover
30. Turn the crankshaft to TDC for cylinder 1
31. Align the crankshaft timing marks
32. Camshaft locking tool:
33. Use a special tool to lock the crankshaft
34. Align the camshaft timing marks
35. Use a special tool to block the camshafts
36. Remove the camshaft sensor
37. Remove the chain guide(s)
38. Remove the camshaft gearwheels
39. Remove the cylinder head bolts
40. Remove the cylinder head

Installation and checks

41. Tighten the cylinder head bolts
42. Cylinder head torque settings - Refer to 'Adjustment data/Torque settings'
43. Refit the timing cover
44. Unlock the tensioner
45. Turn the engine 2 rotations clockwise
46. Check the timing marks
47. Remove the special tools
48. Lock the tensioner; use a locking pin
49. Remove the camshaft locking tool
50. Remove the tensioner locking tool

Other OPEL / VAUXHALL procedures

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• Corsa B Clutch X10XE / X12XE (With service aperture)
• Corsa B X12XE
• Opel Corsa C 1.2 CDTI timing chain replacement
• Opel Astra G 2.2 DTI Y22DTR timing chain replacement
• Opel VectraC, Signum 2.8 Z28NEL timing chain replacement
• Opel Astra G 2003 2.0 DTI Y20DTH timing chain replacement
• Opel Astra G X Y 20DTL 2.0 DTI X20DTL timing chain replacement