This response provides a *general overview* and should not be considered a complete guide. Failure to follow proper procedures could lead to damage or injury.
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 prevent the vehicle from rolling.
* Lug wrench: To remove the wheel.
* Impact wrench (highly recommended): Makes removing the wheel studs and axle nut much easier. A breaker bar and socket will work, but it's much more strenuous.
* Sockets and wrenches: Various sizes depending on your specific Blazer. Check your repair manual.
* Bearing packer: To properly pack the new bearings with grease.
* Penetrating oil (PB Blaster, etc.): To help loosen rusted or seized components.
* Hammer and punch: Possibly needed to help remove components.
* Torque wrench: Crucial for tightening bolts and nuts to the correct specifications. Improper torque can damage components.
* New wheel bearings: Make sure you get the correct part number for your vehicle.
* New axle seals (likely): These often need replacing when the bearings are replaced.
* Grease: Use the correct type of grease specified in your repair manual.
* Clean rags and shop towels: To keep things clean.
* Safety glasses and gloves: Protect yourself.
General Steps (Consult your repair manual for precise details):
1. Safety First: Secure the vehicle on level ground using jack stands. Engage the parking brake and use wheel chocks.
2. Remove the Wheel and Tire: Remove the lug nuts and take off the wheel.
3. Remove the Brake Caliper: Carefully remove the brake caliper and hang it securely out of the way using wire or a bungee cord. Do not let the brake line hang freely.
4. Remove the Rotor (disc brake): Remove the rotor. It might be held on by bolts or it could simply slide off after removing the caliper.
5. Disconnect the ABS Sensor (if applicable): Disconnect the ABS sensor wire if equipped.
6. Remove the Axle Nut: This will often require a significant amount of torque. Use an impact wrench if possible.
7. Remove the Hub Assembly: The hub assembly (containing the bearing) is usually held on by several bolts. These can be very stubborn, so use penetrating oil and allow it to soak.
8. Remove the Old Bearings: This step will vary depending on the specific design of your hub assembly. Some require pressing out the bearings, while others have bearings that are easily removed. Your repair manual will detail this process.
9. Clean and Inspect: Thoroughly clean the hub assembly and axle. Inspect for any damage.
10. Install New Seals: Replace the axle seals.
11. Pack the New Bearings with Grease: Use a bearing packer to ensure proper lubrication.
12. Install the New Bearings: Carefully install the new bearings into the hub assembly. This may require a press.
13. Reassemble the Hub Assembly: Reassemble the hub assembly, ensuring everything is correctly seated and aligned.
14. Tighten the Axle Nut: Torque the axle nut to the specifications in your repair manual.
15. Reinstall Everything: Reinstall the rotor, caliper, wheel, and lug nuts, tightening to the correct torque.
16. Test Drive: After completing the repair, test drive the vehicle to ensure everything functions correctly. Listen carefully for any unusual noises.
Important Considerations:
* Pressing Bearings: Pressing bearings correctly is crucial. Improper installation can easily damage the bearings. If you don't have access to a bearing press, take the hub assembly to a professional mechanic.
* Torque Specifications: Using the correct torque values is critical to prevent damage. Always consult your repair manual.
* Wheel Alignment: After a wheel bearing replacement, it's a good idea to get a wheel alignment performed to ensure proper handling and tire wear.
This is a simplified overview. Refer to a repair manual specific to your 1998 Chevy Blazer LS 4x4 for complete and accurate instructions. If you're not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. This is a job where errors can lead to significant damage or even injury.
