Isuzu Cars and Trucks 1981-1991

Rear Axle Shaft, Bearing and Seal

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REMOVAL AND INSTALLATION
RWD I-Mark and Impulse

CAUTION
Some brake pads contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

  1. Raise the car and support it safely with jackstands at the jack brackets.
  2.  
  3. Remove the wheel and brake drum assembly.
  4.  
  5. Working through the access holes in the axle shaft flange, remove the four nuts and washers that retain the axle shaft and bearing retainer.
  6.  
  7. Install an axle shaft puller (slap-hammer) and remove the axle shaft.
  8.  
  9. To replace the bearing parts, first remove the retaining ring by cutting it off with a chisel. The bearing must be pressed off with a suitable bench press.
  10.  

To install:

  1. Press the new bearing on to the axle shaft with a suitable press.
  2.  
  3. Check the axle shaft endplay by using a depth gauge to measure the depth of the rear axle bearing seat in the axle housing with the backing plate in place.
  4.  
  5. Measure the width of the bearing outer race. The difference between the two measurements indicates the required thickness of the shims. If necessary to increase endplay, add shims. To decrease endplay, remove shims. Standard endplay is 00.008 in. (0.2mm) thickness. Shims are only available in 0.006 in. (0.15mm) thickness.
  6.  
  7. Coat all rear axle components with gear oil before installation. Torque the lock washers and nuts to 28 ft. lbs. (38 Nm).
  8.  

FWD I-Mark

CAUTION
Some brake pads contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

  1. Raise the vehicle and support with jackstands.
  2.  
  3. Remove the rear wheels.
  4.  
  5. Remove the hub cap, split pin and hub nut.
  6.  
  7. Remove the washer, pull the drum off of the axle and remove the outer bearing.
  8.  
  9. Remove the oil seal using a suitable puller.
  10.  
  11. Remove the inner bearing.
  12.  
  13. If replacing the bearings, remove the outer bearing race by driving out the race with a brass drift. Remove the races from the hub notch.
  14.  

To install:

  1. Install the new races with a brass drift. Be careful not to damage the race, bearing damage will result.
  2.  
  3. Repack the bearings and hub with grease.
  4.  
  5. Install the inner bearing and oil seal.
  6.  
  7. Install the drum onto the axle and install the washer and hub nut.
  8.  
  9. Adjust the wheel bearings as follows: torque the nut to 22 ft. lbs. (30 Nm). Rotate the drum two times, loosen the nut completely and tighten the nut fully by hand.
  10.  
  11. Insert a new split pin and bend over.
  12.  
  13. Install the rear wheels and lower the vehicle.
  14.  



Click image to see an enlarged view

Fig. Rear wheel bearings FWD I-Mark

FWD Impulse and Stylus

CAUTION
Some brake pads contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

The hub and bearing are a complete assembly and can NOT be serviced separately.

  1. Raise the vehicle and support with jackstands.
  2.  
  3. Remove the brake drum or rotor from the hub as outlined in .
  4.  
  5. Remove the four retaining bolts and hub/bearing assembly.
  6.  
  7. Install the hub/bearing assembly and torque the bolts to 49 ft. lbs. (66 Nm).
  8.  
  9. Install the brake drum or rotor, rear wheels and lower the vehicle.
  10.  



Click image to see an enlarged view

Fig. Rear bearing/hub assembly FWD Impulse and Stylus

P'up, Amigo, Trooper and Amigo
AXLE SHAFT
  1. Raise and safely support the vehicle.
  2.  
  3. Remove the rear wheel assembly and brake drum.
  4.  
  5. Remove the 4 axle retainer bolts.
  6.  
  7. Using a slide hammer on the axle, pull the axle out of the housing.
  8.  
  9. To install, reverse the removal procedures.
  10.  
  11. Torque the axle retainer bolts to 51 and 1958 ft. lbs. (68 and 1981 Nm).
  12.  

PINION SEAL
  1. Raise and safely support the vehicle.
  2.  
  3. Matchmark and remove the driveshaft.
  4.  
  5. Check the turning torque of the pinion before proceeding. This is the torque that must be reached during installation of the pinion nut.
  6.  


NOTE
The amount of turning torque required to move the pinion gear should be 20 and 1930 ft. lbs. (27 and 1940 Nm) of torque.

  1. Using a pinion flange holding tool, remove the pinion nut and washer.
  2.  
  3. Remove the pinion flange from the pinion gear.
  4.  
  5. Pry the pinion seal out of the differential carrier.
  6.  
  7. Clean and inspect the sealing surface of the carrier.
  8.  

To install:

  1. Using a seal driver tool, drive the new seal into the carrier 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 while holding the flange, until the turning torque is the same as before removal of the nut.
  6.  
  7. Align the matchmarks and install the driveshaft.
  8.  
  9. Check the level of the differential lubricant when finished.
  10.  

AXLE SHAFT SEAL
  1. Raise and safely support the vehicle.
  2.  
  3. Remove the axle shaft from the housing.
  4.  
  5. Support the axle shaft and remove the bearing retainer locknut.
  6.  
  7. Remove the retainer, bearing and seal from the axle shaft.
  8.  
  9. Using a seal driver tool, remove the seal and install the new seal in the retainer.
  10.  

To install:

  1. Torque the bearing retainer nut to 188 and 19195 ft. lbs. (250 and 19275 Nm).
  2.  
  3. Check the level of the axle lubricant when finished.
  4.  

 
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