Pontiac Fiero 1984-1988 Repair Guide

Front Wheel Bearings

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ADJUSTMENT



1984-87 Models

To maintain proper functioning of the front suspension, the front wheel bearings should be lubricated and correctly adjusted every 30,000 miles.


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 front wheels each rotate on a set of opposed, tapered roller bearings. The grease retainer at the inside of the hub prevents lubricant from leaking into the brake drum.

  1. Raise and support the front end on jackstands.
  2.  
  3. Remove the grease cap and remove excess grease from the end of the spindle.
  4.  
  5. Remove the cotter pin and nut lock.
  6.  
  7. Rotate the wheel, hub and drum assembly while tightening the adjusting nut to 17-25 ft. lbs. (23-34 Nm) in order to seat the bearings.
  8.  
  9. Back off the adjusting nut 1 / 2 , then retighten the adjusting nut to 10-15 inch. lb. (1.2-1.8 Nm).
  10.  
  11. Locate the nut lock on the adjusting nut so that the castellations on the lock are lined up with the cotter pin hole in the spindle.
  12.  
  13. Install the new cotter pin, bending the ends of the cotter pin around the castellated flange of the nut lock.
  14.  
  15. Check the wheel for proper rotation, then install the grease cap. If the wheel still does not rotate properly, inspect and clean or replace the wheel bearings and cups.
  16.  

REMOVAL, REPACKING & INSTALLATION



1984-87 Models


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Fig. Fig. 1 Removal and installation the disc brake caliper



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Fig. Fig. 2 Pry the dust cap from the hub taking care not to distort or damage its flange



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Fig. Fig. 3 Once the bent ends are cut, grasp the cotter pin and pull or pry it free of the spindle



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Fig. Fig. 4 If difficulty is encountered, gently tap on the pliers with a hammer to help free the cotter pin



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Fig. Fig. 5 Loosen and remove the castellated nut from the spindle



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Fig. Fig. 6 Remove the washer from the spindle



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Fig. Fig. 7 With the nut and washer out of the way, the outer bearings may be removed from the hub



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Fig. Fig. 8 Pull the hub and inner bearing assembly from the spindle



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Fig. Fig. 9 Use a small prytool to remove the old inner bearing seal



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Fig. Fig. 10 With the seal removed, the inner bearing may be withdrawn from the hub



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Fig. Fig. 11 Thoroughly pack the bearing with fresh, high temperature wheel-bearing grease before installation



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Fig. Fig. 12 Apply a thin coat of fresh grease to the new inner bearing seal lip



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Fig. Fig. 13 Use a suitably sized driver to install the inner bearing seal to the hub



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Fig. Fig. 14 After the bearings are adjusted, install the dust cap by gently tapping on the flange-DO NOT damage the cap by hammering on the center


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.

Before handling the bearings, there are a few things that you should remember to do and not to do.

Remember to DO the following:


Remove all outside dirt from the housing before exposing the bearing.
 
Treat a used bearing as gently as you would a new one.
 
Work with clean tools in clean surroundings.
 
Use clean, dry canvas gloves, or at least clean, dry hands.
 
Clean solvents and flushing fluids are a must.
 
Use clean paper when laying out the bearings to dry.
 
Protect disassembled bearings from rust and dirt. Cover them up.
 
Use clean rags to wipe bearings.
 
Keep the bearings in oil-proof paper when they are to be stored or are not in use.
 
Clean the inside of the housing before replacing the bearing.
 

Do NOT do the following:


Don't work in dirty surroundings.
 
Don't use dirty, chipped or damaged tools.
 
Try not to work on wooden work benches or use wooden mallets.
 
Don't handle bearings with dirty or moist hands.
 
Do not use gasoline for cleaning; use a safe solvent.
 
Do not spin-dry bearings with compressed air. They will be damaged.
 
Do not spin dirty bearings.
 
Avoid using cotton waste or dirty cloths to wipe bearings.
 
Try not to scratch or nick bearing surfaces.
 
