Special Tools

1. Remove the radiator. Refer to Radiator Replacement.
2. Remove the drive belt. Refer to Drive Belt Replacement.



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



4. Remove the service slot plug.




Important: The crankshaft balancer does not have a key-way, and the crankshaft could turn when tightening, causing the improper torque.

5. Install the EN 46547  (1) into the flywheel teeth.
6. Lower the vehicle.



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

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

8. Remove the crankshaft balancer.
9. Remove the puller and the J 41816-A .
10. Remove the crankshaft balancer shim from the crankshaft snout.
11. Clean and inspect the crankshaft balancer. Refer to Crankshaft Balancer Cleaning and Inspection.

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 Lifting and Jacking the Vehicle.
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 .

Notice: Refer to Fastener Notice in the Preface section.




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

Tighten
Tighten the crankshaft balancer bolt to 150 N·m (110 lb ft). Use the J 45059 in order to tighten the balancer bolt an additional 180 degrees.

6. Remove the torque converter holding tool.



7. Install the torque converter access plug into the oil pan.
8. Lower the vehicle.
9. Install the drive belt. Refer to Drive Belt Replacement.
10. Install the radiator. Refer to Radiator Replacement.