Why is this happening?

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  • February 14, 2016 at 12:42 am #3639
    johnyrude200
    Participant

      So I have a head scratcher. Ive gone through about 20 of the old 18-20-25’s this winter, and have found two gearcases where part #6 on this link http://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1964&hp=18&model=18402&manufacturer=Evinrude&section=Lower+Unit+Group

      has been sitting in one of the gearcase voids. How is this getting loose, and do I really need to pull the powerhead and replace it?

      I dont have an exhaust housing in front of me (at bingo), but doesnt this just deflect water from the powerhead more down the exhaust, restricting what we see out the blubber hole?

      I suspect it also helps prevent ‘stuff’ from getting into the cylinders via the exhaust ports when themotor isnt running…perhaps lessen noise?

      February 14, 2016 at 12:52 am #31927
      chris-p
      Participant

        Interesting. Never seen one come off before.

        I believe they are a simple necessity, as the hole was needed for manufacturing, then the plate was added to block it?

        Perhaps Im wrong.

        February 14, 2016 at 2:47 am #31936
        Mumbles
        Participant

          I think it restricts the amount of exhaust going out the idle relief passage so it doesn’t become the main exhaust outlet. Not really necessary for the motor to run but it is there for a reason. The 50’s classics had tubes on the plate and yes, they would occasionally come loose to. If you clean the threads and use a bit of Loc Tite, it won’t go anywhere.

          February 14, 2016 at 12:03 pm #31949
          frankr
          Participant

            US Member

            Like a noisy muffler if it is missing.

            February 14, 2016 at 12:19 pm #31951
            billw
            Participant

              US Member - 2 Years

              Well, be thankful, in a way, that it fell off. On salt water motors, I’m not sure TNT would get those screws out.

              Long live American manufacturing!

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