Do not allow the bearing to come in contact with dirt or rust at any time.
 

  1. Raise and support the front end on jackstands.
  2.  
  3. Remove the wheel cover. Remove the wheel.
  4.  
  5. Remove the caliper from the disc and wire it to the underbody to prevent damage to the brake hose. .
  6.  
  7. Remove the grease cap from the hub. Then, remove the cotter pin, nut lock, adjusting nut and flat washer from the spindle. Remove the outer bearing assembly from the hub.
  8.  
  9. Pull the hub and disc assembly off the wheel spindle.
  10.  
  11. Remove and discard the old grease retainer. Remove the inner bearing cone and roller assembly from the hub.
  12.  
  13. Clean all grease from the inner and outer bearing cups with solvent. Inspect the cups for pits, scratches, or excessive wear. If the cups are damaged, remove them with a drift.
  14.  
  15. Clean the inner and outer cone and roller assemblies with solvent and shake them dry. If the cone and roller assemblies show excessive wear or damage, replace them with the bearing cups as a unit.
  16.  
  17. Clean the spindle and the inside of the hub with solvent to thoroughly remove all old grease.
  18.  


WARNING
Do not submerge the rotor and hub assembly in solvent to clean the bearing areas. The porous medal will absorb the solvent and cause the new bearing grease to melt. Put a small amount of solvent on a clean rag and wipe the bearing area clean. Use a dry clean rag to wipe out the solvent still inside hub.

  1. Covering the spindle with a clean cloth, brush all loose dirt and dust from the brake assembly. Remove the cloth carefully so as to not get dirt on the spindle.
  2.  
  3. If the inner and/or outer bearing cups were removed, install the replacement cups on the hub. Be sure that the cups seat properly in the hub.
  4.  
  5. It is imperative that all old grease be removed from the bearings and surrounding surfaces before repacking. Coat both bearings, bearing areas in the hub, grease seal and spindle with lithium-based grease. The new lithium-based grease is not compatible with the sodium base grease used in the past.
  6.  
  7. Install the hub and disc on the wheel spindle. To prevent damage to the grease seal and spindle threads, keep the hub centered on the spindle.
  8.  
  9. Install the outer bearing cone and roller assembly and the flat washer on the spindle. Install the adjusting nut.
  10.  
  11. Adjust the wheel bearings by torquing the adjusting nut to 17-25 ft. lbs. (23-34 Nm) with the wheel rotating to seat the bearing. Then back off the adjusting nut 1 / 2 turn. Retighten the adjusting nut to 10-15 inch. lb. (1.2-1.8 Nm). Install the locknut so that the castellations are aligned with the cotter pin hole. Install the cotter pin. Bend the ends of the cotter pin around the castellations of the locknut to prevent interference with the radio static collector in the grease cap. Install the grease cap.
  12.  


WARNING
New bolts must be used when servicing floating caliper units. The upper bolt must be tightened first. For floating caliper units, see .

  1. Install the wheels.
  2.  
  3. Install the wheel cover, if so equipped.
  4.  

1988 Models


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Fig. Fig. 15 Sealed bearing diagnosis chart-1988 models

The 1988 models are equipped with sealed hub and bearing assemblies. Refer to the "Sealed Wheel Bearing Diagnosis Chart" in this section.


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 wheel and tire assembly.
  4.  
  5. Remove the brake caliper and support with a wire to the surrounding body.
  6.  
  7. Remove the rotor assembly.
  8.  
  9. Remove the three hub and bearing assembly-to-steering knuckle attaching bolts.
  10.  
  11. Press out the old bearing using an arbor press and press in new bearings.
  12.  
  13. To install: place the hub and bearing assembly on the spindle. Install the hub and bearing assembly-to-steering knuckle attaching bolts and torque to 220 ft. lbs. (260 Nm). Install the brake caliper and torque the mounting bolts to 74 ft. lbs. (100 Nm). Install the wheel and tire assembly. Lower the vehicle and pump the brake pedal a few times before moving the vehicle.
  14.  

 
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