Here's a general overview of the process. Remember, this is a simplified guide and may not cover every detail. Refer to your shop manual for precise instructions.
Tools You'll Likely Need:
* Jack and jack stands: Essential for safe vehicle lifting.
* Wheel chocks: To secure the vehicle.
* Lug wrench: To remove the wheel.
* Socket set and wrenches: Various sizes will be needed.
* Ball joint separator: To separate the ball joint from the control arm.
* Tie rod end separator: To separate the tie rod from the steering knuckle.
* Hammer and punch: Possibly needed for stubborn parts.
* Bearing press (or a suitable substitute): Absolutely crucial for properly pressing out and in the bearings. Improper installation can severely damage the new bearings.
* Torque wrench: Essential for tightening bolts to the correct specifications.
* Penetrating oil (like PB Blaster): To loosen rusted or seized bolts.
* Shop rags or paper towels: To keep things clean.
* Safety glasses and gloves: Always protect yourself.
General Steps (Highly Simplified):
1. Safety First: Secure the vehicle on level ground using jack stands and chocks. Disconnect the negative battery terminal.
2. Remove the Wheel: Remove the lug nuts and take off the wheel.
3. Disconnect Brake Caliper: Usually involves removing a couple of bolts to allow the caliper to hang loosely. You might need to support the caliper with wire or a bungee cord to avoid stressing the brake line.
4. Disconnect ABS Sensor (if applicable): Carefully disconnect the ABS sensor wire.
5. Disconnect Tie Rod End: Use a tie rod end separator to separate the tie rod from the steering knuckle. Take note of its position before removal for proper reinstallation.
6. Disconnect Ball Joint: Use a ball joint separator to separate the ball joint from the control arm. Again, note the position.
7. Remove the Steering Knuckle: This is usually held on by a few bolts.
8. Remove the Old Wheel Bearing: This is where the bearing press is vital. You'll need to press out the old bearing from the knuckle. This is often the most challenging part. Improper removal can damage the hub assembly.
9. Install the New Wheel Bearing: Using the bearing press, carefully press the new bearing into the knuckle. Ensure it's seated correctly and evenly.
10. Reassemble Everything: Carefully reverse the removal steps. Pay close attention to the position of the tie rod and ball joint. Tighten all bolts to the proper torque specifications as indicated in your shop manual.
11. Torque Specifications: This is critically important. Incorrect torque can lead to premature bearing failure or other damage.
12. Test Drive: After reassembly, test drive the vehicle to ensure everything functions correctly. Check for unusual noises or vibrations.
Warnings:
* This is a complex procedure. If you're not comfortable working on car parts, take it to a qualified mechanic. Improper installation can lead to serious safety issues.
* Use a shop manual: A shop manual specific to your 2003 Pontiac Alero is essential for detailed instructions and torque specifications.
* Bearing Press: Do not attempt this without a proper bearing press. Improper installation will ruin the new bearing and potentially damage other components.
* Safety: Always prioritize safety. Use jack stands, chocks, and safety glasses.
This is a very general outline. Consult your shop manual for the specific procedures and torque specifications for your vehicle. Improper installation can lead to dangerous consequences. If you have any doubts, take your Alero to a qualified mechanic.
