Chevrolet Sonic Repair Manual: Crankshaft Balancer Replacement

Special Tools

• EN-470–B Angular Torque Wrench
• EN-49979 Crankshaft Shock Mount Retainer

For equivalent regional tools, refer to Special Tools.

Removal Procedure

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Remove front wheelhouse liner extension right side. Refer to Front Wheelhouse Liner Inner Front Extension Replacement.
3. Remove the drive belt. Refer to Drive Belt Replacement.
4. Place collecting basin underneath.



Note:

The crankshaft balancer can be incorrectly installed 180° from the required position. Be sure to note the location of the alignment hole on the crankshaft balancer prior to removing the crankshaft balancer from the engine.

5. Rotate the engine clockwise until the bore (2) in the crankshaft balancer aligns with the mark (1) on the engine front cover.


6. Install EN-49979 crankshaft shock mount retainer (1) to suitable tool (2).
7. Loosen the crankshaft balancer bolt (4) while holding the crankshaft balancer (3).


8. Remove and DISCARD the crankshaft balancer bolt (2).
9. Remove the crankshaft balancer (1).

Installation Procedure

Note:

The crankshaft balancer flange must fit to the hexagon of the oil pump rotor (2) and to the two-flats of the crankshaft (1). The TDC markings on crankshaft balancer and engine front cover must match.

1. Install the crankshaft balancer carefully by pressing into position.


2. Measure the distance (a) between the crankshaft balancer (2) and the mark on the engine front cover (1). The distance (a) should be  5.5 mm (0.21654 in)

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Note:

Never re-use the crankshaft balancer bolt.

3. Install a NEW crankshaft balancer bolt.



Caution:

Refer to Fastener Caution.

Caution:

Refer to Torque-to-Yield Fastener Caution.

4. Tighten the crankshaft balancer bolt (4) to 150 N•m (111 lb ft) while holding the crankshaft balancer (3) with EN-49979 crankshaft shock mount retainer (1) and suitable tool (2). Use EN-470-B wrench .
5. Tighten the crankshaft balancer bolt to an additional  60°

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6. Install the drive belt. Refer to Drive Belt Replacement.
7. Install the front wheelhouse liner extension right side. Refer to Front Wheelhouse Liner Inner Front Extension Replacement.
8. Lower the vehicle.
9. Check and correct engine oil level.