Motor Bulkhead/Cylinder Union Leak

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  • biggsgolf
    Captain
    • Jan 2020
    • 720

    Motor Bulkhead/Cylinder Union Leak

    Hi,
    I have a tiny leak where the Motor Bulkead Seals to the Cylinder.
    I replaced the O Ring, still a leak. My understanding is that the bulkheads are produced and matched to a cylinder.
    What options do I have? This is the USS Blueback, with the 11/2” Subdriver from Bob.
  • redboat219
    Admiral
    • Dec 2008
    • 2735

    #2
    I hear wrapping teflon tape around the endcap before putting in back into the cylinder helps.
    Make it simple, make strong, make it work!

    Comment

    • He Who Shall Not Be Named
      Moderator
      • Aug 2008
      • 12256

      #3
      I assume you mean 2 1/2" cylinder? And is it the SD or MSD type? Is the leaking O-ring evidencing a solid black 'bead' when made up to the cylinder. If not it's loose?

      You might remove the O-ring, examine the groove and look for dirt or flaws in the channel. Insure the O-ring is clean and well greased.

      Keep me informed. We'll fix this!

      David
      Who is John Galt?

      Comment

      • biggsgolf
        Captain
        • Jan 2020
        • 720

        #4
        Yes, 21/2”. The leak does not exhibit a black bead, I will do as suggested and inspect the O ring and channel. It seems too easy to slide the bulkhead in, it is not as tight as it was originally?
        The teflon tape is an idea I have considered.

        Comment

        • biggsgolf
          Captain
          • Jan 2020
          • 720

          #5

          Comment

          • biggsgolf
            Captain
            • Jan 2020
            • 720

            #6
            The O Ring and channel are as should be... the fit seems loose, not as tight as the battery bulkhead. When I do blow test with the hose the bulkhead wants to push out of the cylinder. Maybe the cylinder expanded from my shop heat?
            Dave, any thoughts on yrying teflon tape? I hate the idea of it not being as should be without tape etc.

            Comment

            • trout
              Admiral
              • Jul 2011
              • 3545

              #7
              I would not worry about using teflon tape. It helps a lot.
              Click image for larger version

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              That repair was done 7 or 8 years go and still works great.

              Peace,
              Tom
              If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.

              Comment

              • He Who Shall Not Be Named
                Moderator
                • Aug 2008
                • 12256

                #8
                Post a bigger photo. OK, that's an SD type. Are there any hair-line cracks of the cylinder over the O-ring?

                David
                Who is John Galt?

                Comment

                • biggsgolf
                  Captain
                  • Jan 2020
                  • 720

                  #9
                  Thanks Tom, so you put the teflon under the O Ring?
                  Dave, sorry yes, SD type, no hairlines visible, will post larger photo, momentarily

                  Comment

                  • biggsgolf
                    Captain
                    • Jan 2020
                    • 720

                    #10

                    Comment

                    • biggsgolf
                      Captain
                      • Jan 2020
                      • 720

                      #11
                      Guys, just occured to me I should call it the motor housing cap, not bulkhead?

                      Comment

                      • He Who Shall Not Be Named
                        Moderator
                        • Aug 2008
                        • 12256

                        #12
                        Originally posted by biggsgolf
                        Guys, just occured to me I should call it the motor housing cap, not bulkhead?
                        Motor bulkhead, damnit!... motor bulkhead!

                        Who is John Galt?

                        Comment

                        • biggsgolf
                          Captain
                          • Jan 2020
                          • 720

                          #13
                          Hahaha, one of my most favorite quotes!

                          Comment

                          • biggsgolf
                            Captain
                            • Jan 2020
                            • 720

                            #14
                            Here is leak video uploaded to youtube

                            Comment

                            • biggsgolf
                              Captain
                              • Jan 2020
                              • 720

                              #15
                              Dave, sorry, yes the O Ring seems to have a thin black bead all the way around, I was confused

                              Comment

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