Pontiac 554631 Seal,Rear Wheel Bearing

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These cars utilize two types of drive axles, namely the C-lock and the non C-lock type whereby the difference depends on the structure of the locking system. In the C-lock type the shafts are locked by C-shaped locks that fit into slots at the inner end of the shaft while in the non C-lock type they are locked by a backing bracket plate fixed on the axle housing. The bearings used in the case of the C-lock axle comprise an outer race, bearing rollers, and roller bearing cage with snaprings while the bearings used in the case of the non C-lock axle is a unit roller bearing which is pressed on the shaft up to the shoulder. Pre-service, it is necessary to determine the axle type and the axle identification number is located on the front side of the passenger side axle tube adjacent to the differential carrier, but not for models which used 8½ in. ring gear, which have the ID on a tag under one of the differential rear cover bolts. For the non C-lock type the process starts by removing the bearing retainer plate by pounding it using chisel and the axle shaft end play check that should not be more than 0.022 in. (5mm). The removal procedures involve the detachment of the wheel, tire, and brake drum as well as the separation of the brake line, the use of the slide hammer to pull out the axle shaft and bearing assembly. The bearing retainer is then machined in several places so that it can be removed; the new bearing is then fitted and all the parts put back. For the C-lock type: The procedure is initiated by loosening and thereafter unscrewing the lockbolt and rod upon the differential; by withdrawal of the differential cover and by the unscrewing of the pinion shaft lockscrew. The axle shaft is pushed towards the center of the vehicle in order to get rid of the C-lock, always being careful not to scrap the oil seal during the extraction process. During installation, a bearing puller is applied, the new bearing is lubricated, and correct positioning of the axle shaft and C-lock must be reached in reassembling the differential and then the axle is filled with lubricant. Last of all, brake drum and wheels are reinstated and a check is made for the leaks with the help of road test.

On models equipped with a Borg-Warner rear axle assembly, servicing should be restricted to regular maintenance since working on the differential assembly, axles, bearings and seals in the axle assembly call for professional tools and the attention of a qualified mechanic. To find out whether your car has Borg-Warner rear axle, cast numbers must be matched with axle codes presented in the following table. First, it is recommended to take off the axleshaft, then utilise a large screwdriver, or a part of the inner end of the axleshaft to prise out the old oil seal from the end of the axle housing. After that, apply high melting point grease on the oil seal recess and hit the seal with a hammer so that the lips of the seal are turned inward and it's possible to see the metal face from the end of the axle housing; when fitted properly, the face of the oil seal should sit flush with the end of the axle housing. Last but not the least, go for the fitment of the axleshaft.

After removing the old oil seal, high melting point grease should be applied to the oil seal recess.

After removing the old oil seal, high melting point grease should be applied to the oil seal recess.

The face of the oil seal should be flush with the end of the axle casing when correctly installed.