Mercury 4L3Z-4635-A U-Joint Repair Kit

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To replace single-cardan U-joints, make sure you have a press or vise and a universal joint service kit. First, take off the driveshaft and use pliers to remove snap-rings from the spider. Then place the driveshaft on a workbench with a vise. Sockets should be used to press bearing caps out of the yoke. Fill new universal joint bearings with grease, and position the spider and caps before pressing them into place; do not forget snap-rings. Dust seals must not be damaged. Add grease and mount the driveshaft. Cardan U-joints should have rings removed and positions marked. Remove bearing caps in the center yoke and driveshaft yoke. Replace the centering ball and dust cover on the companion flange. Disassemble the center yoke and driveshaft yoke, and install new spider bearing in the driveshaft yoke. Insert new caps and seals with grease fitting facing away from the center yoke.

The driveshaft sends engine power to the rear axle through the transmission. At either end of a driveshaft universal joints are used. Although many U-joints are single-cardan type, some 4WD models have double-cardan U-joints. A slip yoke is located at the front of a rear driveshaft, and it connects to a differential by means of a flange yoke. Front driveshafts on 4WD have a slip yoke on each end. The only time a driveshaft may need attention is when the universal joints wear out and need replacing as they are serviceable items which require little maintenance otherwise. Additionally, the driveshaft should be inspected for damage during service procedure and cleaned of any debris that might be present in order for it to function properly again as well.

If equipped with a grease fitting, you should install the grease fitting and fill the joint with grease, but be careful not to overfill the joint as this could blow out the grease seals.

4L3Z4635B IS WHAT WE SHOW PER VIN, ILLUSTRATION SHOWS CLIP TYPE