Engine Flywheel Installation

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Important:

The flywheel does not use a locating pin for alignment, and will not initially seat against the crankshaft flange or spacer, if applicable, but will be pulled onto the crankshaft by the engine flywheel bolts. This procedure requires a three stage tightening process.
Certain applications, the 4.8 L manual transmission and all 6.0 L, require a spacer and longer bolts for proper flywheel position.

Install the spacer, if applicable, onto the rear of the crankshaft.
A longer flywheel bolt must be used on applications using a flywheel spacer.

Fig 1: Flywheel Spacer
Courtesy of GENERAL MOTORS CORP.
Install the manual transmission engine flywheel to the crankshaft, if applicable.

Fig 2: Manual Transmission Engine Flywheel
Courtesy of GENERAL MOTORS CORP.
Install the automatic transmission engine flywheel to the crankshaft, if applicable.
IMPORTANT: A longer flywheel bolt must be used on applications using a flywheel spacer.
Apply threadlock GM P/N United States 12345382, GM P/N Canada 10953489, or equivalent, to the threads of the flywheel bolts.

Fig 3: Automatic Transmission Engine Flywheel
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the engine flywheel bolts.
Tighten
1. 5.1. Tighten the engine flywheel bolts first pass in sequence to 20 N.m (15 lb ft).
2. 5.2. Tighten the engine flywheel bolts second pass in sequence to 50 N.m (37 lb ft).
3. 5.3. Tighten the engine flywheel bolts final pass in sequence to 100 N.m (74 lb ft).
Fig 4: Engine Flywheel Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.