drivetrain
CV Boot - Outer
for 2021 Toyota RAV4 2.5L I4 · AWD
Difficulty
Moderate
Time
1.6 h
Tools
13
Steps
16
Replace the outer CV boot on the front axle shaft to prevent grease loss and contamination of the CV joint.
Warnings
⚠️Vehicle must be securely supported on jack stands before working underneath - never rely on floor jack alone
⚠The axle nut is torqued to 250 Nm and requires significant force to remove - loosen while vehicle is on ground with wheels chocked
⚠Inspect the CV joint for damage while boot is removed - if joint shows wear, pitting, or excessive play, replace the entire axle shaft
ℹ️Work in a clean environment to prevent contamination of CV joint during boot replacement
Tools required
Floor jack and jack standsEssential
Torque wrench (50-300 Nm range)Essential
19mm socket for lug nutsEssential
30mm or 32mm axle nut socketEssential
Breaker barEssential
CV boot clamp pliers or boot clamp toolEssential
Pry bar or large flathead screwdriver
Hammer
Wire cutters or side cuttersEssential
Snap ring pliersEssential
Clean ragsEssential
Parts cleaning brush
Brake cleaner or degreaserEssential
Parts
- Outer CV boot kit with clamps and grease × 1 — Use OEM specification or quality aftermarket
- Axle nut × 1 — 90179-36031 or equivalent - use new
- Cotter pin (if applicable to nut style) × 1 — Check specific model year nut type
Preparation
- Park vehicle on level ground and engage parking brake
- Chock rear wheels securely
- Loosen front wheel lug nuts 1/2 turn while vehicle is on ground
- Loosen (but do not remove) the front axle nut while vehicle is on ground - this requires significant force
- Raise front of vehicle and support securely on jack stands at manufacturer lift points
- Remove front wheel on side being serviced
Procedure
- 1Remove axle nut and free axle from hubRemove the previously loosened front axle nut completely and set aside (this will not be reused). If nut has cotter pin, remove and discard. Note the position of any washers. The axle shaft should now be free to push inward from the hub - you may need to tap it gently with a plastic mallet.
- 2Support axle shaftPush the axle shaft inward slightly to disengage splines from wheel hub. Support the outer end of the axle shaft with a wire or bungee cord to prevent it from hanging and damaging the inner CV boot or joint. Do not allow the axle to hang freely.
- 3Remove old boot clampsLocate the two clamps securing the outer CV boot (one small clamp near the shaft, one large clamp near the CV joint housing). Use wire cutters or side cutters to cut and remove both clamps. Remove and discard the clamps.
- 4Slide boot away from CV jointSlide the damaged outer CV boot toward the center of the axle shaft to expose the CV joint. Wipe away excess grease with clean rags to expose the joint mechanism and snap ring.
- 5Remove CV joint from shaftLocate the snap ring or circlip that retains the outer CV joint to the axle shaft. Use snap ring pliers to compress and remove the snap ring. With snap ring removed, pull the CV joint housing straight off the axle shaft - it may require some force or light tapping. Mark the orientation if the joint has an indexed position.
- 6Remove old boot and clean shaftSlide the old CV boot completely off the axle shaft. Thoroughly clean the axle shaft surface where the new boot will sit using brake cleaner and clean rags. Inspect the shaft for any damage, scoring, or rust that could tear the new boot.
- 7Clean and inspect CV jointClean all old grease from the CV joint housing and internal components using brake cleaner and a parts brush. Inspect the joint carefully for any signs of wear, pitting, scoring, or loose ball bearings. Rotate the joint through its full range of motion to check for roughness or binding. If any damage is found, replace the entire axle shaft rather than just the boot.⚠A damaged CV joint cannot be repaired - if wear is present, the entire axle shaft must be replaced
- 8Install new boot onto shaftSlide the new outer CV boot onto the axle shaft from the outer end, positioning it in the correct location according to the boot kit instructions. Ensure the boot is not twisted. Install the small clamp onto the boot but do not tighten yet.
- 9Repack CV joint with greasePack the CV joint with the fresh grease provided in the boot kit. Work grease into all ball bearing tracks and ensure the joint is completely filled. Use all the grease provided in the kit - typically the joint gets about 60% and the boot gets about 40% of the total grease.
- 10Reinstall CV joint to shaftAlign the CV joint with the axle shaft splines and slide it onto the shaft until it is fully seated. Reinstall the snap ring or circlip to secure the CV joint to the shaft, ensuring the snap ring is fully seated in its groove.
- 11Position and secure bootSlide the boot over the CV joint housing and ensure it is properly seated in both grooves (shaft groove and joint housing groove). The boot should not be twisted or stretched. Add the remaining grease from the kit into the boot. Install the large clamp onto the boot at the CV joint housing end.
- 12Tighten boot clampsUsing CV boot clamp pliers or the appropriate tool for your clamp type, tighten both the small and large clamps securely. Ensure clamps are positioned correctly in the boot grooves and are tight enough to prevent grease leakage but not so tight as to cut the boot material. Bend or crimp the clamp tabs as required by the clamp design.
- 13Reinstall axle into wheel hubGuide the outer end of the axle shaft back into the wheel hub, aligning the splines. Push the axle through the hub until the shaft is fully seated and extends through to accept the axle nut. You may need to rotate the shaft slightly to align splines.
- 14Install new axle nutInstall the new axle nut onto the axle shaft threads. Thread it on by hand as far as possible. Do not fully torque yet - this will be done with the vehicle back on the ground.
- 15Reinstall wheel and lower vehicleReinstall the wheel and thread lug nuts on by hand. Lower the vehicle until the tire just touches the ground but the suspension is not fully loaded. Torque the lug nuts to specification in a star pattern. Fully lower the vehicle and remove jack stands.Torque specWheel Lug Nuts140 Nm (103 lb-ft)
- 16Torque axle nutWith the vehicle on the ground and parking brake engaged, torque the new axle nut to specification. If the nut design uses a cotter pin, install a new cotter pin through the hole and bend the ends. If the nut design requires staking, use a punch to stake the nut collar into the axle shaft groove.⚠Never reuse the old axle nut - always install a new oneTorque specAxle Nut250 Nm (184 lb-ft)
Reassembly
- Ensure CV boot clamps are properly secured and positioned in boot grooves
- Verify axle nut is properly torqued and secured with new cotter pin or staked as applicable
- Confirm wheel lug nuts are torqued to specification in star pattern
Verification
- Inspect the new CV boot for proper seating and no twisting or stretching
- Check that boot clamps are tight and secure with no gaps
- Verify no grease is leaking from either end of the boot
- Rotate the wheel hub and turn the steering wheel lock-to-lock to ensure full CV joint range of motion without binding
- Test drive vehicle and listen for any clicking or popping noises from the CV joint during turns
- Re-check axle nut torque after first 50 miles of driving