Title: Driveshaft Center Bearing Replacement
Owner: Don B , added Mar 03 2013 04:08:13
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2400x1363 213kb(If the image has failed to load, click on it to view large version) Description: The driveshaft center bearing supports a U-joint about midway between the transmission and differential and reduces noise transmitted into the passenger compartment. Over time, the bearing deteriorates and distorts, as can be seen in this comparison of old (left) and new bearings.
2800x1607 217kb(If the image has failed to load, click on it to view large version) Description: The bearing mounts on a multi-part bracket with two screws. The bearing position is critical for minimal vibration, so before you remove the screws, scribe or paint around the washers on the mounting bracket and anti-twist bracket. Here I moved the anti-twist bracket to show the scribe marks.
3400x2367 220kb(If the image has failed to load, click on it to view large version) Description: Each end of the main mounting bracket attaches to the body with two screws. Scribe around the screws and the ends of the bracket to ensure proper location on reinstallation. Remove all four screws and lower the bracket to rest on the exhaust to clear the center bearing as you pull the shaft out.
2950x865 231kb(If the image has failed to load, click on it to view large version) Description: Refer to my photo album on Jurid Flexible Coupling Replacement to disconnect the Jurid from the differential. Then carefully pull the rear driveshaft section rearward & downward till it separates from the front shaft. The rear shaft on your model year may look very different from this one.
3471x2074 209kb(If the image has failed to load, click on it to view large version) Description: The driveshaft is factory-balanced as a complete assembly, with weight plates welded to both sections (arrows). Before removing the rear section, paint alignment marks on both sections so you can return them to the correct radial orientation to avoid precession and vibration.
3202x1746 219kb(If the image has failed to load, click on it to view large version) Description: Our ’93 has arrows stamped into the U-joint and main shaft to aid in orienting the two shaft sections. I enhanced the arrows with a paint pen so I could better see them in the dim light above the exhaust pipes. I made additional alignment marks on the shaft and other end of the U-joint.
3000x1811 204kb(If the image has failed to load, click on it to view large version) Description: On ’93 models, the U-joint is attached to the driveshaft with one screw, which is secured by a tab washer. Bend the tab ear down with a drift punch and remove the screw.
3500x1914 218kb(If the image has failed to load, click on it to view large version) Description: The U-joint was stuck so I applied penetrant and worked on other things for a while. Then I rapped the joint with a mallet and pulled it off the splined shaft. On a ’93, the center bearing just slips off, but on other years it is reportedly press fit and may require a hydraulic press for removal.
3504x2244 192kb(If the image has failed to load, click on it to view large version) Description: These bearing collars (arrows) are press fit onto the shafts, and since they were in good shape and identical to the ones that came with the new bearing, I just cleaned them and left them in place.
3451x2586 198kb(If the image has failed to load, click on it to view large version) Description: I put copper grease on the slip-splines and the bearing seat of the shaft. I tapped the bearing onto the shaft with a socket that fit the inner collar, then used a drift punch to tap around the collar until the bearing was fully seated.
3006x5110 235kb(If the image has failed to load, click on it to view large version) Description: A nice feature of the ’93 model year is that the driveshaft and U-joint each have one double-width spline that prevents the parts from being assembled in the wrong radial orientation. One less thing to worry about.
3280x898 218kb(If the image has failed to load, click on it to view large version) Description: Even if you follow your scribe marks on the brackets, the bearing position may still need to be tweaked to eliminate vibration. Sighting forward along the driveshaft from the rear, the center bearing should be positioned “a little left of center,” in the helpful words of the Jaguar Service Manual.
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