Tools You'll Likely Need:
* Jack and jack stands: Absolutely crucial for safety. Never work under a car supported only by a jack.
* Wheel chocks: To prevent the car from rolling.
* Lug wrench: To remove the wheel.
* Impact wrench (highly recommended): Makes removing the axle nut much easier. A breaker bar and a lot of muscle will work, but an impact wrench saves time and frustration.
* Socket set: Various sizes will be needed.
* Hammer and punch: Possibly needed to break loose stubborn components.
* Penetrating oil (like PB Blaster): To loosen rusted or seized parts.
* Wheel bearing press (ideally): While you *might* be able to press the bearings in and out with a socket and hammer, a press makes the job much easier, safer, and less prone to damage. Improper installation can easily damage the bearing or hub.
* New rear wheel bearings and seals: Order the correct parts for your specific year and model Sunfire. Getting the wrong ones is a common mistake.
* C-clamp (possibly): Depending on the bearing press method used.
* Torque wrench: To tighten components to the manufacturer's specifications.
* Grease: Pack the new bearing with fresh grease.
* Shop rags: For cleanup.
General Steps (Consult your repair manual for precise details):
1. Safety First: Engage the parking brake, chock the front wheels, and raise the rear of the vehicle securely with the jack and jack stands.
2. Remove the Wheel: Remove the lug nuts and carefully take off the wheel.
3. Remove the Brake Caliper and Rotor: Disconnect the brake caliper from the caliper bracket (usually with a bolt or two) and carefully hang it out of the way using a wire or bungee cord to avoid stressing the brake line. Then remove the rotor.
4. Remove the Axle Nut: This is usually a very large nut. Use your impact wrench if possible. If using a breaker bar, be prepared for significant resistance. Mark the nut's position relative to the axle to ensure proper reinstallation.
5. Remove the Axle Flange: This might require separating the axle from the hub assembly. This often involves removing cotter pins and some more nuts and bolts. This step varies depending on the Sunfire's year and whether it has a solid or independent rear suspension. Your repair manual is crucial here.
6. Remove the Old Wheel Bearing: This is where the bearing press becomes essential. You'll need to carefully press out the old bearing from the hub. Doing this without a press is risky and likely to damage the bearing or hub.
7. Clean and Inspect: Thoroughly clean the hub assembly, removing any old grease or debris. Inspect the hub for any damage.
8. Install the New Wheel Bearing: Using the bearing press, carefully press the new bearing into the hub. Ensure it's seated properly.
9. Install New Seals (if applicable): Replace any worn or damaged seals.
10. Reassembly: Follow the disassembly steps in reverse order, remembering to pack the new bearing with grease. Ensure everything is torqued to the correct specification as per your repair manual.
11. Torque Specifications: This is incredibly important. Incorrect torque can lead to premature bearing failure and safety hazards.
12. Test Drive: After reassembly, test drive the vehicle to ensure everything is working correctly. Listen carefully for any unusual noises.
Important Considerations:
* Year and Model: The specific steps may vary slightly depending on the year and model of your Pontiac Sunfire.
* Repair Manual: A repair manual specific to your vehicle is indispensable. It will provide diagrams, torque specifications, and detailed instructions. Don't attempt this without one.
* Safety: Working on your car involves risks. If you're not comfortable with this task, take it to a qualified mechanic. Improperly installed wheel bearings can lead to serious accidents.
This information is for guidance only. Always consult a repair manual and exercise caution when working on your vehicle. Improper repair can be dangerous.
