Mazda Trucks 1987-1993 Repair Guide

Front Wheel Bearings

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REMOVAL & INSTALLATION



Pickup With Rear Wheel Drive

SeeChapter 7for servicing 4WD models.

  1. Raise and safely support the vehicle. Remove the wheel and tire assembly.
  2.  
  3. Remove the brake caliper and support it with mechanics wire. Do not let the caliper hang by the brake hose.
  4.  
  5. Remove the grease cap, cotter pin, retainer, adjusting nut and washer. Discard the cotter pin.
  6.  
  7. Remove the outer bearing and pull the hub and rotor off the spindle. Remove the grease seal using a seal removal tool. Discard the grease seal.
  8.  
  9. Remove the inner bearing from the hub. Remove all traces of old lubricant from the bearings, hub and spindle with solvent and dry thoroughly.
  10.  
  11. Inspect the bearings and bearing races for scratches, pits or cracks. If the bearings and/or races are worn or damaged, remove the races with a brass drift.
  12.  

To install:
  1. If the bearing races were removed, install new races in the hub with suitable installation tools. Make sure the races are properly seated.
  2.  
  3. Using a bearing packer, pack the bearings with high-temperature wheel bearing grease. If a packer is not available, work as much grease as possible between the rollers and cages by hand.
  4.  
  5. Place a small amount of grease within the hub and grease the races. Install the inner bearing. Install a new wheel seal using a seal installer. Apply grease to the lips of the seal.
  6.  
  7. Install the hub and rotor assembly on the spindle. Install the outer bearing, washer and adjusting nut. Adjust the bearings.
  8.  
  9. Install the retainer, a new cotter pin and the grease cap.
  10.  
  11. Install the caliper and the wheel and tire assembly. Lower the vehicle.
  12.  
  13. Before driving the vehicle, pump the brake pedal several times to restore normal brake travel.
  14.  

MPV Models

REAR WHEEL DRIVE

See Figures 1 through 8



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Fig. Fig. 1: Remove the dust cap from the wheel hub, using pliers, if necessary



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Fig. Fig. 2: Installing the dust cap onto the wheel hub using a hammer and a 2 3/8 inch socket



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Fig. Fig. 3: If the wheel hub retaining nut was staked previously, open it up using a hammer and a punch or drift



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Fig. Fig. 4: Using a 34mm deep well socket, remove the wheel hub retaining nut



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Fig. Fig. 5: Remove the whel hub/bearing assembly by sliding straight off of the spindle



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Fig. Fig. 6: Be sure to clean the spindle area of any debris using a towel

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the wheel assembly.
  4.  
  5. Remove the hub dust cap.
  6.  
  7. Remove the locknut.
  8.  
  9. Remove the brake caliper.
  10.  
  11. Remove the disc plate.
  12.  
  13. Remove the hub assembly.
  14.  

To install:


Click image to see an enlarged view

Fig. Fig. 7: After installing the wheel hub/bearing assembly and retaining nut, use a torque wrench to tighten the nut



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Fig. Fig. 8: Using a hammer and a punch or drift, stake the hub/bearing retaining nut onto the spindle

  1. Install the hub assembly.
  2.  
  3. Install the disc plate.
  4.  
  5. Install the brake caliper, torque the mounting bolts to 66-79 ft. lbs. (89-107 Nm).
  6.  
  7. Install the locknut, torque to 131-173 ft. lbs. (117-235 Nm).
  8.  
  9. Using a hammer and a punch or drift, stake the hub/bearing retaining nut onto the spindle.
  10.  
  11. Install the hub dust cap.
  12.  
  13. Install the wheel assembly.
  14.  
  15. Lower the vehicle.
  16.  

