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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1018 (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 2004 GMC Sierra and 2004 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  andJ 8092  , install the balance shaft.
    3. Fig 1: Installing Balance Shaft
    GM869750Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  3. Install the balance shaft retainer and bolts.

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

    4. Fig 2: View of Balance Shaft Retainer & Bolts
    GM188031Courtesy of GENERAL MOTORS CORP.
  4. Install the balance shaft driven gear.
  5. If reusing the fastener, apply Threadlocker 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. Use a wrench to secure the balance shaft.

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

    2. Install the balance shaft driven gear bolt.

      Tighten: 

      1. Tighten the bolt a first pass to 20 N.m (15 lb ft).
      2. Tighten the bolt a final pass an additional 35 degrees using J 45059  .

    7. Fig 3: Locating Balance Shaft Driven Gear
    GM5136Courtesy 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.
    10. Fig 4: View Of Balance Shaft Drive Gear
    GM9847Courtesy 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.
    11. Fig 5: Balance Shaft Drive Gear Camshaft Timing Mark
    GM9848Courtesy of GENERAL MOTORS CORP.
  11. Remove the balance shaft drive gear.
    12. Fig 6: View Of Balance Shaft Drive Gear
    GM9847Courtesy 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.
    13. Fig 7: Balance Shaft Driven Gear Timing Mark
    GM9849Courtesy 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. Fig 8: Aligning Balance Shaft Drive Gear & Balance Shaft Driven Gear Timing Marks
    GM5144Courtesy of GENERAL MOTORS CORP.
  15. Install the timing chain and the camshaft sprocket. Refer to Timing Chain, Sprockets, and/or Tensioner Replacement .
  16. Install the valve lifter pushrod guide. Refer to Valve Lifter Replacement .
  17. Install the A/C condenser. Refer to Condenser Replacement in Heating, Ventilation, and Air Conditioning.
  18. Install the radiator. Refer to Radiator Replacement (EXC 8.1L) or Radiator Replacement (8.1L) in Engine Cooling.
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