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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Engine Mechanical - 3.7L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Balance Shaft Installation

Balance Shaft Installation

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Balance Shafts
    GM1367352Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not disassemble the balance shaft assemblies. Remove and install the balance shafts as complete assemblies.
  1. Lubricate the balance shaft bearing journals with clean engine oil.
  2. Install NEW balance shaft assemblies with the counterweight down to prevent damage to the balance shaft bearings.
    3. NOTE: Refer to Fastener Notice in Cautions and Notices.
  3. Install NEW left balance shaft assembly retaining bolts.

    Tighten:  Tighten the NEW left balance shaft assembly retaining bolts to 10 N.m (89 lb in).

    4. Fig 2: View Of Balance Shaft Chain Guide
    GM954003Courtesy of GENERAL MOTORS CORP.
  4. Install the balance shaft chain guide.
  5. Install the balance shaft chain guide bolts.

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

    6. Fig 3: View Of Balance Shaft Drive Chain
    GM953998Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Rotate the right balance shaft retainer plate counter-clockwise to allow chain installation over all 3 sprockets.
  6. Install the balance shaft chain onto the balancer sprockets and crankshaft sprocket.
    7. Fig 4: Sprocket Timing Marks
    GM953991Courtesy of GENERAL MOTORS CORP.
  7. Rotate the crankshaft until the left hand balance shaft sprocket timing mark is at 12:00. The right hand balance shaft sprocket timing mark should be at 2:30. The crankshaft sprocket mark should be at 4:30. Make sure the 3 timing marks on the sprockets (1) line up with a dark link on the chain. Every 11 crankshaft rotations, 3 of the 5 dark links on the chain will line up with the timing marks.
  8. Rotate the retainer plate clockwise while holding the chain onto the crankshaft sprocket.
    9. Fig 5: View Of Balance Shaft Chain Tensioner
    GM953994Courtesy of GENERAL MOTORS CORP.
  9. Install NEW right balance shaft assembly retaining bolts.

    Tighten:  Tighten the NEW right balance shaft assembly retaining bolts to 12 N.m (106 lb in).

  10. Install the balance shaft chain tensioner and bolts.

    Tighten:  Tighten the balance shaft chain tensioner bolts to 10 N.m (89 lb in).

    11. IMPORTANT: Do not force the tensioner to the next notch by pushing up on the tensioner shoe. This will over-tension the chain and may result in a whine noise.
  11. Remove the small tool from the link plate hole in order to regain chain tension.
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