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Harmonic Balancer - Crankshaft Pulley: Service and Repair



Crankshaft Balancer Replacement

Special Tools

- Insert new tool J 44226-1 Crankshaft Balancer Remover/Holder
- EN-48034 Harmonic Balancer Installer
- J 41816-A Crankshaft Balancer Remover
- J 41816-2 Crankshaft End Protector
- J 45059 Torque Angle Meter


Removal Procedure

1. Remove the radiator.
2. Remove the drive belt.

Important: When removing the diagonal brace, only remove the one bolt from the battery tray brace that is bolted to the radiator brace.





3. Carefully loosen and remove the balancer bolt. Discard the bolt.





4. Remove the service slot plug.
5. Lower the vehicle.





6. Install J 41816-2 and J 41816-A to the balancer.

Important: Do not pull on outer edge of the crankshaft balancer.

7. Remove the crankshaft balancer.
8. Remove the puller and the J 41816-A.
9. Remove the crankshaft balancer shim from the crankshaft snout.
10. Clean and inspect the crankshaft balancer.

Installation Procedure

Important: The crankshaft balancer does not have a key-way; so the crankshaft could turn when tightening, causing an improper torque. Make sure to follow the installation procedure to prevent damage.





1. Raise the vehicle. Refer to Vehicle Lifting.
2. Install a new crankshaft balancer shim. For 2003 and first design 2004 use GM P/N 12573950 over the crankshaft snout, against the crankshaft gear.

For second design 2004 and after use GM P/N 12578073. Service replacement balances will come with the correct shim.

3. Using the EN-48034 install and seat the crankshaft balancer.
4. Remove the EN-48034.
5. Install J 44226-1 to hold the balancer from turning.





NOTICE: Refer to Fastener Notice in Service Precautions.
Fastener Notice

6. While still holding the flywheel, install the balancer washer and a new bolt.

Tighten the crankshaft balancer bolt to 150 Nm (110 ft. lbs.). Use the J 45059 in order to tighten the balancer bolt an additional 180°.

7. Remove the torque converter holding tool.





8. Install the torque converter access plug into the oil pan.
9. Lower the vehicle.
10. Install the drive belt.
11. Install the radiator.

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