Canyon, Colorado 2006-2007

Pinion Seal

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    The following procedure requires the use of the Pinion Holding tool J-8614-01 and the Pinion Seal Installation tool J-33782.

  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the front wheels.
  6.  
  7. Remove or disconnect the following:

    Engine undercover
     
    Driveshaft from the pinion flange. Matchmark the driveshaft prior to removal.
     
    Brake calipers and wire out of the way.
     

  8.  
  9. Mark the position of the pinion stem, flange and nut for reference.
  10.  
  11. Use an inch lbs. torque wrench to measure the amount of torque necessary to turn the pinion, then note this measurement as it is the combined pinion bearing, seal, carrier bearing, axle bearing and seal preload.
  12.  
  13. Remove or disconnect the following:

    Pinion flange nut and washer, using a Pinion Holding tool J-8614-01 and a Pinion Flange Removal tool J-8614-1, J-8614-2, J-8614-3, as applicable
     
    Pinion flange
     
    Pinion oil seal by driving it out of the differential with a blunt chisel; DO NOT damage the carrier
     

  14.  

To install:

  1. Examine the seal surface of pinion flange for tool marks, nicks or damage, such as a groove worn by the seal. If damaged, replace flange.
  2.  
  3. Examine the carrier bore and remove any burrs that might cause leaks around the O.D. of the seal.
  4.  
  5. Install a new pinion oil seal using a seal installer tool
  6.  
  7. Apply GM seal lubricant 12346004 to the splines of the pinion yoke.
  8.  
  9. Install or connect the following:

    Pinion flange aligning the reference marks made earlier.
     

  10.  
  11. Seat the flange on the shaft by tapping in with a soft-faced hammer.
  12.  
  13. Install the washer and new nut.
  14.  
  15. Install Pinion Holding tool J-8614-01 and tighten the nut while holding the tool until the end play is removed.
  16.  
  17. Continue tightening the nut until the preload torque is 3-5 inch lbs. (0.40-0.57 Nm) greater than the previously measured torque.
  18.  
  19. Rotate the pinion several times to ensure the bearing is seated.
  20.  
  21. Install the brake calipers.
  22.  
  23. Install the driveshaft to the pinion flange using the matchmarks made earlier.
  24.  
  25. Install the engine undercover.
    NOTE
    If fluid was lost from the differential housing during this procedure, be sure to check and add additional fluid, as necessary.



    Click image to see an enlarged view

    Fig. Removing the pinion nut using a pinion holding fixture tool

  26.  

 
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