Here's a general outline of the process. Specific steps may vary slightly depending on your Blazer's trim level and whether you have 2WD or 4WD. Always consult a repair manual specific to your year and model Blazer for precise instructions and torque specifications. A Haynes or Chilton manual is a good investment.
Tools You'll Likely Need:
* Jack and jack stands: Absolutely essential for safety. Never work under a vehicle supported only by a jack.
* Wheel chocks: To secure the other wheels.
* Lug wrench: To remove the wheel.
* Socket set and wrenches: Various sizes will be needed, including metric and possibly SAE.
* Hammer and punch: For removing and installing components.
* Bearing press: This is crucial for safely removing and installing the bearings. Improperly using other methods can damage the bearings or hub. A slide hammer can *help* with removal, but a press is generally needed for both removal and installation.
* Pickle fork (optional but helpful): To separate ball joints (if needed depending on the hub design). Use caution; pickle forks can damage components if misused.
* Torque wrench: Absolutely necessary for tightening bolts to the correct specifications. Incorrect torque can lead to premature failure or damage.
* Penetrating oil (PB Blaster, etc.): To loosen rusted or seized bolts.
* Grease: For repacking the new bearings.
* New wheel bearings and seals: Purchase these from a reputable parts supplier, ensuring they are the correct part for your Blazer.
General Steps (Consult your repair manual for precise details):
1. Safety First: Park on a level surface, engage the parking brake, and chock the wheels. Raise the vehicle using the jack and securely support it with jack stands.
2. Remove the Wheel and Tire: Remove the lug nuts and carefully remove the wheel.
3. Remove the Brake Caliper: Unbolt the caliper and carefully hang it out of the way, making sure the brake line isn't stretched or damaged.
4. Remove the Rotor (if applicable): Depending on your Blazer's design, you might need to remove the rotor to access the bearing.
5. Disconnect Suspension Components (if necessary): This may involve disconnecting the ball joint, ABS sensor, and other components. Again, your repair manual is vital here.
6. Remove the Hub Assembly: This is where the bearing press becomes essential. You'll likely need to press the bearing out of the hub assembly.
7. Inspect the Axle: Check for any damage or wear on the axle.
8. Clean and Inspect the Hub: Thoroughly clean the hub assembly.
9. Pack the New Bearings with Grease: Pack the new bearings with the specified grease.
10. Press the New Bearings into the Hub: Carefully press the new bearings into the hub assembly using the bearing press.
11. Reassemble: Reinstall the hub assembly, rotor, brake caliper, and wheel. Tighten all bolts to the manufacturer's specifications using a torque wrench.
12. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
13. Torque Lug Nuts: Tighten the lug nuts to the correct torque specification.
14. Test Drive: After reassembly, test drive your Blazer at various speeds to ensure the repair was successful and that there are no vibrations or noises.
Warnings:
* Incorrect torque: Using the wrong torque values can damage parts or lead to failure, potentially causing a serious accident.
* Damaged parts: If any parts are damaged during the repair, replace them.
* Bearing damage: Using improper tools to remove or install the bearings can easily damage them.
* Improper installation: Incorrectly installed bearings can fail, leading to loss of control and potential accidents.
This is a complex repair. If you are not comfortable with any of these steps, please seek professional help from a qualified mechanic. Your safety is paramount. A mistake could lead to a dangerous situation.
