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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1443 (Engine Mechanical - 4.2L (Ll8)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Timing Chain, Sprockets, And/Or TENSIONER Replacement >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the camshaft cover. Refer to Camshaft Cover Replacement  .
  2. Remove the engine front cover. Refer to Engine Front Cover Replacement  .
    3. Fig 1: Releasing Tension On Timing Chain
    GM760721Courtesy of GENERAL MOTORS CORP.
  3. Release the tension on the timing chain by moving the tensioner shoe in.
    4. Fig 2: View Of Tee At Timing Chain Tensioner
    GM760718Courtesy of GENERAL MOTORS CORP.
  4. Place the tee into the tensioner to hold the shoe in place.
    5. Fig 3: View Of top Chain Guide
    GM637766Courtesy of GENERAL MOTORS CORP.
  5. Remove the top chain guide bolts.
  6. Remove the top chain guide.
    7. Fig 4: View Of Exhaust Camshaft Position Actuator
    GM637783Courtesy of GENERAL MOTORS CORP.
  7. Remove the exhaust camshaft position actuator bolt.
  8. Remove the exhaust camshaft position actuator.
    9. Fig 5: View Of Timing Chain & Sprockets
    GM637575Courtesy of GENERAL MOTORS CORP.
  9. Remove the intake camshaft sprocket bolt.
  10. Remove the intake camshaft sprocket.
  11. Remove the timing chain.
  12. Remove the crankshaft sprocket.
    13. Fig 6: View Of Cylinder Head Access Hole Plugs
    GM637770Courtesy of GENERAL MOTORS CORP.
  13. Remove the cylinder head access hole plugs.
    14. Fig 7: View Of Timing Chain Tensioner Shoe & Bolt
    GM637584Courtesy of GENERAL MOTORS CORP.
  14. Remove the timing chain tensioner shoe bolt.
  15. Remove the timing chain tensioner shoe.
    16. Fig 8: View Of Timing Chain Guide & Bolts
    GM637585Courtesy of GENERAL MOTORS CORP.
  16. Remove the timing chain tensioner guide bolts.
  17. Remove the timing chain tensioner guide.
    18. Fig 9: View Of Timing Chain Tensioner & Bolts
    GM637580Courtesy of GENERAL MOTORS CORP.
  18. Remove the timing chain tensioner bolts.
  19. Remove the timing chain tensioner.
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