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    Manual Tranmission Mounting Point Rust

    Hi everyone, i've found that i've got some sizeable rust rot on the passenger side mounting point for the transmission. It's number 2 in this photo. It's where the bolt goes through the tranny mounts into the "frame" of the car - Any suggestions on getting this repaired? Simple cut and weld?
    You can see further back the mounting points for the auto transmission (the slit with the notch about 2/3rds the way down). For the manual point under number 2, it's basically rusted out so that the bolt can move around, causing a fair bit of vibration.
    Any help appreciated!!
    1988 Atlantisblau Euro/Japanese 325i Cabriolet
    1989 Schwartz 325i - now M50 powered! - now very dead
    1998 Toyota 4Runner Limited
    My 17,000km Big NA National Parks trip!

    #2
    Bump?
    Anyone know if that bit of the unibody is just one sheet of metal and its gauge?
    1988 Atlantisblau Euro/Japanese 325i Cabriolet
    1989 Schwartz 325i - now M50 powered! - now very dead
    1998 Toyota 4Runner Limited
    My 17,000km Big NA National Parks trip!

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      #3
      The PO of my car cut and welded it with no problems at all.


      Sent from my iPhone using Tapatalk
      The best one-stop shopping for German car parts and lifestyle: http://www.gutenparts.com/

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        #4
        Originally posted by berlow94 View Post
        The PO of my car cut and welded it with no problems at all.


        Sent from my iPhone using Tapatalk
        Cool cool, so it's just one layer of steel not some weird laminated business?
        Thanks, that's all i needed to know!
        1988 Atlantisblau Euro/Japanese 325i Cabriolet
        1989 Schwartz 325i - now M50 powered! - now very dead
        1998 Toyota 4Runner Limited
        My 17,000km Big NA National Parks trip!

        Comment


          #5
          Bumping this again,
          I got a quote from a shop that suggested getting rid of all the existing rust and sealing it off, then putting a bolt through the floor.
          How does this compare in ease of doing compared to cutting and welding in a new plate like @berlow94 said 2 posts above?
          1988 Atlantisblau Euro/Japanese 325i Cabriolet
          1989 Schwartz 325i - now M50 powered! - now very dead
          1998 Toyota 4Runner Limited
          My 17,000km Big NA National Parks trip!

          Comment


            #6
            I feel it would be easier to make a bracket to extend over to the fresh section of track like where the auto bolts in or possibly further down the manual one if it's. Not too rusty.
            Shawn @ Bimmerbuddies
            Bimmerbuddies LLC
            717-388-1256
            2971a Roundtop Rd, Middletown PA 17057
            bimmerbuddiesllc@gmail.com

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              #7
              ^What he said. With my 6 speed swap, I had to make a trans brace that extends forward to reach the slots for the bolts. There is a lot of room there. I'd just weld a bracket on the trans mount that extends forward or backward (or both) to clean metal. You'll also want to cut out all of the rust and seal it all up so it doesn't spread.

              Obviously the proper way to do it would be to replace the rusty metal, but it's a bit more involved to do it properly so it's structurally sound to hold the trans.
              85 325e m60b44 6 speed / 89 535i
              e30 restoration and V8 swap
              24 Hours of Lemons e30 build

              Comment


                #8
                Originally posted by SmokeE30 View Post
                I feel it would be easier to make a bracket to extend over to the fresh section of track like where the auto bolts in or possibly further down the manual one if it's. Not too rusty.
                Originally posted by JGood View Post
                ^What he said. With my 6 speed swap, I had to make a trans brace that extends forward to reach the slots for the bolts. There is a lot of room there. I'd just weld a bracket on the trans mount that extends forward or backward (or both) to clean metal. You'll also want to cut out all of the rust and seal it all up so it doesn't spread.

                Obviously the proper way to do it would be to replace the rusty metal, but it's a bit more involved to do it properly so it's structurally sound to hold the trans.
                You mean bolting the rusty side to the auto mounting point my welding something at a right angle to my existing brace? At that point wouldn't it make more of an open "S" shape, making it want to bend down on the right side where it would have bolted into the manual point originally?
                1988 Atlantisblau Euro/Japanese 325i Cabriolet
                1989 Schwartz 325i - now M50 powered! - now very dead
                1998 Toyota 4Runner Limited
                My 17,000km Big NA National Parks trip!

                Comment


                  #9
                  No, the slot for the mounting bolt is about 6" long. Is the whole thing rusted out? If not, and there is still a usable section, you can extend the brace to that area.
                  85 325e m60b44 6 speed / 89 535i
                  e30 restoration and V8 swap
                  24 Hours of Lemons e30 build

                  Comment


                    #10
                    Originally posted by JGood View Post
                    No, the slot for the mounting bolt is about 6" long. Is the whole thing rusted out? If not, and there is still a usable section, you can extend the brace to that area.
                    Close to the whole thing is pretty messed up. It's weird cuz it's only on that side... Do i have any other options?
                    I was thinking of maybe extending the brace back to the auto slot and keeping what's left of the bolt mounting on the manual slot as a backup - it holds-ish, but i can't tighten down the bolt for fear of ripping it through
                    1988 Atlantisblau Euro/Japanese 325i Cabriolet
                    1989 Schwartz 325i - now M50 powered! - now very dead
                    1998 Toyota 4Runner Limited
                    My 17,000km Big NA National Parks trip!

                    Comment


                      #11
                      Originally posted by Sea Aych View Post
                      Close to the whole thing is pretty messed up. It's weird cuz it's only on that side... Do i have any other options?
                      I was thinking of maybe extending the brace back to the auto slot and keeping what's left of the bolt mounting on the manual slot as a backup - it holds-ish, but i can't tighten down the bolt for fear of ripping it through
                      Bump?
                      The whole 6" slot is done. Should i cut and weld or weld an extension to the trans brace so i can put a bolt into the clean slot for the auto transmission?
                      1988 Atlantisblau Euro/Japanese 325i Cabriolet
                      1989 Schwartz 325i - now M50 powered! - now very dead
                      1998 Toyota 4Runner Limited
                      My 17,000km Big NA National Parks trip!

                      Comment


                        #12
                        What did you end up doing? I have a similar problem on my e30, only on the drivers side.

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                          #13
                          interested to know as well


                          --Mike
                          (OO=[][]=OO) For Life

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                            #14
                            Most likely cutting and welding new material there.
                            2014 Alpine White 335i MSport
                            (Daily Driver)
                            Full Mperformance Aero

                            2007 Black Sapphire Metallic E92 335i (6MT)
                            KW V2 Coilovers
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                              #15
                              Originally posted by codyep3 View Post
                              Most likely cutting and welding new material there.
                              i mean one would guess that, but is a welded patch enough to support a tranny? I don't know.


                              --Mike
                              (OO=[][]=OO) For Life

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