Here's a general overview of the process. Again, this is not a substitute for a proper repair manual:
1. Preparation:
* Gather Tools: You'll need a jack, jack stands (crucial for safety), wheel chocks, lug wrench, socket set (metric), possibly a bearing race installer/remover tool (or a suitable substitute like a socket and hammer – use caution!), a torque wrench, a hammer, possibly a pry bar, and penetrating oil (like PB Blaster). You may also need a hub puller depending on the specific design.
* Safety First: Always work on a level, stable surface. Engage the parking brake and use wheel chocks. Wear safety glasses and gloves.
* Consult Repair Manual: Find the section on rear wheel bearing replacement for your specific Focus model (sedan, wagon, etc.).
2. Removing the Wheel:
* Jack up the vehicle and securely support it with jack stands.
* Remove the wheel and tire.
3. Removing the Rotor/Drum (if applicable):
* Drum Brakes: Remove the brake drum. This may require tapping gently with a hammer and drift. If it's stuck, use penetrating oil and carefully pry it off. Inspect the brake shoes.
* Disc Brakes: Remove the caliper assembly (support it with a wire or bungee cord to prevent stress on the brake line). Remove the rotor. You might need to remove a retaining bolt or clip.
4. Removing the Axle Nut and Hub Assembly:
* Locate and remove the large axle nut (usually requires a very strong breaker bar). You will need to hold the rotor/hub assembly to prevent rotation while loosening this nut.
* Use a hub puller (if needed) to separate the hub assembly from the axle. Some models may allow removal with gentle persuasion and tapping, but a puller is recommended to prevent damage.
5. Removing the Old Bearing:
* This is where a bearing race and seal installer/remover tool is invaluable. These tools prevent damage to the bearing and the hub assembly.
* If you lack these tools, you'll need to carefully remove the old bearing and seals, likely requiring careful hammering and prying (extremely risky). Consult your repair manual for specific instructions as damage is easy at this stage.
6. Installing the New Bearing:
* Clean the hub thoroughly.
* Carefully install the new bearing and seals, using the appropriate tools (press fit). Hammering directly can easily damage the new bearing.
7. Reassembly:
* Carefully reverse the removal process.
* Install the hub assembly.
* Install the axle nut and tighten to the proper torque specification (found in your repair manual).
* Reinstall the rotor or drum and caliper.
* Mount the wheel and tire.
* Lower the vehicle.
* Check for proper wheel bearing play (it shouldn't have excessive movement).
Important Notes:
* Pressing bearings: If you're not experienced with pressing bearings, it's highly recommended you take the hub assembly to a professional mechanic or auto parts store that offers this service. Damage to the bearing during installation is very common for DIYers without proper tools.
* Torque Specifications: Using the correct torque wrench and the proper torque specification for the axle nut is crucial to avoid bearing failure and potential safety issues.
* ABS Sensors: If your Focus has Anti-lock Braking System (ABS), be careful with the ABS sensor and wiring during removal and reinstallation.
This is a complex repair. Again, using a repair manual specific to your 2002 Ford Focus is absolutely essential. If you're not comfortable with this type of repair, taking it to a qualified mechanic is the safest and often most cost-effective option in the long run.
