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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 >> Installation Procedure

Installation Procedure

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    Fig 1: View Of Timing Chain Tensioner & Bolts
    GM637580Courtesy of GENERAL MOTORS CORP.
    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).

    2. Fig 2: View Of Timing Chain Guide & Bolts
    GM637585Courtesy 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 3: View Of Timing Chain Tensioner Shoe & Bolt
    GM637584Courtesy 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 4: View Of Cylinder Head Access Hole Plugs
    GM637770Courtesy 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 5: Installing Camshafts
    GM748322Courtesy of GENERAL MOTORS CORP.
  5. Install the J 44221  with the camshaft flats up and the number 1 piston at top dead center. See Special Tools and Equipment . The crank pin will be at 12 o'clock when the number 1 piston is at top dead center.
    6. Fig 6: Installing Timing Chain & Sprockets
    GM637578Courtesy 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. See Special Tools and Equipment .
  11. Install the intake camshaft sprocket onto the intake camshaft.
  12. Install the intake camshaft sprocket washer and bolt.
    13. Fig 7: Aligning Exhaust Camshaft Position Actuator
    GM637782Courtesy 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. See Special Tools and Equipment .
  15. Install the exhaust camshaft actuator onto the exhaust camshaft.
    16. Fig 8: Identifying Camshaft Position Actuator
    GM748329Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Rotate the camshaft actuator clockwise relative to the camshaft prior to tightening the bolt.
    NOTE: The camshaft actuator must be fully advanced during installation. Engine damage may occur if the camshaft actuator is not fully advanced.
  16. 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.

  17. 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.

    18. Fig 9: View Of Tee At Timing Chain Tensioner
    GM760718Courtesy of GENERAL MOTORS CORP.
  18. Remove the tee in the timing chain tensioner to regain tension on the timing chain.
  19. Remove the J 44221  . See Special Tools and Equipment .
    20. Fig 10: Locating Timing Marks
    GM748327Courtesy of GENERAL MOTORS CORP.
  20. The dark lines (1) on the chain should be aligned with the marks on the sprockets as shown.
    21. Fig 11: View Of top Chain Guide
    GM637766Courtesy of GENERAL MOTORS CORP.
  21. Install the top chain guide.
  22. Add threadlock GM P/N 12345496 on the top chain guide bolt threads.
  23. Install the top chain guide bolts.

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

  24. Install the engine front cover. Refer to Engine Front Cover Replacement  .
  25. Install the camshaft cover. Refer to Camshaft Cover Replacement  .
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