Chevrolet Sonic Repair Manual: Camshaft Sprocket Replacement

Special Tools

• EN-6340 Camshaft Adjuster Locking Tool
• EN-6628–A Camshaft Locking Tool
• EN-45059 Angle Meter

For equivalent regional tools, refer to Special Tools.

Removal Procedure

1. Open the hood.
2. Remove the air cleaner housing. Refer to Air Cleaner Assembly Replacement.
3. Remove the camshaft cover. Refer to Camshaft Cover Replacement.
4. Remove the drive belt tensioner. Refer to Drive Belt Tensioner Replacement.
5. Remove the timing belt. Refer to Timing Belt Replacement.
6. Remove the timing belt idler pulley. Refer to Timing Belt Idler Pulley Removal.



7. Set the crankshaft in direction of engine rotation to 60°

   (a) before TDC. Use the EN-45059 meter and the crankshaft balancer bolt.

8. Remove the crankshaft sprocket. Refer to Crankshaft Sprocket Removal.
9. Lower the vehicle.
10. Remove the engine mount bracket. Refer to Engine Mount Bracket Replacement.



11. Remove the center front timing belt cover from the rear timing belt cover at 2 locations.
12. Remove the center front timing belt cover (1).


13. Remove the tensioner bolt (1).
14. Remove the timing belt tensioner (2).



Note:

Note the arrows.

15. Turn the camshaft by the hexagon until the groove on the end of the camshafts is horizontal.


16. Install the EN-6628–A locking tool (1).
17. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.

Note:

Some engine oil will run out of the camshaft and the camshaft position actuator adjuster. That is the reason for the removal of the whole timing assembly.

18. Place a collecting basin underneath the vehicle.


19. Remove the camshaft position actuator adjuster closure bolt (1) of the intake camshaft position actuator adjuster and/or the exhaust camshaft position actuator adjuster (3).
20. Remove and DISCARD the intake camshaft position actuator adjuster bolt and/or the exhaust camshaft position actuator adjuster bolt (2).

Note:

A second person is required. Counterhold against the hexagon of corresponding camshaft with an open-ended wrench.

21. Remove the intake camshaft position actuator adjuster and/or the exhaust camshaft position actuator adjuster (3) With Sleeve (4).

Installation Procedure

Note:

If the cover is contaminated with oil, you have to clean it close.

Note:

A second person is required. Counterhold against the hexagon of corresponding camshaft with an open-ended wrench.

1. Install intake camshaft position actuator adjuster and/or the exhaust camshaft position actuator adjuster (3) with sleeve (4).
2. Install a NEW intake camshaft position actuator adjuster bolt and/or a NEW exhaust camshaft position actuator adjuster bolt (2).


3. Install the EN-6340 locking tool into the camshaft position actuator adjusters.

Note:

The spot type marking (4) on the intake camshaft position actuator adjuster does not correspond to the groove of EN-6340-left during this process but must be somewhat above as shown.

1. Install the EN-6340-left locking tool (1) in the camshaft position actuator adjusters as shown.

Note:

The spot type marking (3) on the exhaust camshaft position actuator adjuster must correspond to the groove on EN-6340-right.

2. Install the EN-6340-right locking tool (2) in the camshaft position actuator adjusters as shown.

Caution:

Refer to Fastener Caution.

Caution:

Refer to Torque-to-Yield Fastener Caution.

Note:

A second person is required. Counterhold at the camshaft hexagon.

4. Tighten the intake camshaft position actuator adjuster or exhaust camshaft position actuator adjuster bolts to 50 Y (37 lb ft) + 150° + 15°

   use the EN-45059 meter.

Note:

Install a NEW seal ring.

5. Install camshaft closure bolt and tighten to 30 Y (22 lb ft)

   .

6. Remove the EN-6628–A locking tool.



7. Clean the timing belt tensioner thread.
8. Install the timing belt tensioner (2) and tighten the NEW timing belt tensioner bolt (1) to 20 Y (15 lb ft)

   .




9. Install the timing belt center front cover (1) to the timing belt rear cover at 2 locations.
10. Install the engine mount bracket. Refer to Engine Mount Bracket Replacement.
11. Raise the vehicle.
12. Install the crankshaft sprocket. Refer to Crankshaft Sprocket Installation.



13. Set the crankshaft in the direction of engine rotation to TDC. Use the crankshaft balancer bolt.
14. Install the timing belt idler pulley. Refer to Timing Belt Idler Pulley Installation.
15. Install the timing belt. Refer to Timing Belt Replacement.
16. Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement.
17. Install the camshaft cover. Refer to Camshaft Cover Replacement.
18. Install the air cleaner housing. Refer to Air Cleaner Assembly Replacement.
19. Close the hood.

© 2014-2025 Copyright www.csmans.com

 
0.0069