GM Service Manual Online
For 1990-2009 cars only

Engine Flywheel Replacement Manual Transmission

Removal Procedure


    Object Number: 679414  Size: SH
  1. Remove the clutch. Refer to Clutch Assembly Replacement in Clutch.
  2. Remove the engine flywheel bolts.
  3. Remove the engine flywheel.
  4. Clean and inspect the flywheel. Refer to Engine Flywheel Cleaning and Inspection in the Engine Unit Repair Manual.

Installation Procedure


    Object Number: 679414  Size: SH
  1. Install the engine flywheel.
  2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the engine flywheel bolts.
  4. Tighten

    1. Tighten the engine flywheel bolts a first pass to 80 N·m (59 lb ft).
    2. Tighten the engine flywheel bolts a final pass to 100 N·m (74 lb ft).
  5. Install the clutch. Refer to Clutch Assembly Replacement in Clutch.

Engine Flywheel Replacement Automatic Transmission

Removal Procedure


    Object Number: 470579  Size: SH
  1. Remove the transmission. Refer to Transmission Replacement in Automatic Transmission - Allison.
  2. Remove the engine flywheel bolts.
  3. Remove the engine flywheel.
  4. Clean and inspect the engine flywheel. Refer to Engine Flywheel Cleaning and Inspection in the Engine Unit Repair Manual.

Installation Procedure

Important: Make sure the flywheel is installed correctly. "Engine Side" is stamped on the flywheel to assist with installation.


    Object Number: 470579  Size: SH
  1. Install the engine flywheel.
  2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the engine flywheel bolts.
  4. Tighten

    1. Tighten the engine flywheel bolts a first pass to 80 N·m (59 lb ft).
    2. Tighten the engine flywheel bolts a second pass to 100 N·m (74 lb ft).
  5. Install the automatic transmission. Refer to Transmission Replacement in Automatic Transmission - Allison.