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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 418 (Engine Mechanical - 4.2L 6-Cylinder (On-Vehicle)) >> Repair Instructions >> Timing Chain, Sprockets, and/or Tensioner Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 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. Release the tension on the timing chain by moving the tensioner shoe in.
    4. Fig 1: Releasing Tension On Timing Chain
    G01706309Courtesy of GENERAL MOTORS CORP.
  4. Place the tee into the tensioner to hold the shoe in place.
    5. Fig 2: Placing Tee Into Tensioner
    G01706310Courtesy of GENERAL MOTORS CORP.
  5. Remove the top chain guide bolts.
    6. Fig 3: Removing Top Chain Guide Bolts
    G01706311Courtesy of GENERAL MOTORS CORP.
  6. Remove the top chain guide.
  7. Remove the exhaust camshaft position actuator bolt.
    8. Fig 4: Removing Exhaust Camshaft Position Actuator Bolt
    G01706312Courtesy of GENERAL MOTORS CORP.
  8. Remove the exhaust camshaft position actuator.
  9. Remove the intake camshaft sprocket bolt.
    10. Fig 5: Removing Intake Camshaft Sprocket Bolt
    G01706313Courtesy of GENERAL MOTORS CORP.
  10. Remove the intake camshaft sprocket.
  11. Remove the timing chain.
  12. Remove the crankshaft sprocket.
  13. Remove the cylinder head access hole plugs.
    14. Fig 6: Removing Cylinder Head Access Hole Plugs
    G01706314Courtesy of GENERAL MOTORS CORP.
  14. Remove the timing chain tensioner shoe bolt.
    15. Fig 7: Removing Timing Chain Tensioner Shoe Bolt
    G01706315Courtesy of GENERAL MOTORS CORP.
  15. Remove the timing chain tensioner shoe.
  16. Remove the timing chain tensioner guide bolts.
    17. Fig 8: Removing Timing Chain Tensioner Guide Bolts
    G01706316Courtesy of GENERAL MOTORS CORP.
  17. Remove the timing chain tensioner guide.
  18. Remove the timing chain tensioner bolts.
    19. Fig 9: Removing Timing Chain Tensioner Bolts
    G01706317Courtesy of GENERAL MOTORS CORP.
  19. Remove the timing chain tensioner.
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