Engine Flywheel Cleaning and Inspection

CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.

Clean the engine flywheel (1 or 2) in cleaning solvent.
Dry the engine flywheel with compressed air.

Fig 1: Engine Flywheels (Automatic & Manual Transmission)
Courtesy of GENERAL MOTORS CORP.

Important: Do not attempt to repair the welded areas, if present, that retain the ring gear to the engine flywheel plate. Always install a NEW engine flywheel.
Inspect the engine flywheel, automatic transmission, if equipped, for the following:
- Stress cracks around the engine flywheel-to-torque converter bolt hole locations (1)
- Missing balance weights
- Stress cracks around the engine flywheel-to-crankshaft bolt hole locations (2 or 3)
- Welded areas that retain the ring gear onto the engine flywheel for cracking (4), if present
- Damaged ring gear teeth (5)
Fig 2: Engine Flywheel Inspection Areas (Automatic Transmission)
Courtesy of GENERAL MOTORS CORP.
Inspect the engine flywheel, manual transmission, if equipped, for loose or improperly installed flywheel weights, if applicable.
A properly installed flywheel weight should be installed until flush or below flush with the face of the engine flywheel.

Fig 3: Engine Flywheel & Weights (Manual Transmission)
Courtesy of GENERAL MOTORS CORP.
Inspect the engine flywheel, manual transmission, if equipped, for the following:
- Pitted friction surface (1)
- Scoring or grooves (2)
- Rust or other surface damage (3)
- Damaged ring gear teeth (4)
- Loose or improperly positioned ring gear
  The ring gear has an interference fit onto the engine flywheel and the ring gear should be positioned completely flat against the flange of the engine flywheel.
Fig 4: Engine Flywheel Inspection Areas (Manual Transmission)
Courtesy of GENERAL MOTORS CORP.