Here's a general outline of the process. Specific steps and torque specifications may vary slightly, so consult a repair manual specific to your 2002 Mercury Mountaineer. A Haynes or Chilton manual will be invaluable.
Tools you will likely need:
* Jack and jack stands: Absolutely essential for safety.
* Wheel chocks: For added safety.
* Lug wrench: To remove the wheel.
* Socket set and wrenches: Various sizes will be needed.
* Impact wrench (highly recommended): Makes removing and installing some parts much easier.
* Press or bearing separator: Essential for pressing out the old bearing and pressing in the new one. A slide hammer might help with removal, but a press is ideal.
* Penetrating lubricant (PB Blaster or similar): To help loosen rusted bolts.
* Torque wrench: Crucial for tightening bolts to the correct specifications.
* New rear wheel bearing: Make sure to get the correct part number for your vehicle.
* New ABS sensor ring (if necessary): The ring might be damaged during the process or worn out.
* New axle nut: Often recommended to replace this nut as it's a critical safety component.
* Clean rags and gloves: Keep things clean to avoid contamination.
* Safety glasses and possibly a face shield: Protect your eyes.
General Steps (Consult your repair manual for precise details):
1. Safety First: Secure the vehicle with jack stands. Engage the parking brake and use wheel chocks on the opposite wheels.
2. Remove the Wheel: Remove the lug nuts and take off the wheel.
3. Remove the Brake Caliper and Rotor: Remove the caliper bolts and carefully hang the caliper out of the way. You might need to compress the caliper piston. Then, remove the rotor.
4. Remove the Axle Nut: This is often very tight; an impact wrench is strongly advised. Note the orientation of the nut and washer. You'll need to replace this nut.
5. Remove the Hub Assembly: Depending on your Mountaineer's setup, you may need to remove some other components like cotter pins, ABS sensor, and possibly a retaining ring or a few other bolts. Your repair manual will show you which components need to be removed. This is the most challenging part.
6. Press Out the Old Bearing: This requires a bearing press or other suitable tool. Do this carefully to avoid damaging the hub.
7. Press In the New Bearing: Again, use a press to install the new bearing correctly and evenly.
8. Reassembly: Reverse the disassembly steps, ensuring everything is properly seated and torqued to the correct specifications as outlined in your repair manual. Pay close attention to the torque settings for the axle nut. This is critical for safety.
9. Torque Specifications: Use a torque wrench to tighten all bolts to the manufacturer's specified torque values.
10. Test Drive: After reassembly, take a short test drive to check for any unusual noises or vibrations.
Important Considerations:
* ABS Sensor: If the ABS sensor is damaged during removal, it needs replacement.
* Wheel Bearing Races: Sometimes the races (the inner and outer rings in which the bearing rotates) are also damaged and may need to be replaced.
* Proper Lubrication: Follow the manufacturer's instructions regarding lubrication for the new bearing and any other components.
This is a simplified overview. Always consult a repair manual specific to your 2002 Mercury Mountaineer before attempting this repair. Failure to follow proper procedures can lead to damage to your vehicle and potentially serious injury. If you are unsure about any step, it's best to seek professional help.
