GM Service Manual Online
For 1990-2009 cars only

    Object Number: 156166  Size: SH

    Important: Note the position and direction of the engine flywheel before removal. The flywheel 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 flywheel bolts. This procedure requires a three stage tightening process.

  1. Install the manual transmission engine flywheel to the crankshaft, if applicable.

  2. Object Number: 178458  Size: SH
  3. Install the automatic transmission engine flywheel to the crankshaft, if applicable.

  4. Object Number: 63174  Size: SH
  5. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the flywheel bolts.
  6. Notice: Refer to Fastener Notice in the Preface section.

  7. Install the engine flywheel bolts.
  8. Tighten

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