Crossfire 2006-2008

Balance Shaft

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A balance shaft is used to compensate for the rocking motion inherent in a 90-degree V-6 engine. It rotates at engine speed in the opposite direction. Mounted above the crankshaft in the cylinder block, it is driven by the timing chain.

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect battery negative cable from battery and properly isolate to prevent accidental reconnection.
  4.  
  5. Remove the timing chain cover.
  6.  
  7. Rotate the crankshaft and align the basic valve timing to 40 degrees ATDC.
  8.  
  9. Remove the starter.
  10.  
  11. Using Special Tool 9102 or a suitable flywheel locking tool, lock the flywheel.
  12.  
  13. Remove or disconnect the following:

    Timing chain
     
    Rear crankshaft oil seal
     

  14.  
  15. Hold the balance shaft rear counter weight with a drift and remove the rear retaining bolt.
  16.  
  17. Remove the balance shaft rear counter weight from the balance shaft.
  18.  
  19. Remove the balance shaft locking plate bolt (6) and locking plate at the front of the engine block.
  20.  
  21. Remove the balance shaft (5) from the front of the engine.

    Click image to see an enlarged view

    Fig. Setting basic valve timing to 40 degrees ATDC



    Click image to see an enlarged view

    Fig. Balance shaft (5), retaining bolt (4), counterweight (3), locking plate bolt (6) and timing chain overview

  22.  

To install:

  1. Position the balance shaft (5) into the engine balance shaft bore from the front.
  2.  
  3. Install the balance shaft rear counter weight onto the balance shaft and tighten the rear bolt to 15 ft. lbs. (20 Nm). Further rotate the bolt an additional 90°
  4.  
  5. Install the balance shaft locking plate and tighten the bolt to 15 ft. lbs. (20 Nm).
  6.  
  7. Install the crankshaft rear oil seal.
  8.  
  9. Install the timing chain and cover.
  10.  
  11. Remove Special Tool 9102 (flywheel locking tool) and install the starter.
  12.  
  13. Start the engine and check for leaks.
  14.  

 
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