GM Service Manual Online
For 1990-2009 cars only

    Object Number: 188086  Size: SH

    Important: In order to maintain the proper component balance, contact surface taper, and heat transfer, manual transmission flywheels are NOT to be machined.

  1. Clean the flywheel in solvent.
  2. Caution: Refer to Safety Glasses Caution in the Preface section.

  3. Dry the flywheel with compressed air.
  4. Inspect the manual transmission flywheel for the following conditions:
  5. • Pitted surfaces (1)
    • Grooves or scoring (2)
    • Rusted surface (3)
    • Damaged ring gear teeth (4)
    • Loose or improperly positioned ring gear
    • The ring gear has an interference fit onto the flywheel and should be positioned completely against the flange of the flywheel.
    • Missing, bent, or damaged pressure plate locating pins
    • The 2 locating pins are installed into the flywheel and spaced 170 degrees apart.

    Object Number: 178458  Size: SH
  6. Inspect the automatic transmission flywheel for the following conditions:
  7. • Damaged ring gear teeth
    • Stress cracks around the flywheel-to-crankshaft bolt hole locations

       Important: Do not attempt to repair the welded areas that retain the ring gear to the flywheel plate. Install a new flywheel.

    • Welded areas that retain the ring gear onto the flywheel for cracking