GM Astro/Safari 1985-1996 Repair Guide

Pinion Oil Seal

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REMOVAL & INSTALLATION



See Figures 1, 2 and 3



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Fig. Fig. 1: Before removing the flange nut, measure pre-load (rotational force) using an inch lbs. torque wrench



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Fig. Fig. 2: A flange holding tool will be necessary to loosen or tighten the pinion nut



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Fig. Fig. 3: Use a suitable driver or seal installer to seat the replacement seal

  1. Disconnect the negative battery cable for safety.
  2.  
  3. Raise and support the vehicle safely using jackstands.
  4.  
  5. Matchmark and remove the front driveshaft from the vehicle.
  6.  
  7. Mark the nut, washer and flange so during installation the same amount of torque can be provided for the correct amount of bearing pre-load.
  8.  
  9. Using an inch lbs. torque wrench (beam type with a needle gauge is usually easiest for this), measure the current pinion pre-load (the amount of force necessary to rotate the pinion).
  10.  
  11. Remove the pinion flange nut and washer using a companion flange holder J-8614-01 or equivalent to keep the assembly from spinning.
  12.  
  13. Place a container under the flange to catch any fluid which may leak, then remove the flange.
  14.  
  15. Remove the oil seal by driving it out of the carrier with a blunt chisel.
  16.  


WARNING
Be careful when removing the seal not to damage the sealing surface of the bore.

To install:
  1. Clean all seal surfaces and remove burrs.
  2.  
  3. Install the new seal using a suitable driver or an oil seal installer such as J-33782.
  4.  
  5. Lubricate the seal lip and outside of the pinion flange with differential fluid or, if available, GM seal lubricant no. 1050169.
  6.  
  7. Install the pinion flange, washer and nut, aligning all of the marks made earlier. The pinion flange must be installed with the SAME spline relationship marked during removal.
  8.  
  9. Tighten the nut to previously marked position, then check the pre-load.
  10.  
  11. If necessary, tighten the nut additionally to match the pre-load recorded earlier. Remember that the flange holding tool should be removed each time before re-checking the pre-load.
  12.  
  13. For 1990-95 vehicles, tighten the nut until an additional 3-5 inch lbs. (0.3-0.6 Nm) of pre-load is achieved. If no torque wrench is available, tighten the nut approximately 1 / 16 in. (1.5mm) past the alignment mark.
  14.  
  15. Align and install the front driveshaft.
  16.  
  17. Check and add fluid to the front differential, as necessary. Remember that the vehicle must be level or you will not obtain the proper reading.
  18.  
  19. Remove the jackstands and carefully lower the vehicle.
  20.  
  21. Connect the negative battery cable.
  22.  

 
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