4-WHEEL DRIVE

See Figure 9



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Fig. Fig. 9: Front hub and related components, exploded view-4WD

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the wheel assembly.
  4.  
  5. Remove the locknut.
  6.  
  7. Remove the brake caliper.
  8.  
  9. Remove the disc plate retaining screw(s).
  10.  
  11. Disconnect the tie-rod end from the knuckle.
  12.  
  13. Disconnect the lower ball joint.
  14.  
  15. Remove the disc plate.
  16.  
  17. Remove the ball joint mounting nuts and bolts.
  18.  
  19. Remove the knuckle, wheel hub and dustplate as an assembly.
  20.  
  21. Remove the wheel hub/bearing assembly from the knuckle.
  22.  

To install:
  1. Install wheel hub/bearing assembly to the knuckle.
  2.  
  3. Install the knuckle assembly. Torque the strut mounting nut to 69-86 ft. lbs. (94-116 Nm).
  4.  
  5. Install the ball joint mounting nuts and bolts. Torque the upper mounting bolts to 76-101 ft. lbs. (102-137 Nm). Torque the through-bolt nut to 95-106 ft. lbs. (128-171 Nm).
  6.  
  7. Replace the disc plate.
  8.  
  9. Install ball joint to the knuckle assembly. Torque the ball joint nut to 116-137 ft. lbs. (157-186 Nm).
  10.  
  11. Connect the tie-rod end, torque the nut to 44-57 ft. lbs. (59-78 Nm).
  12.  
  13. Install the brake caliper, torque the mounting bolts to 66-79 ft. lbs. (89-107 Nm).
  14.  
  15. Install the disc plate retaining nut.
  16.  
  17. Install the locknut, torque to 174-231 ft. lbs. (236-313 Nm).
  18.  
  19. Install the wheel assembly.
  20.  
  21. Lower the vehicle.
  22.  

Navajo With Rear Wheel Drive

SeeChapter 7for servicing 4WD models.

  1. Raise and support the vehicle safely. Remove the tire and wheel assembly from the hub and rotor.
  2.  
  3. Remove the caliper from its mounting and position it to the side with mechanics wire in order to prevent damage to the brake line hose.
  4.  
  5. Remove the grease cap from the hub. Remove the cotter pin, retainer, adjusting nut and flatwasher from the spindle.
  6.  
  7. Remove the outer bearing cone and roller assembly from the hub. Remove the hub and rotor from the spindle.
  8.  
  9. Using seal removal tool 1175-AC or equivalent remove and discard the grease seal. Remove the inner bearing cone and roller assembly from the hub.
  10.  
  11. Clean the inner and outer bearing assemblies in solvent. Inspect the bearings and the cones for wear and damage. Replace defective parts, as required.
  12.  
  13. If the cups are worn or damaged, remove them with front hub remover tool T81P-1104-C and tool T77F-1102-A or equivalent.
  14.  
  15. Wipe the old grease from the spindle. Check the spindle for excessive wear or damage. Replace defective parts, as required.
  16.  

To install:
  1. If the inner and outer cups were removed, use bearing driver handle tool T80-4000-W or equivalent and replace the cups. Be sure to seat the cups properly in the hub.
  2.  
  3. Use a bearing packer tool and properly repack the wheel bearings with the proper grade and type grease. If a bearing packer is not available work as much of the grease as possible between the rollers and cages. Also, grease the cone surfaces.
  4.  
  5. Position the inner bearing cone and roller assembly in the inner cup. A light film of grease should be included between the lips of the new grease retainer (seal).
  6.  
  7. Install the retainer using the proper installer tool. Be sure that the retainer is properly seated.
  8.  
  9. Install the hub and rotor assembly onto the spindle. Keep the hub centered on the spindle to prevent damage to the spindle and the retainer.
  10.  
  11. Install the outer bearing cone and roller assembly and flatwasher on the spindle. Install the adjusting nut. Adjust the wheel bearings.
  12.  
  13. Install the retainer, a new cotter pin and the grease cap. Install the caliper.
  14.  
  15. Lower the vehicle and tighten the lug nuts to 100 ft. lbs. Before driving the vehicle pump the brake pedal several times to restore normal brake pedal travel.
  16.  


