Timing belt replacement: Opel AstraG 1.7 TD (X17DTL)

🧭 Before you start

Fits: platform codes 1.7, TD

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

Don't miss

• Never turn the engine in the direction opposite to that of normal operation
• The engine must be cold before timing belt adjustment
• Loosen the camshaft gearwheel bolts slightly but ensure the gearwheel can rotate freely

🔧 Engine codes this applies to

📋 Procedure

Preparation and removal

1. Never turn the engine in the direction opposite to that of normal operation
2. Note: The engine must be cold before timing belt adjustment
3. Dial gauge:
4. Remove the timing belt upper cover
5. Note: The gauge bar placed on the cam base circle of the cam for cylinder 1

6. Check the belt(s) for cracks, fraying, wear and oil contamination
7. Turn the camshaft clockwise
8. Until the gauge reads
9. Remove the crankshaft pulley
10. Until the gauge reads
11. Turn the injection pump gearwheel until the locking pin fits
12. Remove the right engine damper support
13. Fit the crankshaft TDC positioning tool from under the engine into the flywheel
14. Remove the valve cover
15. Turn the engine clockwise until cylinder 1 is 90° BTDC
16. Note: The cams for cylinder 1 should point straight up
17. Loosen the camshaft gearwheel bolts slightly but ensure the gearwheel can rotate freely
18. Remove the special tools
19. Remove the timing belt tensioner

Installation and checks

20. Pre-tension the timing belt
21. Turn the tensioner anti-clockwise until the pointer is positioned as shown
22. Turn the tensioner pulley clockwise until the pointer is positioned as shown
23. Tighten the camshaft gearwheel
24. Turn the engine 2 rotations by hand
25. Align the camshaft timing marks
26. Loosen the tensioner pulley bolt
27. Turn the tensioner clockwise to align both marks
28. Turn the tensioner pulley clockwise until the pointer aligns with A for a new belt and with B for a used belt
29. Tighten the tensioner
30. Turn the engine 2 rotations by hand
31. Check the timing marks again
32. Fit the crankshaft TDC positioning tool from under the engine into the flywheel
33. Turn the injection pump gearwheel until the locking pin fits
34. Fit a dial gauge
35. Check the gauge reading
36. If the value is outside the specified range
37. Restart the fitting operation
38. Remove the locking pins
39. Refit the valve cover
40. Refit the crankcase breather hose
41. Fit the right-hand engine damper support
42. Refit the timing belt lower cover
43. Fit the crankshaft pulley
44. Refit the front right wheel
45. Fit the ancillary drive belts
46. Refit the timing belt upper cover
47. Refit the air filter with the inlet hose

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