Mitsubishi Pick-ups and Montero 1983-1995 Repair Guide

Pinion Seal

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REMOVAL & INSTALLATION



See Figure 1

  1. Raise the vehicle and support it safely on jackstands.
  2.  
  3. Matchmark and remove the driveshaft.
  4.  
  5. Check the turning torque of the pinion before proceeding. It should be 3.5-4.5 inch lbs. (0.4-0.5 Nm). This is the torque that must be reached during installation of the pinion nut.
  6.  
  7. Using a suitable pinion flange holding tool, remove the pinion nut and washer.
  8.  
  9. Remove the companion flange from the drive pinion.
  10.  
  11. Pry the pinion seal out of the differential carrier.
  12.  

To install:
  1. Clean and inspect the sealing surface of the housing.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Rear differential pinion oil seal removal and installation-all Pick-ups and Monteros

  1. Using a seal driver, drive the new seal into the housing until the flange on the seal is flush with the carrier.
  2.  
  3. With the seal installed, the pinion bearing preload must be set.
  4.  
  5. Tighten the pinion nut (a new self-locking pinion nut must be used) while holding the flange, until the turning torque is the same as before removal. The final pinion nut torque must be between 137-181 ft. lbs. (190-250 Nm).
  6.  
  7. Align the matchmarks and install the driveshaft.
  8.  
  9. Check the level of the differential lubricant when finished.
  10.  

 
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