Reinstalling a popped-out CV joint, specifically the inner joint back into the transmission or differential, typically involves correctly aligning the splines and applying firm, controlled force to seat it past the retaining clip.
Steps for Reinstalling a Popped-Out CV Joint
Successfully reinserting a CV joint requires careful alignment and proper technique to ensure it seats correctly and locks into place.
1. Preparation and Inspection
Before attempting to reinsert the joint, ensure the area is clean. Inspect the splines on both the CV axle shaft and inside the transmission or differential bore for damage. Check the condition of the retaining clip on the end of the CV joint stub shaft; it should be present and functional. A damaged or missing clip will prevent the joint from seating properly.
2. Positioning the Axle
Position the vehicle appropriately (often with the suspension extended to allow the axle to reach the bore) and orient the CV axle so the inner joint end is aligned with the transmission/differential bore. It's crucial to get the angle right so the splines can engage.
- Aligning the Shaft: One technique to help manipulate the axle shaft and joint into position involves rotating the brake rotor. As seen in a demonstration, rotating the brake rotor can help align the axle shaft end, guiding it back towards or within the general area on the inside of the boot, even if the boot itself is broken. This movement helps orient the axle for insertion.
3. Reinserting the Joint
With the splines aligned, the joint needs to be pushed firmly into the transmission or differential. The goal is to compress and overcome the internal retaining clip inside the transmission/differential bore.
- Applying Force: Apply a sharp, firm push directly along the axis of the axle shaft towards the transmission/differential. Sometimes, a soft-faced mallet can be used to tap gently on the outer edge of the joint housing or the axle nut threads (with the nut partially threaded on for protection) to help persuade it into place. Avoid hitting the axle shaft itself, which could damage it. You should feel or hear a distinct "pop" or click as the retaining clip compresses and then expands into its groove, locking the joint in place.
4. Verification
Once you believe the joint is seated, give the inner joint housing a firm pull outward. If it is properly seated past the retaining clip, it should resist pulling out. If it pulls out easily, it was not seated correctly, and you must repeat the insertion process.
Why CV Joints Pop Out
CV joints typically pop out due to excessive suspension droop (like when a vehicle is lifted without support on the lower control arm), impacts, or failure of the internal retaining clip or the circlip on the axle shaft itself.
| Potential Causes for Popping Out | Action |
|---|---|
| Excessive Suspension Droop | Support suspension during work |
| Impact Damage | Inspect axle and transmission/diff bore |
| Failed Retaining Clip | Replace clip or axle (if clip is integral) |
Proper installation and verification are key to preventing the CV joint from coming out again during vehicle operation.
