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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Timing Chain and Sprockets Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  2. Remove the crankshaft position sensor reluctor ring.
    Fig 1: Removing Crankshaft Position Sensor Reluctor Ring
    G02077837Courtesy of GENERAL MOTORS CORP.
    CAUTION: In order to rotate the engine install a bolt with the same threads as the crankshaft, but do not use the crankshaft balancer bolt or a bolt longer than 1 inch, in the crankshaft. Failing to do so will cause damage to the bolt threads and the crankshaft threaded hole when removing the bolt.
  3. Install a 7/16-20 x 1 inch bolt into the end of the crankshaft.
    CAUTION: Align the timing marks before removing the timing chain. If it is necessary to turn either the camshaft or the crankshaft with the timing chain removed, loosen or remove the valve rocker arms. Turning either the crankshaft or camshaft with the timing chain removed may cause the pistons to contact the valves, resulting in damage.
  4. Rotate the crankshaft until:
    1. The timing marks on both sprockets line up.
    2. The number four cylinder is at top dead center (TDC) of the compression stroke.
      Fig 2: Aligning Timing Marks
      G02077838Courtesy of GENERAL MOTORS CORP.
  5. Remove the camshaft sprocket bolts.
    Fig 3: Removing Camshaft Sprocket Bolts
    G02077839Courtesy of GENERAL MOTORS CORP.
  6. Remove the camshaft sprocket and the camshaft timing chain.
    Fig 4: Removing Camshaft Sprocket & Camshaft Timing Chain
    G02077840Courtesy of GENERAL MOTORS CORP.
    WARNING: Wear safety glasses in order to avoid eye damage.
  7. Remove the crankshaft sprocket using the J 5825-A  .
    Fig 5: Removing Crankshaft Sprocket Using J 5825-A
    G02077841Courtesy of GENERAL MOTORS CORP.
  8. Remove the crankshaft balancer key.
  9. Clean and inspect the timing chain and sprockets. Refer to Timing Chain and Sprockets Cleaning and Inspection .
    Fig 6: Removing Crankshaft Balancer Key
    G02077842Courtesy of GENERAL MOTORS CORP.
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