When replacing a CV joint boot, utilize a complete CV joint boot repair kit that includes a new boot, clamping bands, special lubricant, and a new inner CV joint circlip, available from an authorized BMW dealer parts department. The outer CV joint cannot be removed from the axle shaft, so it is necessary to first remove the inner joint and boot to replace the outer CV boot. If the CV joints are worn or defective, a complete rebuilt axle shaft can be obtained from an authorized BMW dealer parts department. Begin by removing the axle shaft, then, while working with the axle shaft on a bench, cut off the old boot clamps and remove the boot, cleaning off old grease from the joint and shaft. Remove the dust cover from the CV joint and take off the circlip retaining the joint inner hub to the axle shaft, then press off the joint cap. Support the inner hub with a special tool and press the axle shaft out of the joint using another special tool, ensuring all old lubricant is cleaned off the shaft splines and inner joint splines. If disassembly of the CV joint is necessary for cleaning and inspection, matchmark the inner and outer race and intermediate ball cage to allow for proper reassembly. To inspect the CV joint, clean away the grease and check for galling, pitting, and other signs of wear or damage, noting that polished surfaces or visible ball tracks alone do not necessarily warrant replacement, while discoloration from overheating indicates a lack of lubrication and the need for a new CV joint. Slide the CV joint boot onto the axle shaft and apply a heavy-duty locking compound to the drive axle splines, positioning the new CV joint on the shaft with the raised side of the hub facing the shaft. Avoid letting the locking compound contact the balls in the joint, applying only a thin coat to cover the splines. While supporting the axle shaft with a special tool, press the inner hub of the CV joint onto the shaft and install a new circlip, followed by new boot clamps. Use sealing gel to secure the dust cover to the CV joint before reinstallation, taking care not to let the ball hub pivot too far in the outer ring of the joint to prevent the balls from falling out. Before installing each small boot clamp, ensure to "burp" the boot by flexing the CV joint, using a small screwdriver inserted between the boot and the axle shaft to assist in the process.
Posted by BMWPartsDeal Specialist 
