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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 (2 Of 4) >> On-Vehicle Repair Instructions >> Engine Flywheel Replacement >> Installation Procedure

Installation Procedure

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 three stage tightening process.
  • Certain applications (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.
    2. Fig 2: View Of Engine Flywheel & Bolts
    GM832979Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Longer flywheel bolts must be used on applications using a flywheel spacer.
  2. Install the flywheel and bolts to the crankshaft.
  3. Apply threadlock GM P/N 12345382, (Canadian P/N 10953489) or equivalent to the threads of the flywheel bolts.
    4. NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
    Fig 3: Identifying Flywheel Bolt Tightening Sequence
    GM63174Courtesy of GENERAL MOTORS CORP.
  4. Tighten the flywheel bolts.

    Tighten: 

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

  5. Install the automatic transmission. Refer to Transmission Replacement (4.3, 4.8L, 5.3L, and 6.0L Engines) or Transmission Replacement (5.3L Engine w/RPO HP2) in Automatic Transmission - 4L60-E or Transmission Replacement in Automatic Transmission - 4L80-E.
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