Here's a general overview of the process. Again, this is not a substitute for a proper repair manual:
1. Preparation:
* Safety First: Jack up the vehicle securely using jack stands, never rely solely on a jack. Disconnect the negative battery terminal.
* Gather Tools: You'll need a jack, jack stands, wheel chocks, socket set (metric), torque wrench, ball joint separator, tie rod separator (possibly), a large C-clamp or hub press (essential), penetrating oil (like PB Blaster), a hammer, and possibly a slide hammer. A wheel bearing race and seal installer/remover set will also greatly simplify the job.
* Parts: Obtain the correct replacement wheel bearing hub assembly for your Bonneville. Make sure it's the correct part number for your vehicle.
2. Removal:
* Remove the Wheel: Loosen the lug nuts before jacking up the car. Remove the wheel.
* Disconnect Brake Caliper: Remove the caliper bolts and carefully hang the caliper out of the way using a wire or bungee cord. Do *not* let the brake line hang freely; support it to avoid damage.
* Disconnect ABS Sensor (if applicable): Carefully disconnect the ABS sensor wire from the hub.
* Disconnect Tie Rod End: Separate the tie rod end from the steering knuckle using a tie rod separator. This may require a pickle fork or similar tool. Take note of how it was positioned for reassembly.
* Remove the cotter pin and castle nut from the ball joint: Then carefully use a ball joint separator to separate the ball joint from the steering knuckle. Again, note the position.
* Remove the Axle Nut: Remove the large axle nut securing the hub to the spindle. This nut is often very tight and may require a breaker bar or impact wrench.
* Remove the Hub Assembly: With the axle nut and ball joint and tie rod removed, the hub assembly *should* be able to be removed by hand or with gentle persuasion. However, it is often very stubborn and requires a slide hammer or the hub puller. The hub is pressed onto the spindle, so a puller is generally needed.
3. Installation:
* Clean the Spindle: Thoroughly clean the spindle where the new hub will be pressed on. Remove any old grease or debris.
* Press on the New Hub: Use a hub press or a large C-clamp and suitable backing plates to carefully press the new hub onto the spindle. This requires even pressure and care to avoid damage. Using the correct tool is crucial here.
* Reassemble in Reverse Order: Carefully reassemble everything in the reverse order of removal, paying attention to the torque specifications for all bolts and nuts in your repair manual. This includes the axle nut, ball joint, and tie rod end. Make sure to properly torque the axle nut to the specifications listed in your manual.
* Reconnect the brake caliper and ABS sensor: Ensure the brake caliper is properly seated and secured.
* Reinstall the Wheel: Install the wheel and tighten the lug nuts to the proper torque specification.
4. Final Steps:
* Lower the Vehicle: Carefully lower the vehicle and check all fasteners are tight.
* Test Drive: Take a short test drive to verify the repair. Listen carefully for any unusual noises from the wheel bearing.
Important Considerations:
* Pressing Tools: Improper use of pressing tools can easily damage the new hub or spindle. If you don't have the proper tools, consider having a professional mechanic perform this repair.
* Torque Specifications: Failure to tighten bolts and nuts to the correct torque specifications can lead to premature failure or even dangerous situations.
* Safety: Always prioritize safety. Use jack stands and follow proper safety procedures.
This is a simplified overview. Consult a repair manual specific to your 1998 Pontiac Bonneville for detailed instructions and torque specifications. If you are unsure about any part of this process, it's best to seek professional assistance from a qualified mechanic. Improper installation can lead to serious safety risks.