CAUTION
Tighten the wheel lug nuts to specification after about 500 miles of driving. Failure to do this could result in the wheel coming off while the vehicle is in motion possibly causing loss of vehicle control or collision.

ADJUSTMENT



Pickup With Rear Wheel Drive
  1. Raise and safely support the vehicle. Remove the wheel and tire assembly.
  2.  
  3. Remove the brake caliper and suspend it aside with rope or mechanics wire; do not let the caliper hang by the brake hose.
  4.  
  5. Remove the dust cap and cotter pin.
  6.  
  7. Tighten the locknut to 14-22 ft. lbs. (20-29 Nm) and turn the hub and rotor 2-3 times to seat the bearings.
  8.  
  9. Loosen the locknut until it can be turned by hand.
  10.  
  11. Attach a suitable pull scale to a wheel lug bolt and measure the frictional force.
  12.  
  13. Tighten the locknut until the pull scale reading, the initial turning torque, reaches the frictional force plus 1.3-2.4 lbs. Insert the retainer and secure with a new cotter pin.
  14.  
  15. Install the dust cap and the caliper. Install the wheel and tire assembly and lower the vehicle.
  16.  
  17. Before driving the vehicle, pump the brake pedal several times to restore normal brake travel.
  18.  

Navajo With Rear Wheel Drive

See Figure 10



Click image to see an enlarged view

Fig. Fig. 10: 2WD wheel bearing adjustment

  1. Raise and support the vehicle safely. Remove the wheel cover. Remove the grease cap from the hub.
  2.  
  3. Wipe the excess grease from the end of the spindle. Remove the cotter pin and retainer. Discard the cotter pin.
  4.  
  5. Loosen the adjusting nut 3 turns.
  6.  


CAUTION
Obtain running clearance between the disc brake rotor surface and shoe linings by rocking the entire wheel assembly in and out several times in order to push the caliper and brake pads away from the rotor. An alternate method to obtain proper running clearance is to tap lightly on the caliper housing. Be sure not to tap on any other area that may damage the disc brake rotor or the brake lining surfaces. Do not pry on the phenolic caliper piston. The running clearance must be maintained throughout the adjustment procedure. If proper clearance cannot be maintained, the caliper must be removed from its mounting.

  1. While rotating the wheel assembly, tighten the adjusting nut to 17-25 ft. lbs. in order to seat the bearings. Loosen the adjusting nut a half turn. Tighten the adjusting nut 18-20 inch lbs.
  2.  
  3. Place the retainer on the adjusting nut. The castellations on the retainer must be in alignment with the cotter pin holes in the spindle. Once this is accomplished install a new cotter pin and bend the ends to insure its being locked in place.
  4.  
  5. Check for proper wheel rotation. If correct, install the grease cap and wheel cover. If rotation is noisy or rough recheck your work and correct as required.
  6.  
  7. Lower the vehicle and tighten the lug nuts to 100 ft. lbs., if the wheel was removed. Before driving the vehicle pump the brake pedal several times to restore normal brake pedal travel.
  8.  


CAUTION
If the wheel was removed, tighten the wheel lug nuts to specification after about 500 miles of driving. Failure to do this could result in the wheel coming off while the vehicle is in motion possibly causing loss of vehicle control or collision.

MPV Models

The wheel hub/bearing assembly used on both rear- and 4-wheel drive models is a non-adjustable component. No adjustments can be made, nor are any possible. However, the wheel bearing can be inspected as follows:

  1. Raise and support the vehicle safely. Remove the tire and wheel assembly.
  2.  
  3. Remove and properly support the caliper assembly.
  4.  
  5. Position a dial indicator gauge against the dust cap. Push and pull the disc brake rotor or brake drum in and out in the axial direction and measure the end-play of the wheel bearing.
  6.  
  7. End-play should not exceed 0.002 in. (0.05mm).
  8.  
  9. If end-play is excessive, check the hub nut torque or replace the bearing.
  10.  

 
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