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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1497 (Engine Mechanical - 4.2L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Timing Chain, Sprockets, and/or Tensioner Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
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.

    Tighten 

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

    Fig 1: Installing Timing Chain Tensioner
    G02128563Courtesy 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).

    Fig 2: Installing Timing Chain Tensioner Guide
    G02128564Courtesy 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).

    Fig 3: Installing Timing Chain Tensioner Shoe
    G02128565Courtesy 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).

    Fig 4: Installing Cylinder Head Access Hole Plugs
    G02128566Courtesy of GENERAL MOTORS CORP.
  5. Install the J 44221  with the camshaft flats up and the number 1 cylinder at top dead center. Crank pin will be at 12 o'clock position when number 1 piston is at top dead center.
    Fig 5: Installing Camshaft Holding Tool
    G02128567Courtesy of GENERAL MOTORS CORP.
  6. Install the crankshaft sprocket (1).
  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 on the crankshaft sprocket. Align the dark link of the timing chain with the timing mark on to 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.
  12. Install the intake camshaft sprocket washer and bolt.
    Fig 6: Installing Crankshaft Sprocket And Timing Chain
    G02128568Courtesy of GENERAL MOTORS CORP.
  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. Install the exhaust camshaft actuator onto the exhaust camshaft.
    Fig 7: Aligning Dark Link Of Timing Chain With Timing Mark On Exhaust Camshaft Actuator
    G02128569Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Rotate the camshaft actuator clockwise relative to the camshaft prior to tightening the bolt.
  16. Rotate the camshaft actuator clockwise until it stops (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.
    Fig 8: Rotating Camshaft Actuator Clockwise Until It Stops
    G02128570Courtesy 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. Install the intake camshaft sprocket bolt.

    Tighten 

    • Tighten the intake camshaft sprocket bolt the first pass to 20 N.m (15 ft lb).
    • Use J 36660-A  to tighten the intake camshaft sprocket bolt the final pass an additional 100 degrees.
  19. Remove the tee in the timing chain tensioner to regain tension on the timing chain.
  20. Remove the J 44221  .
    Fig 9: Removing Tee In Timing Chain Tensioner
    G02128571Courtesy of GENERAL MOTORS CORP.
  21. The dark lines (1) on the chain should be aligned with the marks on the sprockets as shown.
    Fig 10: Aligning Dark Lines On Chain With Marks On Sprockets
    G02128572Courtesy of GENERAL MOTORS CORP.
  22. Install the top chain guide.
  23. Add threadlock GM P/N 12345496 on 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 ft).

  25. Install the engine front cover. Refer to ENGINE FRONT COVER REPLACEMENT   .
  26. Install the camshaft cover. Refer to CAMSHAFT COVER REPLACEMENT   .
    Fig 11: Installing Top Chain Guide
    G02128573Courtesy of GENERAL MOTORS CORP.
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