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Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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 (4.8 L manual transmissions or all 6.0 L) require a spacer and longer bolts for proper flywheel position.
  1. Install the spacer (if applicable) onto the rear of the crankshaft.
    Fig 1: Installing Spacer
    G02106812Courtesy of GENERAL MOTORS CORP.
  2. Install the manual transmission engine flywheel to the crankshaft, if applicable.
    Fig 2: Installing M/T Engine Flywheel
    G02106813Courtesy of GENERAL MOTORS CORP.
  3. Install the automatic transmission engine flywheel to the crankshaft, if applicable.
    IMPORTANT: Longer flywheel bolts must be used on applications using a flywheel spacer.
  4. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads of the flywheel bolts.
    Fig 3: Installing A/T Engine Flywheel
    G02106814Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .
  5. Install the engine flywheel bolts.

    Tighten 

    1. 5.1. Tighten the bolts a first pass in sequence to 20 N.m (15 lb ft).
    2. 5.2. Tighten the bolts a second pass in sequence to 50 N.m (37 lb ft).
    3. 5.3. Tighten the bolts a final pass in sequence to 100 N.m (74 lb ft).
  6. Install the clutch, if equipped with a manual transmission. Refer to CLUTCH ASSEMBLY REPLACEMENT .
  7. Install the automatic transmission, if equipped. Refer to TRANSMISSION REPLACEMENT (4L60-E) or TRANSMISSION REPLACEMENT (4L80-E) .
    Fig 4: Tightening Sequence For Engine Flywheel Bolts
    G02106815Courtesy of GENERAL MOTORS CORP.
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