At a Glance
- Replacing a rear wheel bearing on a BMW E46 is a task that may seem daunting, but with the right guidance and preparation, it can be a manageable DIY project.
- Use the 21mm socket to remove the bolts securing the rotor to the hub.
- Place the wheel back onto the hub and tighten the lug nuts to the specified torque.
Replacing a rear wheel bearing on a BMW E46 is a task that may seem daunting, but with the right guidance and preparation, it can be a manageable DIY project. In this comprehensive guide, we will delve into the intricacies of this repair, providing you with a step-by-step walkthrough and essential tips to ensure a successful outcome.
Tools and Materials Required
Before embarking on this project, gather the following tools and materials:
- 19mm and 21mm sockets
- Torx socket set
- Wheel bearing puller
- Slide hammer
- Axle nut socket
- New rear wheel bearing
- New axle nut
- Brake cleaner
- Anti-seize compound
- Torque wrench
Safety Precautions
Prioritize safety by adhering to these precautions:
- Park the vehicle on a level surface and engage the parking brake.
- Use wheel chocks to prevent the vehicle from rolling.
- Wear appropriate safety gear, including gloves and safety glasses.
Step-by-Step Guide
1. Remove the Rear Wheel
Use the 19mm socket to loosen the lug nuts on the affected wheel. Do not remove them completely. Jack up the vehicle and remove the lug nuts, then pull the wheel off the hub.
2. Remove the Brake Caliper
Unbolt the two Torx bolts holding the brake caliper in place. Lift the caliper off the rotor and secure it out of the way with a bungee cord.
3. Remove the Rotor
Use the 21mm socket to remove the bolts securing the rotor to the hub. Carefully pull the rotor off the hub.
4. Remove the Axle Nut
Locate the axle nut in the center of the hub. Use the axle nut socket to loosen and remove the nut.
5. Remove the Wheel Bearing
Use the wheel bearing puller to remove the old wheel bearing from the hub. It may be necessary to use a slide hammer if the bearing is stuck.
6. Install the New Wheel Bearing
Apply anti-seize compound to the hub and the new wheel bearing. Press the new bearing into the hub using a press or a suitable tool.
7. Reinstall the Axle Nut
Tighten the axle nut to the specified torque using a torque wrench.
8. Reinstall the Rotor
Place the rotor back onto the hub and secure it with the bolts. Tighten the bolts to the specified torque.
9. Reinstall the Brake Caliper
Mount the brake caliper back onto the rotor and secure it with the Torx bolts. Tighten the bolts to the specified torque.
10. Reinstall the Wheel
Place the wheel back onto the hub and tighten the lug nuts to the specified torque. Lower the vehicle and fully tighten the lug nuts.
Summary: Ensuring a Smooth Drive
By following these steps meticulously, you have successfully replaced the rear wheel bearing on your BMW E46. This repair will not only restore the smooth operation of your vehicle but also enhance its overall performance. Remember to regularly check your wheel bearings to prevent premature wear and potential complications.
What You Need to Know
1. What are the symptoms of a bad rear wheel bearing on a BMW E46?
- Grinding or humming noise from the affected wheel
- Vibration or wobbling while driving
- Increased tire wear on the affected wheel
2. How often should I replace my rear wheel bearings?
The frequency of replacement depends on driving conditions and habits. Generally, it is recommended to inspect the wheel bearings every 50,000 to 75,000 miles.
3. Can I drive with a bad rear wheel bearing?
Driving with a bad rear wheel bearing can be dangerous. It can cause the wheel to seize, leading to loss of control and potential accidents.