1957 Johnson 35hp Getting Hot

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  • June 24, 2018 at 7:51 pm #10349
    outboardboy3
    Participant

      Hey guys, took out the boat today for the first time in 10 years on the water again! It ran great! Until it started bogging down at full speed, so I took it back to the ramp and discovered the exhaust housing was really HOT. Also the exhaust housing is discolored. It pumps a lot of water, but is still hot. I think the bogging down is a result of the carb, but does it have a temperature switch, and why is it getting so hot? Any ideas? Thanks.

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      June 24, 2018 at 8:09 pm #78389
      frankr
      Participant

        US Member

        Got news for ya—getting hot in that area is normal. You say it was pumping plenty of water, so time to do some more troubleshooting.

        June 24, 2018 at 9:43 pm #78394
        Mumbles
        Participant

          I’m not sure if all the Big Twin/RD motors had this bleeder or drain hole going into the water jacket but it dumps water into the exhaust to help cool it. Might be time to pull the powerhead to see if it’s plugged. A broken piece of an old impeller could easily plug this hole.

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          June 24, 2018 at 10:25 pm #78405
          frankr
          Participant

            US Member

            They were still scorching paint in the 1970’s

            June 25, 2018 at 1:24 am #78421
            garry-in-michigan
            Participant

              Lifetime Member

              If it hasn’t been run in 15 years, I would but in a new impeller – – – 😎

              June 25, 2018 at 1:39 am #78423
              outboardboy3
              Participant

                I did, I installed a brand new impeller. Also, I found the possibility of it not running right, the cap I used to cap the intake barb was split (probably due to the clamp I used to put it on) and had leaked some gas, when I did the single-line conversion. The exhaust shroud may be normal temperature on this motor, I’m not sure. Could it be possible that a water passage is clogged in the powerhead? Thanks.

                June 28, 2018 at 12:05 am #78580
                shoestringmariner
                Participant

                  Are you missing a Welch plug anywhere in there? That happened to me on a 1955 7.5 OMC

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