Engine Flywheel Replacement Automatic Transmission

1. Remove the transmission. Refer to Transmission Replacement in Automatic Transmission - 4L80-E, or 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 Engine Mechanical - 8.1 L Unit Repair.

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

1. Install the engine flywheel.

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.

2. Install the engine flywheel bolts.

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).
3. Install the transmission. Refer to Transmission Replacement in Automatic Transmission - 4L80-E, or Transmission Replacement in Automatic Transmission - Allison.

Engine Flywheel Replacement Manual Transmission

1. Remove the clutch assembly. Refer to Clutch Assembly Replacement in Clutch.
2. Remove the engine flywheel bolts.

Important: The engine flywheel may need to be tapped with a non-metallic mallet from the engine side due to a slight interference fit to the crankshaft.

3. Remove the engine flywheel.
4. Clean and inspect the engine flywheel. Refer to Engine Flywheel Cleaning and Inspection in Engine Mechanical - 8.1 L Unit Repair.

1. Install the engine flywheel.

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.

2. Install the engine flywheel bolts.

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).
3. Install the clutch assembly. Refer to Clutch Assembly Replacement in Clutch.