1929 Johnson A-45

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  • December 30, 2018 at 11:21 am #161521
    spike
    Participant

      My A-45 seems to be loosing compression in the starboard cylinder even though the release valve is in the closed position, I can both hear it and feel it coming out of the opening in the release valve housing. The valve spring seems to be pulling the valve closed but still leaking compression. Any thoughts or advise as to what to look for before I pull the cylinder?

      December 30, 2018 at 11:42 am #161522
      sydinnj
      Participant

        US MEMBER PAY BY CHECK

        My first guess would be a piece of carbon or dirt holding the valve up just a little bit.

        December 31, 2018 at 12:00 pm #161601
        spike
        Participant

          I pulled the valve assembly,the only carbon was a very small amount on the outside of the valve top. The seating portion of the valve & housing were clean. Everything visually looks good. Gave all a good cleaning reinstalled it, gave it a try, still leaks compression. Nothing shows excessive wear. Am wondering if I could lap the seat as it is aluminum or would it do more damage?

          IMG_0022-1

          • This reply was modified 7 years ago by seakaye12.
          January 1, 2019 at 3:26 pm #161693
          garry-in-michigan
          Participant

            Lifetime Member

            YES – If the cylinder casting is intact (no cracks) definitely lap the valve . . .

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