1954 3.6HP Scott Atwater – Lower Unit Question

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  • October 31, 2015 at 6:53 pm #2887
    kevinrude
    Participant

      What is the purpose of this cavity (red arrow)? There is not any moving part in the cavity, either on the motor side or the cover side. By the looks of the gasket (blue arrow), the gasket does not surround this cavity. The gasket looks like its top horizontal part is at the bottom of the cavity. The reason that I ask is that I have to make a new gasket. Do I just leave the cavity empty? There doesn’t seem to be a reason to fill it with grease or to surround with a gasket. Just making sure I make the gasket properly (original is gone). Thanks.

      October 31, 2015 at 7:03 pm #26326
      Anonymous

        room for wrench when turning ???????

        October 31, 2015 at 7:35 pm #26328
        jim-moffatt
        Participant

          US Member

          The cavity is not used in non-shift motors like yours. In the 5, 7.5 and 10 hp motors the shift fork slides up and down inside it.
          You can leave the gasket solid but I would cut a small hole in it so pressure can be equalized on the two sides of the gasket.
          The gasket thickness determines the gear lash front to rear – use medium thickness gasket material about 1/32" or fit by trial.

          October 31, 2015 at 8:45 pm #26330
          kevinrude
          Participant
            quote Jim Moffatt:

            The cavity is not used in non-shift motors like yours. In the 5, 7.5 and 10 hp motors the shift fork slides up and down inside it.
            You can leave the gasket solid but I would cut a small hole in it so pressure can be equalized on the two sides of the gasket.
            The gasket thickness determines the gear lash front to rear – use medium thickness gasket material about 1/32″ or fit by trial.

            Now I see it! All I had to do was turn the page in my manual to see that is where the gear shift parts go in larger motors. Never occurred to me. Thanks Jim!

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