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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1018 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Timing Chain, Sprockets, and/or Tensioner Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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.
  1. Remove the crankshaft position (CKP) sensor reluctor ring. Refer to Crankshaft Position (CKP) Reluctor Ring Replacement .
  2. Install a 7/16-20 x 1 inch bolt into the end of the crankshaft.
    3. 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.
  3. Rotate the crankshaft until:
    • The timing marks on both sprockets line up.
    • The number 4 cylinder is at top dead center (TDC) of the compression stroke.
    4. Fig 1: View Of Camshaft & Crankshaft Sprocket Timing Marks
    GM480575Courtesy of GENERAL MOTORS CORP.
  4. Unsnap the timing chain tensioner shoe from the pin (1).
    5. Fig 2: Timing Chain Tensioner Shoe
    GM1254416Courtesy of GENERAL MOTORS CORP.
  5. Remove the camshaft sprocket bolts.
    6. Fig 3: Removing Camshaft Sprocket Bolts
    GM869743Courtesy of GENERAL MOTORS CORP.
  6. Remove the camshaft sprocket and the camshaft timing chain.
    7. Fig 4: Removing Camshaft Sprocket & Camshaft Timing Chain
    GM869746Courtesy of GENERAL MOTORS CORP.
  7. UsingJ 5825-A  and an open end wrench, remove the crankshaft sprocket.
    8. Fig 5: Removing Crankshaft Sprocket Using J 5825-A
    GM869747Courtesy of GENERAL MOTORS CORP.
  8. Remove the crankshaft balancer key.
    9. Fig 6: Removing Crankshaft Balancer Key
    GM869734Courtesy of GENERAL MOTORS CORP.
  9. If necessary, remove the timing chain tensioner bracket bolt and bracket.
    10. Fig 7: Removing Timing Chain Tensioner Bracket
    GM1254412Courtesy of GENERAL MOTORS CORP.
  10. Clean and inspect the timing chain and sprockets, if necessary. Refer to Timing Chain and Sprockets Cleaning and Inspection .
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