1929 Johnson Model J-25 Plug Wire

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  • May 4, 2022 at 8:31 am #259401
    The Boat House
    Participant



      I can take a pump apart an to get you piston
      dimensions if you are planning to make a new one.
      Tubs      .

      May 4, 2022 at 8:51 am #259402
      Buccaneer
      Participant

        US Member
        The Boat House wrote:



        I can take a pump apart an to get you piston
        dimensions if you are planning to make a new one.
        Tubs        .

        Thanks Tubs, I’ll clean it up today and see what the diameter of
        the piston is, and perhaps estimate how much of the length is
        missing, and if I need more info., I’ll let you know.
        The real question is, “what” I’m going to find to make a new piston?
        I presume that I’d need to silver solder some “hard facing” of some kind, on the
        end that rides on the cam.

        Prepare to be boarded!

        May 4, 2022 at 8:58 am #259404
        The Boat House
        Participant



          I don’t think there was a hard facing on the piston.
          The piston is sacrificed to persevere the cam on
          the prop shaft gear.
          .

          May 4, 2022 at 10:33 am #259406
          davidk
          Participant

            US Member

            Also consider the surface of the cam.  No sense in rebuilding the piston if a corroded cam will just chew it away.  See this discussion https://www.aomci.org/forums/topic/early-johnson-plunger-for-pump/

            May 4, 2022 at 12:31 pm #259407
            Buccaneer
            Participant

              US Member

              Thanks for the replies. Regarding “hard surfacing”, maybe I was thinking about
              the photo I seen once of someone soldering a nickel onto the piston!
              I decided to reuse the piston, as it was just the one end buggered up.
              I made a stepped brass end where about 1/8″ inch presses into (and soldered)
              the good end of the piston, and another 1/8″ sticks out beyond the end of the
              piston, that rides on the cam.
              That’s all the longer I could make brass end, and still have clearance without
              bottoming out. I suppose one could shorten the piston in order to have a thicker
              brass “wear end”, but this should last quite a while, and forever, if I don’t get
              it running!
              My real thought of the day, how long was this motor ran with that big hole
              in the water pump piston? I can’t see how it possibly pumped any water?
              Photos this evening, I hope.

              Prepare to be boarded!

              May 5, 2022 at 11:13 am #259443
              The Boat House
              Participant

                .

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