This process assumes some familiarity with automotive repair. Always consult your vehicle's repair manual for specific torque specifications and procedures. Improper torque can severely damage components.
Tools You'll Need:
* Jack and jack stands (SAFETY FIRST: Secure the vehicle properly)
* Wheel chocks
* Lug wrench
* Socket set (metric)
* Wheel bearing press (essential – trying to do this without one is very risky)
* Hammer and punch (possibly)
* Torque wrench
* Penetrating oil (PB Blaster, etc.)
* Grease gun and wheel bearing grease
* Pry bar (possibly)
* Axle nut socket (often a large size, possibly a 36mm)
* A cotter pin remover
* Clean rags
* Safety glasses and gloves
Steps:
1. Safety First: Park on a level surface, engage the parking brake, and chock the rear wheels. Raise the front of the Blazer using the jack and securely support it with jack stands. Remove the wheel.
2. Remove the caliper and rotor: Remove the caliper bolts and carefully hang the caliper out of the way using a wire or bungee cord. Don't let the brake line dangle. Remove the rotor (it might be stubborn, you may need to use a pry bar; penetrating oil is helpful).
3. Remove the axle nut: This is usually a large nut on the end of the axle shaft. Use the correct socket and considerable force. Penetrating oil is highly recommended. Once loose, unscrew it completely and set it aside. Note its position and any washers present.
4. Remove the cotter pin and castle nut: The castle nut holds the wheel bearing in place. Remove the cotter pin with a cotter pin remover. Then, unscrew the nut.
5. Remove the hub assembly: Some Blazers require removal of the ABS sensor before this step. There will be a few other bolts securing the hub assembly to the knuckle. Remove these. The hub assembly might be difficult to remove. A pry bar might be helpful, but use caution to avoid damage.
6. Press out the old bearing: This is where the wheel bearing press is absolutely crucial. Using the press, carefully remove the old inner and outer wheel bearings from the hub assembly. Take note of their orientation and any spacers.
7. Install the new bearings: Using the bearing press, carefully install the new bearings into the hub assembly. Make sure they're seated correctly and flush.
8. Reassembly: Reassemble everything in reverse order of disassembly, ensuring all components are properly seated and torqued to the manufacturer's specifications. This includes:
* Install hub assembly
* Install axle nut and tighten to specification. Install the cotter pin.
* Install rotor
* Install caliper
* Install wheel and tighten lug nuts
9. Torque specifications: Refer to your repair manual for the correct torque specifications for the axle nut and lug nuts. Improper torque is a major cause of wheel bearing failure.
10. Test drive: After reassembly, perform a test drive to ensure everything is working correctly. Listen carefully for any unusual noises emanating from the wheel area.
Important Considerations:
* ABS Sensor: Be very careful with the ABS sensor if your Blazer has it. Damage can lead to costly repairs.
* Bearing type: There are different types of wheel bearings. Make sure you order the correct replacement bearing for your specific model.
* Cleanliness: Keep everything clean throughout the process to prevent debris from contaminating the new bearings.
* Grease: Properly grease the new bearings before installation.
This is a detailed outline; specific steps might vary slightly depending on your particular Blazer model. Always refer to a repair manual for your specific vehicle before attempting this repair. Incorrectly installing wheel bearings can lead to serious accidents. If in doubt, consult a professional.
