GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN 46547 Flywheel Holding Tool
    • 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. Refer to Radiator Replacement.
  2. Remove the drive belt. Refer to Drive Belt Replacement.

  3. Object Number: 856226  Size: SH
  4. Carefully loosen and remove the balancer bolt. Discard the bolt.

  5. Object Number: 856226  Size: SH
  6. Remove the service slot plug.

  7. Object Number: 1386661  Size: SH

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

  8. Install the EN 46547  (1) into the flywheel teeth.
  9. Lower the vehicle.

  10. Object Number: 869916  Size: SH
  11. Install J 41816-2 and J 41816-A to the balancer.
  12. Note: Do not pull on outer edge of the crankshaft balancer.

  13. Remove the crankshaft balancer.
  14. Remove the puller and the J 41816-A .
  15. Remove the crankshaft balancer shim from the crankshaft snout.
  16. Clean and inspect the crankshaft balancer. Refer to Crankshaft Balancer Cleaning and Inspection.

Installation Procedure

    Note: 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 GM P/N 12578073 over the crankshaft snout, against the crankshaft gear.
  3. A new balance will include a shim.


    Object Number: 856229  Size: SH
  4. Using the EN-48034 install and seat the crankshaft balancer.
  5. Remove the EN-48034 .
  6. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 856226  Size: SH
  7. While still holding the flywheel, install the balancer washer and a new bolt and tighten to 150 N·m (110 lb ft). Use the J 45059 in order to tighten the balancer bolt an additional 180 degrees.
  8. Remove the torque converter holding tool.

  9. Object Number: 1302113  Size: SH
  10. Install the torque converter access plug into the oil pan.
  11. Lower the vehicle.
  12. Install the drive belt. Refer to Drive Belt Replacement.
  13. Install the radiator. Refer to Radiator Replacement.