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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> ENGINE MECHANICAL - 4.8L, 5.3L, AND 6.0L (4 Of 4) >> Off-Vehicle Repair Instructions (Part 3) >> Engine Flywheel Installation

Engine Flywheel Installation

    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 3 stage tightening process.
    • Certain applications, the 4.8L manual transmission and all 6.0L, require a spacer and longer bolts for proper flywheel position.
    Fig 1: View Of Spacer & Crankshaft Rear
    GM642276Courtesy of GENERAL MOTORS CORP.
  1. Install the spacer, if applicable, onto the rear of the crankshaft.

    A longer flywheel bolt must be used on applications using a flywheel spacer.

  2. Install the manual transmission engine flywheel to the crankshaft, if applicable.
    Fig 2: View Of Engine Flywheel & Bolts (Manual Transmission)
    GM156166Courtesy of GENERAL MOTORS CORP.
  3. Install the automatic transmission flex plate to the crankshaft, if applicable.
    Fig 3: View Of Engine Flywheel & Bolt
    GM178458Courtesy of GENERAL MOTORS CORP.
    4. IMPORTANT: A longer flex plate bolt must be used on applications using a flex plate spacer.
  4. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the bolts.
    5. NOTE: Refer to Fastener Notice .
    Fig 4: Identifying Flywheel Bolt Tightening Sequence
    GM63174Courtesy of GENERAL MOTORS CORP.
  5. Install the bolts.

    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).

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