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Rear Transmission Output Seal !UPDATE!

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    Rear Transmission Output Seal !UPDATE!

    So, after countless hours of searching and reading this opinion vs this opinion, I have given up searching and decided to ask myself once and for all.


    I am doing a 5-speed swap and just replaced my rear output seal because the rear of my transmission looked horribly dirty, so I wanted to do it as a preventative measure. The new seal sticks out about about 1-2mm more than the last one did, but I cannot, for the life of me get it in anymore than I already have. It is not touching the output flange, it just kinda... sticks out. It also took a tremendous about of force to get it in; I think I was hammering away with a rubber mallet for 10 minutes before finally getting it to seat right. The seal itself looks different from the seal I just removed.

    I have read that seals produced after a certain model year have an extra "O-ring" connected to it so that you dont need to put sealant on the seal. Comparing the two seals, one has a rubber ring around it (the fresh one I just installed) and one does not, which is the old one. Would it be okay to run it this way (sticking out 1mm)? Would I need to put sealer on it or would I be safe running it straight in as such?


    Secondly, I've read people putting gasket sealer to prevent leaks from the output flange splines and 30mm lock bolt threads. I personally think this is overkill as when I removed the nut on 3 other transmissions, there was no Loctite or sealer on the splines. There are a handful of people that would agree, but still enough people quoting the Bentley manual and are pro sealer

    Is it necessary to run all this Loctite and sealer..??
    Last edited by JinormusJ; 08-07-2013, 08:45 PM.

    #2
    Whether or not necessary...is that a job you want to do again?

    I just replaced all my seals and input shaft bearing. I pull gasket seal and thread lock (blue) on all the recommended places.

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      #3
      I'm just asking

      I've read support for both arguments, and I've read things about certain rear output shaft seals not needing sealant. I was simply asking to get more information about some of the rumors/speculation/sources I've been reading to see if it was common knowledge and people aren't just BSing

      I've also read about people doing it CORRECTLY with everything and they had to go through 3 seals before it stopped leaking. I'm just trying to get the most information on this because ice read a lot more horror stories than good news when it comes to these seals
      Last edited by JinormusJ; 07-28-2013, 09:08 PM.

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        #4
        The TIS (and the Bentley) call for thread sealant. As to the seal, it sounds like you don't have the right part.
        The car makes it possible, but the driver makes it happen.
        Jim Levie, Huntsville, AL

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          #5
          Well noted

          Looks like I'll just pass by BMW and pick up the correct parts and sealant from the dealer
          Thanks J

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            #6
            So finished my 5-speed swap and my rear output seal is leaking like a mother. I have read up on a few things and have determined that the aftermarket Elring brand rear seal is the culprit.
            I have heard nothing but bad news from this company on this particular seal, and wish I had researched this better as it would have saved me a lot of headache.


            At this point, I think I will just be going to the dealer for the seal, or contacting Blunt or Patrick to see if they can get an OEM seal for me
            Last edited by JinormusJ; 08-07-2013, 09:16 PM.

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