1962 Johnson Fisherman (5.5) questions…

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  • August 28, 2016 at 3:35 am #5087
    amuller
    Participant

      Am finally getting this back together. Changing the impeller on these is a bit of a project as the powerhead has to be dismounted to disconnect the shift rod…

      The shift rod on mine is not entirely straight–it has a bit of a curve to it. It doesn’t seem to interfere with shifting but might put a side load on the seal. Are these supposed to be straight or is the curve normal? I’m thinking maybe it was bent during a previous impeller change.

      There is a small tube running from the area of the bottom main bearing to the top main bearing. I presume this is to move puddled fuel up. And there is a "leaf valve" on the lower stb. side of the "cover plate" but it has no separate cover. Are these things connected? Is this a crankcase drain system such as recently discussed?

      I see that the rather similar J6R powerhead from the mid 80s has some sort of crankcase drain but how it works isn’t obvious. It does not seem to have a transfer tube….

      If there is a way to install a recovery system on these little motors I’d like to know about it.

      August 28, 2016 at 4:00 am #42814
      garry-in-michigan
      Participant

        Lifetime Member

        There IS supposed to be a slight curve is the shift rod. The line up the side feeds oil rich mix to the top bearing. surplus is thrown by a slinger ring into a cavity above the top bushing which is drained into the intake manifold. If oil shows up in the magneto, check the hole at the top behind the intake manifold in the leaf plate and gasket. . . . 😉

        Garry

        August 28, 2016 at 4:12 am #42815
        Mumbles
        Participant


          The small leaf valve is the check valve for the crankcase drain. These models dumped excess fuel straight into the exhaust housing and into the water while later six horse models eliminated this system.

          August 28, 2016 at 7:10 pm #42840
          amuller
          Participant

            I am learning a lot. Interesting that some of the design features that make these motors so useable even after 50-60-70 years are not very desirable from an environmental point of views.

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