1962 Evinrude 40 HP fuel leaking around drain valve

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  • March 8, 2025 at 7:40 pm #294508
    pinka

      The engine runs great, but I have been smelling some fuel under the cover and noticed fuel near the drain valve gasket. It runs down onto the engine mount and streaks down the outside of the exhaust tube.   I am unsure exactly where it comes from, but the area around the drain valve is the wettest.  Is it possible that the drain valve gasket is leaking that much?  It looks dry above it.  The area under the carb is fairly dry.  I recently replaced the upper crankshaft seal. It idles much better at low speeds, but this leak seems to be getting a bit worse.  Thanks for any help.  I am not familiar with what the drain valve does.

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      March 8, 2025 at 11:56 pm #294513
      fleetwin
      Participant

        Could be one of the drain box gaskets, could be leaky crankcase halves….Guess I would try to wash it off, then watch closely while it is running..

        March 9, 2025 at 8:28 am #294514
        crosbyman
        Participant

          Canada Member

          hose looks like the oil return hose that send crankcase  fuel oil residues back to the top bearing  to oil it  whereas the other picture  shows  the purge valve cover.  the hose may have a split in   it causing  leak  or the purge  valve cover   may be leaking as well.

          has suggested  by fleetwin try to oberserve exactly where it  leaks or one possibility  is  if you  use some UV light  dye  liquid in a small  fuel  supply  fed into the carb.  Run the engine and  use  a UV light to “light” up the leak

          I hope you can see attached pics because that silly blue circle still shows up  🙁  for me anyway

           

          your 62 40 hp  is cousin with the RD24 johnson.  this service manual is always useful  in servicing oldies

          https://watercraftmanuals.com/outboard/johnson/manuals/johnson-302231.htm

          Joining AOMCI has priviledges 🙂

          March 9, 2025 at 8:49 am #294517
          crosbyman
          Participant

            Canada Member

            Purge-valve-modifiction-article-1

            just  information on those purge valves making old outboards dirty…due to there dumping residues in the lake !

             

            article states that at idle    1 liter per 20  gets waisted (dumped in the lake)  so collected juices are  just put back in the gas tank  !

            Joining AOMCI has priviledges 🙂

            March 9, 2025 at 2:04 pm #294523
            pinka

              Thanks for the tip on recapturing the fuel from the drain valve.  I was wondering if there was a way to do that.  I don’t like leaving slicks in the lake, but I do enjoy this old engine.

              Once I get it out in the spring, I will see what happens when it runs.  Since the drain valve seal is cheap and easy to replace, I might replace it to see if that does it.

              If it is the crankcase seal, can I assume I need to tear down the whole engine to repair it?   🙁

              As always, I am thankful for these forums and the knowledge shared here.

              March 9, 2025 at 3:02 pm #294524
              crosbyman
              Participant

                Canada Member

                if you are referring to the purge valve   gasket ………you can probably just cut one up  with gasket paper  an exacto and paper punch

                one of those  rotating head leather punches also works good for small  gasket holes

                if you did not  remove the cover I doubt it leaks

                Joining AOMCI has priviledges 🙂

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