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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 Removal

Timing Chain and Sprockets Removal

Tools Required 

J 5825-A  Crankshaft Gear Remover

  1. Remove the crankshaft position sensor reluctor ring.
    Fig 1: Crankshaft Position Sensor Reluctor Ring
    G01660327Courtesy of GENERAL MOTORS CORP.
  2. Check the camshaft timing chain free play.
    1. 2.1. Rotate the camshaft sprocket (1) counterclockwise until all slack is removed from the camshaft timing chain (2).
    2. 2.2. Measure the free play on the slack side (3) of the camshaft timing chain.

      If the camshaft timing chain can be moved side to side in excess of 11 mm (0.43 in), replacement of the camshaft timing chain and the sprockets is recommended during assembly.

    Fig 2: Checking Camshaft Timing Chain Free Play
    G01660328Courtesy of GENERAL MOTORS CORP.
  3. Remove the camshaft sprocket bolts.
    Fig 3: Camshaft Sprocket Bolt
    G01660329Courtesy of GENERAL MOTORS CORP.
  4. Remove the camshaft sprocket and the camshaft timing chain.
    Fig 4: Camshaft Sprocket & Timing Chain
    G01660330Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
  5. Remove the crankshaft sprocket using the J 5825-A  .
    Fig 5: Removing Crankshaft Sprocket Using J 5825-A
    G01660331Courtesy of GENERAL MOTORS CORP.
  6. Remove the crankshaft balancer key.
    Fig 6: Crankshaft Balancer Key
    G01660332Courtesy of GENERAL MOTORS CORP.