1953 evinrude big twin 25hp

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  • March 17, 2022 at 10:13 pm #256411
    Rick Hessler
    Participant

      US Member

      Already posted, maybe, can’t find my post.  Trying again. Apologize if I’m duping

      question is: what is the purpose of the “leaf valve”.   Not the leaf plate behind the carb.

      the leaf valve is depicted in the pics. The 3rd pic is a deconstruct from a parts motor I have. Same part tho.

       

      March 17, 2022 at 11:44 pm #256432
      crosbyman
      Participant

        Canada Member

        that is the  crankcase   one way out valve to push out crankcase  fuel oil residues    aka   purge valve

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        March 17, 2022 at 11:54 pm #256433
        crosbyman
        Participant

          Canada Member

          see pic .

           

          rick this well explained in the johnson maint. manual  (RED BOOK)

          btw  some have  modified with a extra nipple and send the oily residues back to the pressure tank  air line using  check valves   or in  a on-board  reservoir  (tank) to collect   the oily stuff rather than dumping it out in the lake  via the exhaust

          you can download yourself a copy go to :

          • MEMBERS ONLY tab
          • INNER SANCTUM
          • FIND…the LIBRARY
          • Go down to GARRY SPENCER’S DROP BOX
          • go down the list and find the  RED BOOK
          • DOWLOAD the file to your PC   and have it printed locally at a print shop (cheaper)   400 pages of info  on oldies  🙂

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          • This reply was modified 3 years, 10 months ago by crosbyman.
          March 18, 2022 at 12:02 am #256437
          crosbyman
          Participant

            Canada Member

            Gas / fuel leak help on a 1954 25hp Johnson RD-15 | Antique Outboard Motor Club,Inc – Part 2 (aomci.org)

            Joining AOMCI has priviledges 🙂

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