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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1244 (Engine Mechanical - 3.8L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Timing Chain and Sprockets Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the balance shaft driven gear, if required.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  2. Prevent the balance shaft from rotating and install the balance shaft driven gear bolt.

    Tighten 

    1. 2.1. Tighten the balance shaft driven gear bolt to 22 N.m (16 lb ft).
    2. 2.2. Use the J 36660-A  to rotate the bolt an additional 70 degrees.
    Fig 1: Installing Balance Shaft Driven Gear
    G02083640Courtesy of GENERAL MOTORS CORP.
  3. Install the camshaft thrust plate, if required.
  4. Install the camshaft thrust plate bolts, if required.

    Tighten 

    Tighten the bolts to 15 N.m (11 lb ft).

    Fig 2: Installing Camshaft Thrust Plate
    G02083641Courtesy of GENERAL MOTORS CORP.
  5. Install the balance shaft drive gear.
    Fig 3: Installing Balance Shaft Drive Gear
    G02083642Courtesy of GENERAL MOTORS CORP.
  6. Align the timing marks on the balance shaft drive gear and the balance shaft driven gear.
    Fig 4: Aligning Timing Marks
    G02083643Courtesy of GENERAL MOTORS CORP.
  7. Install the crankshaft sprocket.
  8. Install the timing chain and the camshaft sprocket.
    Fig 5: Installing Timing Chain And Camshaft Sprocket
    G02083644Courtesy of GENERAL MOTORS CORP.
  9. Assemble the timing chain on the sprockets with the timing marks as close together as possible.
    Fig 6: Assembling Timing Chain On Sprockets With Timing Marks
    G02083645Courtesy of GENERAL MOTORS CORP.
  10. Install the camshaft sprocket bolt.

    Tighten 

    1. 10.1. Tighten the camshaft sprocket bolt to 100 N.m (74 lb ft).
    2. 10.2. Use the J 36660-A  to rotate the bolt an additional 90 degrees.
    Fig 7: Installing Camshaft Sprocket Bolt
    G02083646Courtesy of GENERAL MOTORS CORP.
  11. Install the timing chain dampener.
  12. Install the timing chain dampener bolt.

    Tighten 

    Tighten the bolt to 22 N.m (16 lb ft).

    Important:  Rotate the engine two revolutions and check the timing marks. Ensure that the marks are aligned.

  13. Install the engine front cover. Refer to ENGINE FRONT COVER REPLACEMENT  .
    Fig 8: Installing Timing Chain Dampener
    G02083647Courtesy of GENERAL MOTORS CORP.
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