GM Service Manual Online
For 1990-2009 cars only

Engine Flywheel Cleaning and Inspection LWB

Automatic Transmission

    Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 1950982  Size: SH
  1. Clean the automatic transmission flex plate in solvent.
  2. Dry the flex plate with compressed air.
  3. Important: Do not attempt to repair the welded areas that retain the ring gear to the flex plate. If any of the following conditions are found, install a new flex plate.

  4. Inspect the flex plate for the following conditions:
  5. • Damaged ring gear teeth (1).
    • Elongations of the crankshaft or torque converter bolt holes (2).
    • Stress cracks around the flex plate-to-crankshaft retaining bolt hole locations (3).
    • Cracks between the pressing holes (4).
    • Welded areas that retain the ring gear onto the flex plate for cracking.

Engine Flywheel Cleaning and Inspection SWB

Automatic Transmission

    Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 1950982  Size: SH
  1. Clean the automatic transmission flex plate in solvent.
  2. Dry the flex plate with compressed air.
  3. Important: Do not attempt to repair the welded areas that retain the ring gear to the flex plate. If any of the following conditions are found, install a new flex plate.

  4. Inspect the flex plate for the following conditions:
  5. • Damaged ring gear teeth (1).
    • Elongations of the crankshaft or torque converter bolt holes (2).
    • Stress cracks around the flex plate-to-crankshaft retaining bolt hole locations (3).
    • Cracks between the pressing holes (4).
    • Welded areas that retain the ring gear onto the flex plate for cracking.

Manual Transmission

    Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 1950983  Size: SH
  1. Clean the manual transmission flywheel in solvent.
  2. Dry the flywheel with compressed air.
  3. Important: Do not attempt to repair the welded areas that retain the ring gear to the flywheel. If any of the following conditions are found, install a new flywheel.

  4. Inspect the flywheel for the following conditions:
  5. • Pitted surfaces (4)
    • Grooved or scored surface (2)
    • Rusted surface (3)
    • Damaged ring gear teeth (1)
    • Loose or incorrectly 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 to ensure correct orientation of the clutch pressure plate to the engine flywheel during assembly.