LaCrosse 2006-2007

Balance Shaft

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Removal & Installation



3.8L Engine


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Fig. Remove the balance shaft driven gear bolt-3.8L Engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the balance shaft driven gear bolt.
  4.  
  5. Remove the balance shaft driven gear.

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    Fig. Remove the balance shaft retainer bolts-3.8L Engine

  6.  
  7. Remove the balance shaft retainer bolts.
  8.  
  9. Remove the balance shaft retainer.

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    Fig. Use J 6125-1B to remove the balance shaft-3.8L Engine

  10.  
  11. Use the slide hammer, J 6125-1B, to remove the balance shaft.
  12.  

To install:

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Fig. Use J 21465-13 and J 36996 to install the balance shaft into the engine block-3.8L Engine

  1. Use J 21465-13 and J 36996 to install the balance shaft into the engine block.
  2.  
  3. Install the balance shaft retainer.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4.  
  5. Install the balance shaft retainer bolts. Tighten the bolts to 22 ft. lbs. (30 Nm).
  6.  
  7. Install the balance shaft driven gear.
  8.  
  9. Install the balance shaft driven gear bolt. Tighten the bolt:
    1. Step 1: 16 ft. lbs. (22 Nm).
    2.  
    3. Use J 45059 to tighten the bolt an additional 70°.
    4.  

  10.  
  11. Using J 8001, measure the balance shaft end play. End play must not exceed 0.008 in. (0.028mm).
  12.  
  13. Using J 8001, measure the balance shaft radial play at the rear. Radial play must be between 0.0005-0.0047 in. (0.0127-0.119mm).
  14.  
  15. Install the balance shaft drive gear.
  16.  
  17. Install the camshaft sprocket.
  18.  
  19. Turn the camshaft so the timing mark on the camshaft sprocket is straight down.
  20.  
  21. Remove the camshaft sprocket and balance shaft drive gear.
  22.  
  23. Turn the balance shaft so the timing mark on the balance shaft driven gear points straight down.
  24.  
  25. Partially install the balance shaft drive gear so the gear teeth are not engaged.
  26.  
  27. Align the marks on the balance shaft driven gear and the balance shaft drive gear. Do this by turning the balance shaft.
  28.  
  29. Once the marks are aligned, fully seat the balance shaft drive gear and engage the gear teeth.
  30.  
  31. Turn the crankshaft so the number one piston is at Top Dead Center (TDC).
  32.  
  33. Install the timing chain and camshaft sprocket.
  34.  
  35. Using J 8001, measure the gear lash at four places. Measure every quarter turn. Gear lash must be between 0.002-0.005 in. (0.050-0.127mm).
  36.  

 
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