1957 Johnson 3hp JW-13 Operating temp

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  • April 7, 2022 at 9:23 am #257606
    Bob Foscato
    Participant

      Hi,

      I have a 1957 Johnson 3 hp JW-13 with Head Temps near Spark plugs between 140 to 190 degrees F.

      It has a new impeller, the Tube to the engine block is clear, there are no obstructions in the engine block, plenty of water with pressure comes out of the flush port.
      At the exhaust port all six holes shoot water out 3-4 inches and the water is barely warm.

      Question, Is the motor running hot?

      April 7, 2022 at 10:05 am #257607
      crosbyman
      Participant

        Canada Member

        exhaust side not water cooled and gets very hot and discolored

        have you pulled the cyl head to check & clean  water  passage ways around the cyl walls .  (gasket is cheap and a good investment for peace of mind.)

        check  for  stuck impeller parts

        Joining AOMCI has priviledges 🙂

        • This reply was modified 3 years, 9 months ago by crosbyman.
        April 7, 2022 at 10:26 am #257612
        frankr
        Participant

          In addition to what crosby said, the cylinder head is water cooled only around the edges.  The center, around the plugs will get quite hot, as there is fire inside there.  Personally, I think your motor is just fine.

          1 user thanked author for this post.
          joesnuffy
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