Chevrolet Sonic Repair Manual: Timing Belt Replacement

Special Tools

• EN-6333 Timing Belt Tensioner Locking Pin
• EN-6340 Camshaft Locking Tool

For equivalent regional tools, refer to Special Tools.

Removal Procedure

Note:

If the timing belt is being replaced due to the maintenance schedule interval, then the timing belt tensioner and idler pulley must also be replaced.

1. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
2. Remove the timing belt upper front cover. Refer to Timing Belt Upper Front Cover Replacement.
3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
4. Remove the front wheelhouse liner Inner front extension. Refer to Front Wheelhouse Liner Inner Front Extension Replacement.
5. Remove the drive belt tensioner. Refer to Drive Belt Tensioner Replacement.



6. Set crankshaft balancer in direction of engine rotation to cylinder 1 TDC of combustion stroke (1).


7. Remove the crankshaft balancer bolt (1).
8. Remove the crankshaft balancer (2). Refer to Crankshaft Balancer Replacement.

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9. Remove the 4 lower timing belt cover bolts (2).
10. Remove the lower timing belt cover (1).



Note:

The right half of the EN-6340 locking tool can be recognized by the lettering "right", arrow, on the tool.

11. Prepare the right half of the EN-6340 locking tool.
1. Remove the 2 bolts (2).
2. Remove the front panel (1) from the EN-6340-right locking tool.



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

Note:

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

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

Note:

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

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



13. Apply tension to the timing belt tensioner (2) in the direction of the arrow, using an Allen key (1).
14. Install the EN-6333 locking pin(3).




Note:

Note the direction of the belt.

15. Remove the timing belt (1).

Installation Procedure

Note:

Threading the timing belt through the engine mount bracket is only permissible in conjunction with the assembly tool supplied with NEW timing belts or otherwise it is possible to damage the toothed belt at this stage by kinking it.

1. Install the timing belt (1).
2. Guide the timing belt past the tensioner and place it on the crankshaft sprocket wheel.
3. Place the timing belt on the exhaust and intake camshaft position actuator adjusters.


4. Apply tension to the timing belt tensioner (2) in the direction of the arrow, using an Allen key (1).
5. Remove the EN-6333 locking pin (3).




Note:

The timing belt tensioner moves automatically to the correct position.

6. Check the timing.

Note:

Note the marking at the camshaft sprockets.

1. Turn the crankshaft 720 degrees in the direction of engine rotation by the bolt on the crankshaft balancer.

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 slightly above as shown.

2. Install EN-6340-left locking tool (1) into 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.

3. Install EN-6340-right locking tool (2) into the camshaft position actuator adjusters as shown.
7. Remove the EN-6340 locking tool.




Note:

The timing belt drive gear and oil pump housing must align.

8. Control the crankshaft balancer position.
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9. Install the lower timing belt cover (1).

Caution:

Refer to Fastener Caution.

10. Install the 4 lower timing belt cover bolts (2) and tighten to 6 Y (53 lb in)

    .




11. Install the crankshaft balancer (2). Refer to Crankshaft Balancer Replacement if necessary.
12. Install the crankshaft balancer bolt (1) and tighten to 95 Y (70 lb ft) plus 30 degrees plus 15 degrees

    .

13. Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement.
14. Install the front wheelhouse liner Inner front extension. Refer to Front Wheelhouse Liner Inner Front Extension Replacement.
15. Install the timing belt upper front cover. Refer to Timing Belt Upper Front Cover Replacement.
16. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.

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