GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1559843  Size: SH

    Important: 

       • Note the position and direction of the engine flywheel before removal. Mark or scribe the end of the crankshaft and flywheel before component removal. The existing manual transmission engine flywheel must be installed to the original position and direction.
       • 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 3 stage tightening process.

  1. Install the flywheel to the crankshaft.
  2. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the flywheel bolts.
  3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 63174  Size: SH
  4. Install the engine flywheel bolts.
  5. 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).