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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 >> Installation Procedure

Installation 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.
IMPORTANT: Every seventh link of the timing chain is darkened to aid in aligning the timing marks.
  1. Install the timing chain tensioner and secure the tensioner with the bolts.
    NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    Tighten 

    Tighten the timing chain tensioner bolts to 25 N.m (18 lb ft).

    2. Fig 1: Installing Timing Chain Tensioner And Bolts
    G01706318Courtesy of GENERAL MOTORS CORP.
  2. Install the timing chain tensioner guide and secure the guide with the bolts.

    Tighten 

    Tighten the timing chain tensioner guide to 10 N.m (89 lb in).

    3. Fig 2: Installing Timing Chain Tensioner Guide And Bolts
    G01706319Courtesy of GENERAL MOTORS CORP.
  3. Install the timing chain tensioner shoe and secure the shoe with the bolt.

    Tighten 

    Tighten the timing chain tensioner shoe bolt to 26 N.m (19 lb ft).

    4. Fig 3: Installing Timing Chain Tensioner Shoe And Bolt
    G01706320Courtesy of GENERAL MOTORS CORP.
  4. Install the cylinder head access hole plugs.

    Tighten 

    Tighten the cylinder head access hole plugs to 5 N.m (44 lb in).

    5. Fig 4: Installing Cylinder Head Access Hole Plugs
    G01706321Courtesy of GENERAL MOTORS CORP.
  5. Install the J 44221 with the camshaft flats up and the number 1 cylinder at top dead center.
    6. Fig 5: Installing J 44221 With Camshaft Flats Up And Number 1 Cylinder At Top Dead Center
    G01706322Courtesy of GENERAL MOTORS CORP.
  6. Install the crankshaft sprocket (1).
    7. Fig 6: Installing Crankshaft Sprocket
    G01706323Courtesy of GENERAL MOTORS CORP.
  7. Install the intake camshaft sprocket into the timing chain.
  8. Align the dark link of the timing chain with the timing mark on the intake camshaft sprocket (1).
  9. Feed the timing chain down through the opening in the head.
  10. Install the timing chain onto the crankshaft sprocket. Align the dark link of the timing chain with the timing mark on the crankshaft sprocket.
    IMPORTANT: It may be necessary to remove J 44221 to rotate and hold the camshaft (hex) to align the pin to the camshaft sprocket.
  11. Install the intake camshaft sprocket onto the intake camshaft.
    NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  12. Install the intake camshaft sprocket washer and bolt.
  13. Install the exhaust camshaft actuator into the timing chain.
  14. Align the dark link of the timing chain with the timing mark on the exhaust camshaft actuator (1).
    IMPORTANT: It may be necessary to remove the J 44221 to rotate and hold the camshaft hex to align the pin to the camshaft sprocket.
    15. Fig 7: Aligning Dark Link Of Timing Chain With Timing Mark On Exhaust Camshaft Actuator
    G01706324Courtesy of GENERAL MOTORS CORP.
  15. Install the exhaust camshaft actuator onto the exhaust camshaft.
    IMPORTANT: Rotate the camshaft actuator clockwise relative to the camshaft prior to tightening the bolt.
  16. Rotate the camshaft actuator clockwise (as seen from the front of the vehicle).
    NOTE: The camshaft actuator must be fully advanced during installation. Engine damage may occur if the camshaft actuator is not fully advanced.
    17. Fig 8: Rotating Camshaft Actuator Clockwise
    G01706325Courtesy of GENERAL MOTORS CORP.
  17. Install the exhaust camshaft actuator bolt.

    Tighten 

    • Tighten the exhaust camshaft actuator bolt the first pass to 25 N.m (18 lb ft).
    • Use J 36660-A to tighten the exhaust camshaft actuator bolt the final pass an additional 135 degrees.
  18. Tighten 
    • Tighten the intake camshaft sprocket bolt the first pass to 30 N.m (22 lb ft).
    • Use J 36660-A to tighten the intake camshaft sprocket bolt the final pass an additional 135 degrees.
  19. Remove the tee in the timing chain tensioner to regain tension on the timing chain.
    20. Fig 9: Removing Tee In Timing Chain Tensioner
    G01706326Courtesy of GENERAL MOTORS CORP.
  20. Remove the J 44221.
  21. The dark lines (1) on the chain should be aligned with the marks on the sprockets as shown.
    22. Fig 10: Aligning Dark Lines On Chain With Marks On Sprockets
    G01706327Courtesy of GENERAL MOTORS CORP.
  22. Install the top chain guide.
  23. Add threadlock GM P/N 12345493 to the top chain guide bolt threads.
  24. Install the top chain guide bolts.

    Tighten 

    Tighten the top chain guide bolts to 10 N.m (89 lb in).

    25. Fig 11: Installing Top Chain Guide Bolts
    G01706328Courtesy of GENERAL MOTORS CORP.
  25. Install the engine front cover. Refer to Engine Front Cover Replacement .
  26. Install the camshaft cover. Refer to Camshaft Cover Replacement .
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