A25 Gearbox

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  • January 14, 2016 at 1:06 pm #3384
    rapier
    Participant

      All the images of A25s I see on the net have a different shape gear case to the 1926 s/n 33562 A25 I have. Alarms bells are ringing, as the midsection of this is bronze and the gearcase is the same design as the A35/45 and I wonder if this is a bitsa. Did the A25 design change in the later years of production? Pics of the motor below.

      The reason for my asking is that I need a cylinder (has blown / corroded waterways) and need to be sure that I get the right version.

      https://picasaweb.google.com/1118523892 … directlink

      January 14, 2016 at 1:45 pm #30099
      stanley
      Participant

        US Member

        My A25 #39321 has the usual gear case.Yours also to be a long version.

        January 14, 2016 at 2:08 pm #30101
        rapier
        Participant

          Yes, it’s a long version. I wonder whether someone put an A25 powerhead on the A35/A45 leg – I’m no expert, so would that be a possible mate?

          January 14, 2016 at 2:36 pm #30103
          stanley
          Participant

            US Member

            I just took a look at my A25 and A35 side by side.With out actually trying it,I would say the heads would inter-change.Have you checked to make sure your rope plate serial# matches one on crankcase?The differences between the two power heads are pretty subtle.Looking at your pics I’d say yours is definitely A25 and lower unit is from A35

            January 14, 2016 at 3:01 pm #30107
            rapier
            Participant

              Just checked the serial number (lip on the crankcase base, where the piston base mates to it?) and it’s B 7874; which makes no sense to me, as I thought the serial numbers of Johnsons were all numeric to 1959.

              January 14, 2016 at 3:24 pm #30109
              Tubs
              Participant

                A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.

                • This reply was modified 6 years, 9 months ago by Tubs.
                • This reply was modified 4 years, 5 months ago by Tubs.
                January 14, 2016 at 3:33 pm #30111
                stanley
                Participant

                  US Member

                  The fly wheels looks to be from an A25 motor.

                  January 14, 2016 at 3:47 pm #30114
                  rapier
                  Participant

                    Thanks Gents, much appreciated; I never fail to learn something new here. It should be a fun project even if it’s 3 motors.

                    January 14, 2016 at 6:09 pm #30116
                    rapier
                    Participant

                      Pulled the cylinder off and both the piston and cylinder- updated pics.. What’s the baffle for in the port?

                      https://picasaweb.google.com/1118523892 … directlink

                      January 14, 2016 at 6:19 pm #30118
                      stanley
                      Participant

                        US Member

                        Spark arrestor in case of back fire.Some recommend removing them lest they come loose and cause damage.

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