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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1618 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Balance Shaft Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The balance shaft drive and balance shaft driven gears are serviced as a set. The set includes the balance shaft driven gear bolt.
  1. Apply clean engine oil to the balance shaft front bearing.
  2. Using J 36996  and J 8092  , install the balance shaft.
    Fig 1: Install Balance Shaft Using J 36996 & J 8092
    G02105959Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .
  3. Install the balance shaft retainer and bolts.

    Tighten 

    Tighten the bolts to 12 N.m (106 lb in).

    Fig 2: Balance Shaft Retainer & Bolts
    G02105960Courtesy of GENERAL MOTORS CORP.
  4. Install the balance shaft driven gear.
  5. If reusing the fastener, apply threadlock GM P/N 12345382, (Canadian P/N 10953489), or equivalent to the threads of the balance shaft driven gear bolt.
  6. Install the balance shaft driven gear bolt.
    1. 6.1. Use a wrench to secure the balance shaft.

      Place the wrench onto the balance shaft near to the balance shaft front bearing.

    2. 6.2. Install the balance shaft driven gear bolt.

      Tighten 

      1. 6.2.1. Tighten the bolt a first pass to 20 N.m (15 lb ft).
      2. 6.2.2. Tighten the bolt a final pass using the J 36660-A  an additional 35 degrees.
    Fig 3: Balance Shaft Driven Gear & Bolt
    G02105961Courtesy of GENERAL MOTORS CORP.
  7. Remove the wrench from the balance shaft.
  8. Rotate the balance shaft by hand in order to ensure that there is clearance between the balance shaft and the valve lifter pushrod guide. If the balance shaft does not rotate freely, check to ensure that the retaining ring on the balance shaft front bearing is seated on the case.
  9. Install the balance shaft drive gear. DO NOT install the camshaft sprocket bolts at this time.
    Fig 4: Balance Shaft Drive Gear
    G02105962Courtesy of GENERAL MOTORS CORP.
  10. Rotate the camshaft so that the timing mark on the balance shaft drive gear is in the 12 o'clock position.
    Fig 5: Timing Mark On Drive Gear
    G02105963Courtesy of GENERAL MOTORS CORP.
  11. Remove the balance shaft drive gear.
    Fig 6: Balance Shaft Drive Gear
    G02105964Courtesy of GENERAL MOTORS CORP.
  12. Rotate the balance shaft so that the timing mark on the balance shaft driven gear is in the 6 o'clock position.
    Fig 7: Timing Mark On Balance Shaft Driven Gear
    G02105965Courtesy of GENERAL MOTORS CORP.
  13. Position the balance shaft drive gear onto the engine camshaft.
  14. Look to ensure that the balance shaft drive gear and the balance shaft driven gear timing marks are aligned.
  15. Install the timing chain and the camshaft sprocket. Refer to Timing Chain and Sprockets Replacement .
  16. Install the valve lifter pushrod guide. Refer to Valve Lifter Replacement .
  17. Install the A/C condenser. Refer to CONDENSER REPLACEMENT .
  18. Install the radiator. Refer to RADIATOR REPLACEMENT .
    Fig 8: Aligning Balance Shaft Drive Gear & Balance Shaft Driven Gear
    G02105966Courtesy of GENERAL MOTORS CORP.
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