1. Assessment & Planning:
* Identify the Stripped Bolt: Pinpoint exactly which bolt is stripped. Is it the axle nut, a hub retaining bolt, or something else? This dictates your approach. Often, it's the axle nut that gives trouble.
* Severity of Stripping: How badly is it stripped? Minor damage might be addressable with extraction techniques. Severe stripping may require more drastic measures.
* Tools: Gather specialized tools *before* you start. You'll need more than just basic wrenches. Expect to need:
* Penetrating Oil (PB Blaster, etc.): Soak the bolt liberally for many hours, even overnight.
* Impact Wrench (preferably air-powered): This provides the torque needed to break loose stubborn, damaged fasteners.
* Bolt Extractors: Various sizes depending on the bolt's size. These are sets of hardened steel drills and reverse-threaded screws to grip and remove broken bolts.
* Drill with appropriate drill bits: If extraction fails, you might need to drill the bolt out. Get bits slightly smaller than the bolt's diameter.
* Weld-on studs: If the bolt is completely gone, you might need to weld on a new stud to facilitate removal. This requires a welder and skill.
* Socket set, wrenches: Standard tools, but you'll need a variety of sizes.
* Jack and jack stands: Essential for safe working conditions.
* Wheel chocks: Prevent the vehicle from rolling.
* New wheel bearing assembly: Get the correct part for your vehicle.
* Torque wrench: Crucial for tightening the replacement bolts to the correct specification.
* Pry bar/hammer: May be needed to help break things loose.
2. Removal (Focusing on the Stripped Bolt):
* Penetrating Oil: This is your first and best weapon. Generously apply and let it soak in for as long as possible. Re-apply frequently.
* Impact Wrench: Try the impact wrench first. Use the correct socket size and apply bursts of power, not continuous pressure.
* Bolt Extractors: If the impact wrench fails, carefully drill a pilot hole into the center of the stripped bolt. Then use a bolt extractor, following the manufacturer's instructions. This often requires patience and persistence.
* Drilling Out (Last Resort): If the extractor doesn't work, you might need to drill the bolt out completely. This is risky because you can damage the surrounding metal. Be extremely careful and go slowly.
* Welding a Stud (Last Resort): If the bolt is completely gone, welding a stud onto the remaining bolt stub is the best way to remove it. This requires welding skills and the proper equipment.
3. Wheel Bearing Replacement (After Bolt Removal):
Once the stripped bolt is removed, the rest of the wheel bearing replacement follows standard procedures, and may vary slightly depending on which specific bolt was stripped. Generally it involves:
* Removing the caliper and rotor: Support the caliper with wire or a hanger to avoid damaging the brake line.
* Removing the axle nut (if not the stripped bolt): Use an impact wrench if necessary.
* Removing the hub assembly: This often involves pulling it off the axle. A puller tool can help.
* Installing the new bearing assembly: Make sure it's seated properly.
* Reassembly: Follow the disassembly steps in reverse order. Use a torque wrench to tighten everything to the manufacturer's specifications.
4. Professional Help:
If you're uncomfortable with any of these steps, especially the bolt extraction and welding, take your car to a qualified mechanic. Attempting these repairs incorrectly could lead to further damage, potentially requiring more extensive and costly repairs. A stripped bolt is a serious issue that could easily cause more harm than good if not handled correctly.
Important Note: Consult a repair manual specific to your 1999 Ford Taurus wagon. It will provide detailed diagrams and torque specifications essential for safe and successful repair. Failing to use the correct torque can damage components and compromise safety.
