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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1353 (Engine Mechanical - 4.3L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Timing Chain and Sprockets Cleaning and Inspection

Timing Chain and Sprockets Cleaning and Inspection

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to SAFETY GLASSES CAUTION .
  1. Clean the components with cleaning solvent.
  2. Dry the components with compressed air.
  3. Inspect the camshaft timing chain for binding or wear.
    Fig 1: Timing Chain & Sprockets
    G02106273Courtesy of GENERAL MOTORS CORP.
  4. Inspect the camshaft sprocket and the crankshaft sprocket for:
    • Broken teeth (1)
    • Damaged teeth (2)
    • Chipped teeth (3)
    • Worn teeth
    • Uneven wear on the edge of the teeth
    • Worn valleys between the sprocket teeth
    • Crankshaft sprocket keyway for wear
    Fig 2: Broken Teeth, Damaged Teeth & Chipped Teeth Of Camshaft Sprocket
    G02106274Courtesy of GENERAL MOTORS CORP.
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