Jeep CJ/Scrambler 1971-1986 Repair Guide

Pinion Oil Seal

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REMOVAL & INSTALLATION



See Figures 1 and 2

Semi-Floating Axle w/Tapered Shaft

Special tools are needed for this job.

  1. Raise and support the vehicle and remove the rear wheels and brake drums.
  2.  
  3. Mark the driveshaft and yoke for reassembly and disconnect the driveshaft from the rear yoke.
  4.  
  5. With a socket on the pinion nut and an inch lb. torque wrench, rotate the drive pinion several revolutions. Check and record the torque required to turn the drive pinion.
  6.  
  7. Remove the pinion nut. Use a flange holding tool to hold the flange while removing the pinion nut. Discard the pinion nut.
  8.  
  9. Mark the yoke and the drive pinion shaft for reassembly reference.
  10.  
  11. Remove the rear yoke with a puller.
  12.  
  13. Inspect the seal surface of the yoke and replace it with a new one if the seal surface is pitted, grooved, or otherwise damaged.
  14.  
  15. Remove the pinion oil seal using tool J-9233.
  16.  
  17. Before installing the new seal, coat the lip of the seal with rear axle lubricant.
  18.  
  19. Install the seal, driving it into place with tool J-22661.
  20.  
  21. Install the yoke on the pinion shaft. Align the marks made on the pinion shaft and yoke during disassembly.
  22.  
  23. Install a new pinion nut. Tighten nut until endplay is removed from the pinion bearing. Do not overtighten.
  24.  
  25. Check the torque required to turn the drive pinion. The pinion must be turned several revolutions to obtain an accurate reading.
  26.  
  27. Tighten the pinion nut to obtain the torque reading observed during disassembly (Step 3) plus 5 inch. lbs. Tighten the nut minutely each time, to avoid overtightening. Do not loosen and then retighten the nut.
  28.  

If the desired torque is exceeded a new collapsible pinion spacer sleeve must be installed and the pinion gear preload reset.

  1. Install the driveshaft, aligning the index marks made during disassembly. Install the rear brake drums and wheels.
  2.  



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Fig. Fig. 1: Pinion nut removal on all axles will require a holding tool to keep the pinion yoke stationary



Click image to see an enlarged view

Fig. Fig. 2: Removing the pinion yoke from the differential housing

Semi-Floating Axles w/Flanged Shaft
  1. Raise and support the vehicle.
  2.  
  3. Mark the driveshaft and yoke for reference during assembly and disconnect the driveshaft at the yoke.
  4.  
  5. Remove the pinion shaft nut and washer.
  6.  
  7. Remove the yoke from the pinion shaft, using a puller.
  8.  
  9. Remove the pinion shaft oil seal with tool J-25180.
  10.  
  11. Install the new seal with a suitable driver.
  12.  
  13. Install the pinion shaft washer and nut. Tighten the nut to 210 ft. lbs.
  14.  
  15. Align the index marks on the driveshaft and yoke and install the driveshaft. Tighten the attaching bolts or nuts to 16 ft. lbs.
  16.  
  17. Remove the supports and lower the vehicle.
  18.  

 
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