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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1224 (Engine Mechanical - 3.8L (On-Vehicle)) >> Repair Instructions >> Timing Chain and Sprockets Replacement (L36) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2002 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 .
    NOTE: This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.
  2. Prevent the balance shaft from rotating and install the balance shaft driven gear bolt.

    Tighten 

    Tighten the balance shaft driven gear bolt to 22 N.m (16 lb ft). Use the J 36660-A  in order to rotate the bolts an additional 70 degrees.

    Fig 1: Balance Shaft Driven Gear
    G01703300Courtesy of GENERAL MOTORS CORP.
  3. Install the camshaft thrust plate, if required.
  4. Install the camshaft thrust plate bolts, if required.

    Tighten 

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

    Fig 2: Camshaft Thrust Plate
    G01703301Courtesy of GENERAL MOTORS CORP.
  5. Install the balance shaft drive gear, if required.
    Fig 3: Balance Shaft Drive Gear
    G01703302Courtesy of GENERAL MOTORS CORP.
  6. Align the timing marks on the balance shaft drive gear and the balance shaft driven gear.
    Fig 4: Aligning Balance Shaft Gears
    G01703303Courtesy of GENERAL MOTORS CORP.
  7. Install the crankshaft sprocket.
  8. Install the timing chain and sprocket.
    Fig 5: Timing Chain & Crankshaft Sprocket
    G01703304Courtesy of GENERAL MOTORS CORP.
  9. Assemble the timing chain on the sprockets with the timing marks as close together as possible.
    Fig 6: Aligning Sprockets
    G01703305Courtesy of GENERAL MOTORS CORP.
  10. Install the camshaft sprocket bolt.

    Tighten 

    Tighten the camshaft sprocket bolt to 100 N.m (74 lb ft). Use the J 36660-A  in order to rotate the bolts an additional 90 degrees.

    Fig 7: Camshaft Sprocket Bolt
    G01703306Courtesy of GENERAL MOTORS CORP.
  11. Install the timing chain dampener.

    Tighten 

    Tighten the dampener 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.
  12. Install the engine front cover. Refer to Engine Front Cover Replacement .
    Fig 8: Timing Chain Dampener
    G01703307Courtesy of GENERAL MOTORS CORP.
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