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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 4.3L (Unit Repair) >> Repair Instructions >> Timing Chain and Sprockets Cleaning and Inspection

Timing Chain and Sprockets Cleaning and Inspection

CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
  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: Camshaft Timing Chain
    G01660435Courtesy 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: Camshaft Sprocket Inspection Areas
    G01660436Courtesy of GENERAL MOTORS CORP.
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