Engine Flywheel Installation 5.3L

Important: The flex plate does not use a locating pin for alignment and will not initially seat against the crankshaft flange, but will be pulled onto the crankshaft by the engine flex plate bolts. This procedure requires a 3 stage tightening process.

1. Install the flex plate to the crankshaft.
2. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the flex plate bolts.

Notice: Refer to Fastener Notice in the Preface section.




3. Install the engine flex plate bolts.

Tighten

1. Tighten the engine flex plate bolts (1-6) a first pass in sequence to 20 N·m (15 lb ft).
2. Tighten the engine flex plate bolts (1-6) a second pass in sequence to 50 N·m (37 lb ft).
3. Tighten the engine flex plate bolts (1-6) a final pass in sequence to 100 N·m (74 lb ft).

Engine Flywheel Installation 6.0L

Important: The flywheel and flex plate do not use a locating pin for alignment and will not initially seat against the crankshaft flange, but will be pulled onto the crankshaft by the bolts. This procedure requires a 3-stage tightening process.

1. Install the automatic transmission flex plate to the crankshaft, if applicable.



2. Install the manual transmission flywheel to the crankshaft, if applicable.
3. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the bolts.

Notice: Refer to Fastener Notice in the Preface section.




4. Install the engine flywheel bolts (1-6).

Tighten

1. Tighten the engine flywheel bolts (1-6) a first pass in sequence to 20 N·m (15 lb ft).
2. Tighten the engine flywheel bolts (1-6) a second pass in sequence to 50 N·m (37 lb ft).
3. Tighten the engine flywheel bolts (1-6) a final pass in sequence to 100 N·m (74 lb ft).