1936 Johnson Model 100 gearcase seal part# ?

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  • May 24, 2019 at 4:39 pm #175920
    second wind
    Participant

      Anyone have a good aftermarket part number for the gearcase seal on a 36′ model 100 1.7hp? Kind of unusual; the brass outer O.D of the seal does not press fit inside the bore of the gearcase seal retainer housing; instead it presses OVER the O.D. of the seal retainer lip.
      I got this little gem a couple weeks ago; cleaned the tank and carb, cleaned, filed and set the points, installed a new spark plug, made some carb needle packing from cork gasket material and added a small “o” ring to the needle shaft for redundancy. I put her in my tank and she fired and ran on the second pull. I used a laser non contact thermometer to keep an eye on the cooling and all was good. Everything in the gearcase looks good just need a new seal and I will be pulling my grandson on his slalom ski in no time! 🙂

      Many thanks!
      Neal

      May 24, 2019 at 7:04 pm #175935
      2fast4me
      Participant

        Hope to see pictures of your son skiing soon. Sorry no comment about your seal question i haven’t been there yet.

        2Fast4Me

        May 24, 2019 at 9:26 pm #175950
        Buccaneer
        Participant

          US Member

          I had one apart last year, but I neglected to take photos of that section.
          I have run across some strange seals as well.
          Could your seal be a two piece affair, and only half came out?
          I have used cork and packing material where all else fails
          in finding a replacement for these early ones.

          Prepare to be boarded!

          May 27, 2019 at 5:11 pm #176141
          second wind
          Participant

            It is a single lip seal. Brass with leather sealing surface. I am going to take it along with the shaft and the housing that it installs on to a bearing and seal shop tomorrow. If I locate one that fits I will post the brand and P/N# here.
            Many thanks
            Neal

            May 30, 2019 at 6:00 pm #176399
            second wind
            Participant

              For anyone interested ; C/R (Chicago Rawhide) seal part # 4931 appears to work in this application. I installed and ran in tank today with no leakage issues (so far). I am going to use this for a kicker motor on my 60′ Mahogany Speedliner it is powered by a 56′ RD18 Johnson. I appreciate everyone’s input and plan to become a member soon.
              best regards,
              Neal

              May 30, 2019 at 6:08 pm #176400
              Buccaneer
              Participant

                US Member

                Thanks for the part number, I added it to my notes.

                Prepare to be boarded!

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