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  1. diveboss

    1957 Johnson 35hp overheating

    Checked the water inlet behind the prop and the plug is in place and sealed. I will put the lower unit apart this weekend and have another look at the impeller. Is there any good way of doing a water pressure test to see if there are any restrictions while I have it apart?
  2. diveboss

    1957 Johnson 35hp overheating

    What do they call test rides if not Sea trial? Lake trial? Lol I hate to check that impeller again as I’ve done quite a few, but thinking I will double check it as that is the easiest. First will check that plug behind the propeller, but not sure if that would matter as it ran hot in the barrel...
  3. diveboss

    1957 Johnson 35hp overheating

    I have not pulled the cylinder head, but thinking that may be the next step? Just trying to avoid that, but need to figure this out before something goes boom. As mentioned, I did blow air through everything when checking the impeller and it seemed to pass through fine. The boat only sees...
  4. diveboss

    1957 Johnson 35hp overheating

    I have the unique situation where I have twin ‘57. 35hp on the same boat, so am constantly tuning them to be sync’d as good as possible. When recomissioning this spring and running the motors in a barrel, I noticed the port motor was not pushing much water out the exhaust, so became suspicious...
  5. diveboss

    1957 Johnson 35hp charging system

    i have a 1957 johnson 35 hp with generator charging system that is not working. I had generator tested and seems to be fine. Adjusted polarity, but still not charging battery. Battery shows 12.9v without engine running, and about the same when running, even at high speed.. I’m thinking it will...
  6. diveboss

    1957 Johnson 35 starter turning slowly

    Bringing back to life a 1957 boat that came from the factory with twin Johnson 35hp motors that has been stored in a garage since 1963. Replaced coils,wires,points, impeller, rebuilt carb on both motors. One of the motors has a generator and is connected to a starter box that appears to have a...
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