Timing chain replacement: Toyota Aygo 1.0 (1KR-FE)

🧭 Before you start

Fits: platform codes 1.0, VVT-I

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

Don't miss

• Align the yellow plate on the timing chain with the mark on the crankshaft gearwheel
• Align the orange plate(s) on the timing chain with the mark on the camshaft(s) gearwheel

🔧 Engine codes this applies to

📐 21 workshop diagrams for 1KR-FE

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

📋 Procedure

Preparation and removal

1. Unless otherwise advised by the manufacturer, the following procedures are recommended:
2. Drain the engine oil
3. Align the yellow plate on the timing chain with the mark on the crankshaft gearwheel
4. Align the orange plate(s) on the timing chain with the mark on the camshaft(s) gearwheel
5. Remove the ancillary drive belt

6. Remove the oil sump
7. Timing chain lower cover
8. Remove the engine together with the gearbox
9. Remove the alternator
10. Remove the dipstick tube
11. Remove the dipstick O-ring
12. Disconnect the camshaft position sensor(s)
13. Remove the crankshaft position sensor
14. Remove the valve cover
15. Remove the oil filter housing
16. Remove the coolant pump
17. Turn the crankshaft clockwise
18. Align the crankshaft timing marks
19. Remove the camshaft cover
20. Check the camshaft timing marks
21. If necessary
22. Turn the crankshaft by 1 turn
23. Use the special tools to remove the crankshaft pulley
24. Remove the timing chain cover
25. Lock the tensioner; use a locking pin
26. Remove the chain tensioner
27. Remove the chain tensioner rail(s)
28. Remove the timing chain
29. Turn the camshaft slightly anti-clockwise to slacken the chain at the tensioner side

Installation and checks

30. Fit the chain tensioner
31. Compress the tensioner
32. Remove the tensioner locking pin
33. Turn the crankshaft clockwise 2 rotations
34. Release the tensioner pressure
35. Check the camshaft timing marks
36. Camshaft cover:
37. Check and renew if necessary
38. Refit the camshaft cover
39. Fit the crankshaft oil seal
40. Use the special tool
41. Clean off the sealing surfaces
42. Refit the timing chain cover
43. Note: Apply sealant before fitting
44. Tighten the bolts in a criss-cross pattern, starting from the centre
45. Bolts:
46. Bolts:
47. Coolant pump:
48. Renew the gasket
49. Refit the coolant pump
50. Use the special tools to refit the crankshaft pulley
51. Refit the oil filter housing
52. Refit the valve cover
53. Refit the crankshaft position sensor
54. Reconnect the crankshaft position sensor
55. Refit the dipstick O-ring
56. Lubricate before fitting
57. Refit the dipstick tube
58. Refit the alternator
59. Refit the engine together with the gearbox
60. Refit the front drive shafts
61. Refit the engine lower cover
62. Refit the ancillary drive belt
63. Refill the engine oil
64. Refill the gearbox oil
65. Refill the cooling system

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