GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • J 24420-C Harmonic Balancer Puller
    • J 42845 Crankshaft Balancer Installer
    • J 42847 Flywheel Holding Tool

Removal Procedure


    Object Number: 470799  Size: SH
  1. Remove cooling layer. Refer to Cooling Layer Removal.
  2. Remove the drive belt. Refer to Drive Belt Replacement.
  3. Caution: Refer to Fastener Caution in the Preface section.

  4. Remove the starter motor. Refer to Starter Motor Replacement.
  5. Note: Ensure the teeth of the flywheel holding tool engage the engine flywheel teeth.

  6. Install the J 42847 to the starter bolt holes.
  7. Tighten
    Tighten the J 42847 bolts to 50 N·m (37 lb ft).


    Object Number: 677814  Size: SH
  8. Install the J 24420-C or equivalent onto the crankshaft balancer.
  9. Tighten the center screw of the J 24420-C until the crankshaft balancer is clear of the crankshaft nose.
  10. Remove the crankshaft balancer.
  11. Clean and inspect the crankshaft balancer.

Installation Procedure

Note: 

   • The balancer should be positioned onto the end of the crankshaft as straight as possible prior to tool installation.
   • Apply grease or clean engine oil to the inside of the crankshaft balancer or the end of the crankshaft, to prevent galling during assembly.


    Object Number: 639539  Size: SH
  1. Install the balancer onto the end of the crankshaft.
  2. Install J 42845  (1) to the crankshaft balancer.
  3. Note: Apply the lubricant that comes with J 42845 each time the tool is used. Failure to lubricate J 42845 may prevent the balancer from installing completely.

  4. Using J 42845 install the balancer.
  5. Tighten the J 42845 until the crankshaft balancer is completely seated against the crankshaft sprocket.

  6. Object Number: 639542  Size: SH
  7. Remove the J 42845 from the crankshaft.
  8. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 470799  Size: SH
  9. Install the crankshaft washer and bolt.
  10. Tighten
    Tighten the crankshaft balancer bolt to 225 N·m (189 lb ft).

  11. Remove the J 42847 .
  12. Install the starter motor. Refer to Starter Motor Replacement.
  13. Install the drive belt. Refer to Drive Belt Replacement.
  14. Install the cooling layer. Refer to Cooling Layer Installation.