Envoy, Rainer, Trailblazer 2006-2007

Pinion Seal

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Removal & Installation



  1. Raise and safely support the front of the vehicle securely on jackstands.
  2.  
  3. Remove the engine protection shield.
  4.  
  5. Drain the drive axle.
  6.  
  7. Remove the rear steering gear crossmember as follows:
    1. Remove the 4 front steering gear crossmember rear mounting bolts.
    2.  
    3. Remove the 10 rear steering gear crossmember mounting bolts.
    4.  
    5. Remove 5 bolts securing the left converter heat shield to the floor panel studs and remove from the vehicle.
    6.  
    7. Remove the rear steering gear crossmember from the vehicle.
    8.  

  8.  
  9. Remove the front propeller shaft as follows:
    1. Reference mark the relationship of the propeller shaft to the front axle pinion yoke.
    2.  
    3. Remove the yoke retainer bolts and yoke retainers from the front axle pinion yoke.
      WARNING
      When removing the propeller shaft, do not attempt to remove the shaft by pounding on the yoke ears or using a tool between the yoke and the universal joint. If the propeller shaft is removed by using such means, the injection joints may fracture and lead to premature failure of the joint.

    4.  
    5. Disconnect the propeller shaft from the front axle pinon yoke.
    6.  
    7. Wrap the bearing caps with tape in order to prevent the loss of bearing rollers.
    8.  
    9. Remove the front propeller shaft from the transfer case.

      Click image to see an enlarged view

      Fig. Measuring the torque required to rotate the pinion-Envoy, Rainier and TrailBlazer

    10.  

  10.  
  11. Measure the torque required in order to rotate the pinion. Use an inch-pound torque wrench. Record the torque value for reassembly. This will give the combined preload for the following components:

    The pinion bearings
     
    The pinion seal
     
    The carrier bearings
     
    The axle bearings
     
    The axle seals

    Click image to see an enlarged view

    Fig. Scribe an alignment line between the pinion shaft and the pinion yoke-Envoy, Rainier and TrailBlazer

     

  12.  
  13. Scribe an alignment line between the pinion shaft and the pinion yoke.

    Click image to see an enlarged view

    Fig. Installation of special tool J-8614-01 onto the pinion-Envoy, Rainier and TrailBlazer

  14.  
  15. Install the J-8614-01 onto the pinion as shown.
  16.  
  17. Remove the pinion nut while holding the J-8614-01.

    Click image to see an enlarged view

    Fig. Installation of J-8614-2 (2) and J-8614-3 (3) into the J-8614-01 (1)-Envoy, Rainier and TrailBlazer

  18.  
  19. Install the J-8614-2 (2) and the J-8614-3 (3) into the J-8614-01 (1) as shown.
  20.  
  21. Remove the pinon yoke by turning the J-8614-3 (3) clockwise while holding the J-8614-01 (1).
  22.  
  23. Carefully remove the oil seal from the bore using a suitable seal removal tool. Do not distort or scratch the aluminum case.
  24.  
  25. Remove the dust deflector from the pinion yoke using a soft-faced hammer.
  26.  

To install:

  1. Install the new deflector onto the pinion yoke using a soft-faced hammer.
    WARNING
    Drive the seal in straight, not at an angle, as this will damage the aluminum housing.



    Click image to see an enlarged view

    Fig. Installation of the new oil seal using special tool J-33782-Envoy, Rainier and TrailBlazer

  2.  
  3. Install the new oil seal by doing the following:
    1. Position the oil seal in the bore.
    2.  
    3. Install the J-33782 over the oil seal.
    4.  
    5. Strike the J-33782 with a hammer until the seal flange seats on the axle housing surface.
    6.  

  4.  
  5. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the splines of the drive pinion yoke.
  6.  
  7. Install the pinion yoke. Align the reference marks made during removal.
    WARNING
    Do not hammer the pinion flange/yoke onto the pinion shaft. Pinion components may be damaged if the pinion flange/yoke is hammered onto the pinion shaft.

  8.  
  9. Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke.
  10.  
  11. Install the washer and a new pinion nut.
  12.  
  13. Install the J-8614-01 onto the pinion yoke as shown.
    WARNING
    If the rotating torque is exceeded, the pinion will have to be removed and a new collapsible spacer installed.

  14.  
  15. Tighten the pinion nut while holding the J-8614-01. Tighten the pinion nut until the pinion end play is just taken up. Rotate the pinion while tightening the nut to seat the bearings.
  16.  
  17. Measure the rotating torque of the pinion using an inch-pound torque wrench. Compare the measurement of the rotating torque to the measurement recorded earlier. The rotating torque of the pinion nut should be 3-5 inch lbs. (0.40-0.57 Nm) greater than the torque recorded during removal.
  18.  
  19. If the rotating torque is not within specifications, continue to tighten the pinion nut. Tighten the pinion nut, in small increments, as needed, until the torque required in order to rotate the pinion is 3-5 inch lbs. (0.40-0.57 Nm) greater than the torque recorded during removal.
  20.  
  21. Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the rotating torque and adjust if necessary.
  22.  
  23. Install the front propeller shaft as follows:
    1. Install the propeller shaft in the transfer case, aligning the reference marks made during removal.
      NOTE
      Ensure that the propeller shaft assembly is fully engaged into the slip yoke. The retaining ring will produce a snapping noise when the shaft is properly engaged.

    2.  
    3. Install the propeller shaft to the front axle pinion yoke.
    4.  
    5. Install the yoke retainers and the bolts and tighten them to 15 ft. lbs. (20 Nm).
    6.  

  24.  
  25. Install the rear steering gear crossmember as follows:
    1. Place the rear steering gear crossmember into position onto the vehicle.
    2.  
    3. Install the left catalytic converter heat shield and secure the heat shield with the 5 bolts and tighten them to 62 inch lbs. (7 Nm).
    4.  
    5. Install the 10 rear steering gear crossmember mounting bolts and the 4 front steering gear crossmember rear mounting bolts and tighten them to 37 ft. lbs. (50 Nm).
    6.  

  26.  
  27. Install the engine protection shield.
  28.  
  29. Fill the drive axle.
  30.  
  31. Lower the vehicle.
  32.  

 
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