Here's what you need and the general procedure:
Tools You'll Need:
* Hub puller: This is absolutely essential. A specific type of puller designed for wheel hubs is needed, not a generic bearing puller. The puller will grip the hub itself to pull it off the knuckle.
* Race and bearing separator (or a suitable alternative): This tool is specifically designed to remove the inner and outer races from the hub. These are often specialized and may require different sizes depending on the bearing. You might find alternatives, like a suitable sized punch and hammer (very risky method), or a slide hammer with the right attachments. However, using the correct tool is strongly recommended to avoid damaging the hub.
* Sockets and wrenches: To remove the caliper, rotor, and cotter pin.
* Penetrating oil (like PB Blaster): This helps loosen any corrosion.
* Hammer (possibly): Use with extreme caution if using a makeshift race removal method. A brass or nylon hammer is safer to avoid marring the hub.
* Vice (possibly): To securely hold the hub while removing the races. Using a vice incorrectly can easily damage the hub.
Procedure:
1. Safety First: Always use jack stands when working under a car. Never rely on a jack alone. Wear safety glasses.
2. Remove the Wheel and Brake Components:
* Loosen the lug nuts.
* Lift the car and secure it with jack stands.
* Remove the wheel.
* Remove the brake caliper (support it to prevent hanging on the brake line).
* Remove the rotor.
3. Remove the Hub: This is where the hub puller is crucial. Consult your repair manual or look up a video for your specific vehicle to see the correct way to use the puller for your model. The puller will usually have a threaded bolt that is tightened to pull the hub from the knuckle. Applying penetrating oil beforehand can help.
4. Remove the Races: Once the hub is off, carefully examine it. Now you need to remove the inner and outer races. Use your race and bearing separator tool (or your carefully considered alternative method, but the tool is preferred) to carefully press the races out of the hub. Excessive force can damage the hub. Work slowly and methodically.
5. Clean the Hub: After removing the races, clean the hub thoroughly. Inspect it for any damage. If the hub is damaged, it will need to be replaced.
6. Installation (Reverse Order): Once you have the new bearings and races (always replace bearings in pairs), reverse the steps to install them. Make sure the new bearings are properly seated before reinstalling the hub. Using a bearing press will ensure they are correctly installed. This is critical for the long-term durability and safety of your wheel.
Important Notes:
* Repair Manual: A repair manual specific to your 1991 Geo Prizm is highly recommended. It will provide detailed diagrams and instructions for removing the hub and races.
* Professional Help: If you're not comfortable with this type of repair, it's best to take it to a qualified mechanic. Improperly removing the races or reinstalling the bearings can lead to serious damage and potentially dangerous driving conditions.
* Replacement Parts: Order the correct replacement hub, bearings, and races before starting the repair.
This process involves potential risks and requires mechanical aptitude. Proceed cautiously and consult a repair manual if you are unfamiliar with automotive repairs. If you are unsure about any part of this process, it's highly recommended you take it to a qualified professional.
