1957 Evinrude Sportwin 10hp front bearing

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  • April 20, 2021 at 9:28 pm #236731
    Mike Nazarenko
    Participant

      In assembling my 1957 Evinrude Sportwin 10hp propeller shaft gears back into the gear case after inspection there doesn’t appear to be a pin that aligns the front bearing into its place, yet there is a hole for one, part #19 on the Sportwin Gear Case diagram, as well as a hole in the gear housing, photo attached. I do not remember a pin when I disassembled the prop shaft gears, nor is there one that I can see on the gear case parts diagram.

      For the rear gear housing and assembly part #25 there is a pin in the gear housing that fits the alignment hole on part #25.

      Last month I assembled the gears back into my 1958 10 hp Sportwin and there was an alignment pin in the front gear and a tab for the rear. So this is not consistent.

      My question, does the front bearing and gear case have an alignment pin. It seems like there should be one, is one necessary.

      Thank you.

      April 20, 2021 at 9:43 pm #236736
      frankr
      Participant

        US MEMBER PAY BY CHECK

        Yes, and yes. What would happen if you leave it out? Probably nothing, but why gamble.

        April 20, 2021 at 10:19 pm #236740
        Mike Nazarenko
        Participant

          Thanks for your reply, but I didn’t notice any pin in the gear case for the front bearing only a hole when I took it out, nor is there a pin shown on the gear case parts diagram. I certainly could cut a suitable diameter drill bit to the correct length and insert it. Don’t want to gamble when fabricating a pin to size is not difficult. Thoughts on that.

          Thank you.

          April 21, 2021 at 11:20 am #236751
          Mumbles
          Participant

            The empty hole in the gearcase is where the pin should be and it keeps the thrust bearing from spinning and the oil passages aligned correctly. A piece of drill bit epoxied in will be perfect.

            April 21, 2021 at 12:55 pm #236754
            Mike Nazarenko
            Participant

              Thanks for the reply. I will certainly follow your suggestion.

              2 questions:

              Could the motor have operated all these years without the pin or did I lose it on disassembly.

              Is the pin missing from the parts diagram. The diagram I have is from a 1956 Evinrude Sportwin I could not get a 1957 diagram.

              Thank you.

              April 21, 2021 at 3:38 pm #236755
              frankr
              Participant

                US MEMBER PAY BY CHECK

                Look again at your parts diagram. Picture shows a pin at aft bearing, but if you go to the part numbers page it shows it as part number 300611 Dowel 2 req’d In other words one front and one aft.. It COULD have operated all these years if it didn’t spin, but I’d rather say you or somebody else lost it.

                April 21, 2021 at 5:43 pm #236757
                Mike Nazarenko
                Participant

                  That sounds reasonable and appreciate the comment and most of all that I discovered it before anything got damaged. All components are in very good shape.

                  Will reassemble and hopefully test soon.

                  April 22, 2021 at 1:29 pm #236806
                  Tinman
                  Participant

                    Frankr what’s the answer if a previous owner smashed the pin down because he didn’t align it with the hole in the bearing? Is there a way to remove it? I see that a lot. Thanks.

                    April 22, 2021 at 4:52 pm #236808
                    dave-bernard
                    Participant

                      US Member

                      Redrill both bearing and housing to fit new pin.

                      April 24, 2021 at 7:51 pm #236939
                      1946zephyr
                      Participant

                        It may have gotten lost in the past, perhaps during another disassembly process. Not uncommon. It would be good to put on in.
                        Those lowers in that year are the same as the 18’s of that year, so finding another pin should be easy.
                        Also, that was the last year that the 10hp had the same lower as the 18 too and it’s much better than the lower that was used on the ’58 and later, IMO.

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