Mercury C3AZ-4635-J Universal Joints

Wear in the needle roller bearings is characterised by vibration in drive-line, clunks' on taking up the drive, and in extreme cases of lack of lubrication, metallic squeaking, and ultimately grating and shrieking. It is easy to check if the needle roller bearings are worn with the driveshaft in position, by trying to turn the shaft with one hand, the other hand holding the rear axle pinion flange when the rear universal joint is being checked, and the front half coupling when the front universal is being checked, Any movement between the driveshaft and the front and rear half couplings is indicative of considerable wear. If worn, the old bearings and spiders will have to be discarded and repair kit, comprising new universal joint spiders, bearings, oil seals,and retainers purchased. Check also by trying to lift the shaft and noticing any movement in the joints. Examine the driveshaft splines for wear. If worn it will be necessary to purchase a new front half coupling, or if the yokes are badly worn, an exchange driveshaft. It is not possible to fit oversized bearings and journals to the trunnion bearing holes.