Q: How to replace CV Boot on BMW Z4?
A: Remove the CV Boot and clean it before carefully mounting it in a vise. Some models feature a telescopic CV Boot with an inner CV joint mounted on a short shaft that slides into the main body; release the inner joint boot retaining clips and slide the boot away from the joint. Make alignment marks between the CV joint shaft and the CV Boot tube, then slide the CV joint and shaft from the CV Boot. Release the outer joint boot retaining clips and slide both boots from the inner end of the shaft. For other CV Boots, release the inner joint boot retaining clips to free the boot and dust cover, then lever off the sealing cover from the inner constant velocity joint. Scoop out excess grease and remove the inner joint circlip, supporting the inner member while tapping the CV Boot out of position. If the joint is tight, a puller may be needed. With the joint removed, slide the inner boot and dust cover off the CV Boot, then release the outer joint boot retaining clips and remove the boot. Clean the constant velocity joints with a suitable solvent and dry thoroughly, inspecting for cracks, flat spots, or surface pitting on the balls and checking the ball tracks for wear. If any components are worn or damaged, they must be replaced, and new boot repair kits should be obtained. For telescopic CV Boots, slide new boots over the inner end, repack both CV joints with grease, and apply grease to the splines of the inner CV joint shaft. Align the marks and insert the CV joint shaft, ensuring the correct distance from the end of the CV Boot. Ease the boots over the joints, ensuring proper location, and secure the inner joint boot clips. Position the outer joint boot clips 180° offset from the inner clips. For other CV Boots, tape over the splines, slide the new outer boot onto the CV Boot, and pack the outer joint with grease. Ensure the boot lips are correctly located, install the large metal retaining clip, and engage the new inner boot with its dust cover. Remove the tape from the splines, install the inner constant velocity joint, and secure it with a new circlip. Work grease into the inner joint and fill the boot with any excess, then slide the inner boot into position, aligning the dust cover, and secure it with retaining clips. Finally, apply a small amount of suitable sealant and press the new sealing cover onto the end of the inner joint, ensuring both constant velocity joints move easily before installing the CV Boot.