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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 516 (Engine Mechanical - 4.3L (LU3)) >> 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 Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. 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
    G01977562Courtesy of GENERAL MOTORS CORP.
    NOTE: 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.
    NOTE: 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. 4.1. The timing marks on both sprockets line up.
    2. 4.2. The number four cylinder is at top dead center (TDC) of the compression stroke.
      Fig 2: Proper Alignment of Timing Marks
      G01977563Courtesy of GENERAL MOTORS CORP.
  5. Remove the camshaft sprocket bolts.
    Fig 3: Removing Camshaft Sprocket Bolts
    G01977564Courtesy of GENERAL MOTORS CORP.
  6. Remove the camshaft sprocket and the camshaft timing chain.
    Fig 4: Removing Camshaft Sprocket & Timing Chain
    G01977565Courtesy of GENERAL MOTORS CORP.
  7. Remove the crankshaft sprocket using the J 5825-A  .
    Fig 5: Removing J 5825-A
    G01977566Courtesy of GENERAL MOTORS CORP.
  8. Remove the crankshaft balancer key.
    Fig 6: Removing Crankshaft Balancer Key
    G01977567Courtesy of GENERAL MOTORS CORP.
  9. Clean the components with cleaning solvent.
  10. Dry the components with compressed air.
  11. Inspect the camshaft timing chain for binding or wear.
    Fig 7: Cleaning Camshaft Timing Chain
    G01977568Courtesy of GENERAL MOTORS CORP.
  12. 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 8: Inspecting Camshaft & Crankshaft Sprockets
      G01977569Courtesy of GENERAL MOTORS CORP.
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