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89 M20B25 Rear Seal Gasket

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    89 M20B25 Rear Seal Gasket

    This is the gasket for the housing that holds the rear crank seal. It looks like it's aluminum or steel. Do I just put it in or does it need some kind of sealant both sides too? If so what should I use?

    Bentley says put some silicone down near the oil pan gasket but nothing about the rest of the gasket. I think this gasket was different when Bentley was written? I think it used to be a cork or paper kinda thing before.

    I don't want to do this twice.

    Thanks
    Attached Files

    #2
    As far as i've seen, the original one was paper. This new one will get crushed when tightened so no sealant is needed. Also, if your rear main seal is good/replaced, it shouldn't leak anyway. Make sure your surfaces are clean. just my 0.02, I could be wrong but thats what we did on my buddy's car.

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      #3
      i use that metal one w/o issue. i red RTV both sides and it works great.
      Much wow
      I hate 4 doors

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        #4
        Thanks guys!

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          #5
          I think the black coating acts as a sealer, but I chickened out and used a little motorcycle case sealer on both sides. I don't want to have to pull the trans to get in there again.

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            #6
            Just did one for my new beater and Myster-E did a light coat of silicone on both sides.
            BimmerHeads
            Classic BMW Specialists
            Santa Clarita, CA

            www.BimmerHeads.com

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              #7
              bumping an old thread here..

              I have a metal style RMS gasket. Should I follow the bentley torque figures or just tighten it until it feels good? The Bentley figures seem light for what appears to be a crush gasket


              it's a Kenny Powers quote on wheels

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                #8
                the bentley seem to be spec'd had they been 8.8 grade (still puts about 6 tonnnes of total preload). if they are 10.9 a little more is fine 13Nm M6 and 32Nm M8

                id use the non hardening gasket cement from loctite / permatex. Silicone is evil except in a nice set of fakies
                89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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                  #9
                  Originally posted by digger View Post
                  . Silicone is evil except in a nice set of fakies
                  I'm glad to see someone else who dreads the possibility of a loose piece of silicon clogging an oil gallery.
                  Deck Lid and soft top Shocks on hand

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                    #10
                    Originally posted by jeffnhiscars View Post
                    I'm glad to see someone else who dreads the possibility of a loose piece of silicon clogging an oil gallery.
                    x2. The only place where I'd use a silicone type sealer on this engine: very small amount around edges of rocker shaft rubber plugs and corners. And it better be the top shelf stuff - Hondabond or Yamabond, these sealants don't flake off.

                    Front/rear main seal gaskets get a coat of permatex high tack

                    https://441py33rout1ptjxn2lupv31-wpe...ngSelector.pdf
                    Last edited by zaq123; 03-04-2019, 08:42 AM.

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