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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 719 (ENGINE MECHANICAL - 3.8L (UNIT REPAIR))REPAIR INSTRUCTIONSTIMING CHAIN AND SPROCKETS REMOVAL (L36)
1999 GMC Forward Control 5.7 R, Automatic

Timing Chain and Sprockets Removal (L36)

1999 GMC Forward Control 5.7 R, AutomaticSECTION Timing Chain and Sprockets Removal (L36)
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Align the timing marks on the sprockets.
    Fig 1: Align Timing Marks On Sprockets
    G01703544Courtesy of GENERAL MOTORS CORP.
  2. Remove the timing chain dampener.
    Fig 2: Timing Chain Dampener
    G01703545Courtesy of GENERAL MOTORS CORP.
  3. Remove the camshaft sprocket bolt.
  4. Remove the camshaft sprocket.
  5. Remove the timing chain.
  6. Remove the crankshaft sprocket.
  7. Remove the crankshaft balancer key.
    Fig 3: Camshaft Sprocket, Bolt, Timing Chain, Crankshaft Sprocket & Balancer Key
    G01703546Courtesy of GENERAL MOTORS CORP.
  8. Remove the balance shaft drive gear.
    Fig 4: Balance Shaft Drive Gear
    G01703547Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.