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Leaking diff... from the input/pinion seal?

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    #1

    Leaking diff... from the input/pinion seal?

    It seems I have a rare problem as I cannot locate any information on this. My pinion/input bearing seal appears to be leaking. It drips in my garage and definitely there is some spray while driving. I cannot find any information on this and it seems to be a rare failure.

    At first I thought like my Jeep if you overfill it will go out a weep hole on the front. Apparently the BMW does not have this feature? It was a little overfilled as I filled outside the car and then installed. Well it leaked out. Now is slightly below the full level. Stopped driving it for now...

    I want to fix it though. Does the whole diff need to be taken apart? IE pull everything and then redo everything post installation of that seal? Any ideas/comments would be great...

    To this date I have actually never witnessed this leak on a BMW... ever. Lucky me huh?
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    #2
    it would be best to pull the diff, replace all seals at once..
    This way you can inspect the diff and check out the inside of it at the same time.

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      #3
      Originally posted by White325is View Post
      it would be best to pull the diff, replace all seals at once..
      This way you can inspect the diff and check out the inside of it at the same time.

      Agreed... my question is what is the process? The Jeep process is to pull ALL the guts and it has to be setup properly... not something for the basic mechanic.

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        #4
        ahh, yeah. You will need to pull the whole setup out of the diff Im pretty sure.
        Search for a thread made by peerless on e30tech. Im pretty sure he did this a few months ago and took photos.

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          #5
          Pretty sure it is just photos... front seal was not touched :(

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            #6
            First you have to remove the lock plate around the large nut on the input shaft. Then remove nut on the flange, and this takes a lot of torque, something like 200 or 300ft.lbs. iirc. Check the Bentley for the exact number. Once the nut is off you can pull the shaft out and replace the seal. Be sure to make marks the nut and the housing because but you don't torque it down with a torque wrench. You torque until the marks line up. Then install a new lock plate. The only difficult part is holding the flange while you tighten/loosen the large nut.

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