AMC Coupes/Sedans/Wagons 1975-1988 Repair Information

Axle Shaft, Bearing and Seal

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REMOVAL & INSTALLATION



See Figures 1 through and 12

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Fig. Fig. 1: Exploded view of the 7 9/16 in. ring gear rear axle with a standard differential



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Fig. Fig. 2: Exploded view of a Twin-Grip differential and related components



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Fig. Fig. 3: Remove the brake drum ...



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Fig. Fig. 4: ... then remove the cotter pin and axle shaft nut



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Fig. Fig. 5: Install a puller on the rear hub ...



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Fig. Fig. 6: ... then remove the rear hub from the axle assembly



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Fig. Fig. 7: Disconnect the parking brake cable at the equalizer



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Fig. Fig. 8: Unfasten the axle shaft oil seal retainer bolts ...



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Fig. Fig. 9: ... then remove the axle shaft oil seal and retainer assembly



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Fig. Fig. 10: Remove the axle shaft bearing shim



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Fig. Fig. 11: If necessary, remove the brake backing plate and brake assembly from the axle shaft



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Fig. Fig. 12: Use a screw type puller to remove the axle shaft and bearings

  1. The hub and drum are separate units and are removed after the wheel is removed. The hub and axle shaft are serrated together on the taper. An axle shaft key assures proper alignment during assembly.
  2.  
  3. With the wheel on the ground and the parking brake applied, remove and discard the axle shaft nut cotter pin and remove the nut. Raise the car and remove the wheel. Release the parking brakes and remove the drum.
  4.  
  5. Attach a puller to the rear hub and remove the hub. The use of a `Knock-out', or slide hammer, puller should be discouraged, since it may result in damage to the axle shaft or wheel bearings.
  6.  
  7. Disconnect the parking brake cable at the equalizer.
  8.  
  9. Disconnect the brake tube at the wheel cylinder and remove the brake support plate assembly, oil seal, and axle shims. Note that the axle shims are located on the left side only.
  10.  
  11. Using a screw type puller, remove the axle shaft and bearings from the axle housing.
  12.  


WARNING
On Twin-Grip® axles, rotating the differential with one shaft removed will misalign the side gear splines, preventing installation of the replacement shaft.

  1. Remove the axle shaft inner oil seal and install new seals at assembly.
  2.  
  3. The bearing is a press fit and should be removed with an arbor press.
  4.  

To install:
  1. The axle shaft bearings have no provision for lubrication after assembly. Before installing the bearings, they should be packed with a good quality wheel bearing lubricant.
  2.  
  3. Press the axle shaft bearings onto the axle shaft with the small diameter of the cone toward the outer (tapered) end of the shaft.
  4.  
  5. Soak the inner axle shaft seal in light lubricating oil. Coat the outer surface of the seal retainer with sealant.
  6.  
  7. Install the inner oil seal.
  8.  
  9. Install the axle shafts, indexing the splined end with the differential side gears.
  10.  
  11. Install the outer bearing cup.
  12.  
  13. Install the brake support plate. Sealant should be applied to the axle housing flange and brake support mounting plate.
  14.  
  15. Install the original shims, oil seal and brake support plate. Torque the nuts to 30-35 ft. lbs.
  16.  

The oil seal and retainer go between the axle housing flange and the brake support plate on 9 in. (228.6mm) brakes or 79/16in. (192mm) axle. On 10 in. (254mm) brakes or 87/8in. (225mm) axle, they go on the outside of the brake support plate.

  1. To adjust the axle shaft end-play, strike the axle shafts with a lead mallet to seal the bearings. Install a dial indicator on the brake support plate and check the play while pushing and pulling the axle shaft. End-play should be 0.004-0.008 in. (0.10-0.20mm), with 0.006 in. (0.15mm) desirable. Add shims to the left side only to decrease the play and remove shims to increase the play.
  2.  
  3. Slide the hub onto the axle shafts aligning the serrations and the keyway onto the hub with the axle shaft key.
  4.  
  5. Replace the hub and drum, install the wheel, lower the car onto the floor and tighten the axle shaft nut to 250 ft. lbs. If the cotter pin hole is not aligned with a castellation on the nut, tighten the nut to the next castellation.
  6.  

A new hub must be installed whenever a new axle shaft is installed.

  1. Install two thrust washers on the shaft. Tighten the new hub onto the shaft until the hub is 1.19 in. (30.2mm) from the end of the shaft on 7 9 / 16 in. (192mm) differentials, and 1.31 in. (33.2mm) on 8 7 / 8 in. (225mm) models. Remove the nut; remove one thrust washer. Install the nut and torque to 250 ft. lbs. New hubs do not have serrations on the axle shaft mating surface. The serrations are cut when the hub is installed to the axle shaft.
  2.  
  3. Connect the parking brake cable at the equalizer.
  4.  
  5. Connect the brake tube at the wheel cylinder and bleed the brakes.
  6.  

 
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