Posted by AndyS on September 03, 2012 at 15:33:59 from (71.169.168.112):
In Reply to: mf35 rear wheel seal posted by garvas on September 03, 2012 at 13:39:37:
The inner seal is pretty easy to get to. The brake drum retaining screws can be hard to get off because just a slotted head. The inner seal is what keeps the oil from getting through. If it fails it will allow the transmission oil to wash through the bearing grease and on to the brakes. You may get away with just replacing the inner seal. However, the sure thing is to replace both seals and you might as well do the bearings while you are there. The outer seal really just keeps the bearing grease from leaking on to the brakes. The outer seals however can be a real pain because it requires removing the axle collar and bearings. The axle collar needs to be drilled and chiseled off. Then the bearings need to be pulled off the shaft. I went to heavy truck garage and it took them 3 hours with a large shop press and a torch to get the bearings off. (bearings destroyed in process) The outer seal was then easy to remove and replace. Replacing the bearing requires heating it in oil to get it to slip on. The axle collar needs to be red hot to slip (or pound) it on. It is important that the bearing and collar are properly seated because the axle end plate should be kept between .002" and .008". You will need to have an assortment of shims on hand and a good dial indicator to measure the end play. I would not call it an easy project, but if you have oil leaking on the brakes then you really should do both seals and the bearings.
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