GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Holden 🢒 2009 🢒 WM Sedan 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Engine Flywheel Installation

Engine Flywheel Installation L98, LS2


    Object Number: 1950986 Size: SH

    Important: The flexplate (1) will not initially seat against the crankshaft flange, but will be pulled onto the crankshaft by the flexplate to crankshaft retaining bolts (2). This procedure requires a 3 stage tightening process.

  1. Install the flexplate (1).

    2. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1950869 Size: SH

    Important: Make sure the teeth of the J 42386-A J 42386-A (1) engage correctly with the ring gear teeth, before tightening the flexplate bolts.

  2. Install the J 42386-A J 42386-A (1), using the two starter motor to cylinder block retaining bolts (2).

    3. Object Number: 1950984 Size: SH
  3. Install the NEW flexplate to crankshaft retaining bolts.

    4. Tighten

        • Tighten a first pass in sequence to 20 N·m (15 lb ft).
        • Tighten a second pass in sequence to 50 N·m (37 lb ft).
        • Tighten a final pass in sequence to 100 N·m (74 lb ft).

Engine Flywheel Installation LS3


    Object Number: 64123 Size: SH

    Important: 

       • For manual transmission applications, 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.
       • Do not remove the propeller shaft hub or flex plate from the automatic transmission flex plate assembly. The flex plate and propeller shaft hub are balanced as an assembly. If service is required, the entire flex plate assembly should be replaced.

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

    2. Object Number: 506140 Size: SH
  2. Install the manual transmission flywheel to the crankshaft, if applicable. Refer to Engine Balancing.
  3. Apply threadlock Loctite 242™, or equivalent, to the threads of the bolts.

    4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 63174 Size: SH
  4. Install the bolts.

    5. Tighten

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