Here's a general overview of the process:
1. Preparation:
* Safety First: Disconnect the negative battery terminal to prevent electrical shorts. Use jack stands to securely support the vehicle after lifting it with a jack. Never work under a car supported only by a jack. Wear safety glasses and gloves.
* Gather Tools: You'll need a jack, jack stands, wheel chocks, socket set (metric), wrenches, a ball joint separator (pickle fork or ball joint press is recommended, a hammer can damage components), a hammer, a pry bar, possibly a CV joint boot clamp pliers, grease, and possibly a torque wrench. Consult your repair manual for specific socket sizes.
* Repair Manual: Obtain a Honda repair manual specific to your 1999 Civic Si. This is *essential* for torque specifications and detailed diagrams.
2. Axle Removal:
* Raise and Secure: Safely lift the vehicle and secure it on jack stands.
* Remove Wheel: Remove the wheel from the right front side.
* Disconnect ABS Sensor (if applicable): Carefully disconnect the ABS sensor wire from the axle.
* Disconnect Brake Caliper: Unbolt and secure the brake caliper out of the way, possibly using a bungee cord or wire to keep it from hanging by the brake line.
* Disconnect Tie Rod End: Use a tie rod end separator to separate the tie rod end from the steering knuckle.
* Remove Outer CV Joint: This is often the most difficult part. You'll likely need a ball joint separator to separate the outer CV joint from the steering knuckle. Be careful not to damage the CV boot.
* Remove Axle Shaft: Once the outer CV joint is disconnected, the axle shaft should slide out of the wheel hub. You may need to gently tap it out with a hammer.
* Remove Inner CV Joint (from transmission): This usually requires separating the inner CV joint from the transmission. This step may involve removing the transmission mount to access the inner CV joint. Consult your repair manual.
3. Axle Installation:
* Install New Axle: This is generally the reverse of the removal process.
* Install Inner CV Joint: Carefully install the inner CV joint back into the transmission.
* Install Outer CV Joint: Carefully align the outer CV joint and the steering knuckle. Ensure it's seated properly.
* Reconnect Tie Rod End: Connect the tie rod end to the steering knuckle.
* Reconnect Brake Caliper: Reattach the brake caliper and ensure it's properly secured.
* Reconnect ABS Sensor (if applicable): Reconnect the ABS sensor wire.
* Install Wheel: Reinstall the wheel and tighten the lug nuts.
* Lower Vehicle: Carefully lower the vehicle.
* Torque Specifications: Crucially, use a torque wrench to tighten all bolts to the specifications listed in your repair manual. Incorrect torque can lead to failure and potential accidents.
4. Final Steps:
* Lower Vehicle: Carefully lower the vehicle to the ground.
* Torque Wheel Lug Nuts: Tighten the wheel lug nuts to the correct specification.
* Test Drive: After everything is reassembled, take a short test drive to check for any unusual noises or vibrations.
Disclaimer: This is a simplified overview. Incorrect installation can result in serious injury or damage. Refer to a Honda service manual for your specific 1999 Civic Si model for detailed, step-by-step instructions and torque specifications. If you are not comfortable performing this repair, consult a qualified mechanic.
