This process is generally the same for front and rear wheel bearings, but there might be slight variations depending on the specific year and model of your Silhouette. Always consult a repair manual specific to your vehicle's year and model for precise instructions and torque specifications. A Haynes or Chilton manual is a good investment.
Here's a general outline of the steps involved. Remember, this is a *general overview* and may not be perfectly accurate for your specific vehicle:
1. Preparation:
* Safety First: Jack up the vehicle securely using jack stands. Never work under a vehicle supported only by a jack. Disconnect the negative battery terminal.
* Gather Tools: You'll need a jack, jack stands, wheel chocks, lug wrench, socket set (metric), torque wrench, ball joint separator (possibly), hammer, pry bar, grease gun, new wheel bearing (and seal, if applicable), and possibly a bearing race installer/remover tool.
* Consult Repair Manual: Locate the specific instructions for your vehicle's year and model. Pictures and diagrams are invaluable.
2. Removing the Wheel and Brake Components:
* Remove the wheel: Loosen the lug nuts before jacking up the vehicle. Remove the wheel.
* Remove the caliper: Remove the caliper bolts and carefully hang the caliper out of the way using a bungee cord or wire. Do not let the brake line hang freely.
* Remove the rotor (if applicable): If necessary, remove the rotor. Sometimes this involves removing the caliper bracket as well.
* Remove the axle nut: This may require a large socket and a breaker bar or impact wrench. Note the position of the nut in relation to the axle; you'll need to reinstall it in the same orientation.
3. Removing the Hub Assembly:
* Disconnect the ABS sensor (if applicable): Carefully disconnect the ABS sensor wire from the hub assembly.
* Remove the cotter pin and castle nut: This holds the hub assembly in place.
* Separate the hub assembly from the knuckle: This can be challenging and may require the use of a ball joint separator. The hub assembly is pressed onto the knuckle, so you'll likely need to carefully use a hammer and pry bar (or specialized hub puller) to separate them.
4. Replacing the Wheel Bearing:
* Press out the old bearing: This typically requires a bearing race and seal puller or press. The old bearing is likely pressed into the hub assembly.
* Press in the new bearing: Use the appropriate tool to press the new bearing into the hub assembly.
* Install the new seal (if applicable): Install the new seal if one was included with the new bearing.
5. Reassembly:
* Reinstall the hub assembly: Carefully align the hub assembly and reinstall it onto the knuckle.
* Reinstall the axle nut: Tighten the nut to the manufacturer's specified torque.
* Reinstall the cotter pin: Secure the axle nut with the cotter pin.
* Reinstall the rotor (if applicable): Reinstall the rotor, caliper bracket, and caliper.
* Reinstall the wheel: Tighten the lug nuts to the manufacturer's specified torque.
* Lower the vehicle: Lower the vehicle and double-check that everything is properly tightened.
6. Post-Installation Check:
* Test drive: Take a test drive to ensure the bearing is working correctly. Listen for any unusual noises. If there are any issues, take the vehicle to a mechanic.
Important Considerations:
* Torque Specifications: Using the correct torque is crucial to avoid damage. Use a torque wrench and refer to your repair manual for the exact specifications.
* Preloading: Wheel bearings require a specific amount of preload. Improper preload can lead to premature bearing failure. Your repair manual will provide instructions on how to achieve the correct preload.
* Cleanliness: Keep everything clean to avoid introducing dirt and debris into the new bearing.
Replacing wheel bearings is a demanding job. If you're unsure about any step, consult a professional mechanic. A poorly done job can lead to serious safety issues. Remember to always prioritize safety and refer to your vehicle's repair manual for precise instructions.
