tn27 impeller 375688 now sierra 18-3001 ??

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  • January 22, 2018 at 5:25 pm #9055
    crosbyman
    Participant

      Canada Member

      will the sierra 18-3001 fit directly as a replacement to the original 375688 prop ???

      I have a spare JW impeller on hand.. would that fit a TN 27??

      Joining AOMCI has priviledges 🙂

      January 22, 2018 at 6:03 pm #70048
      Mumbles
      Participant

        The new impellers thickness and diameter are the same as the original but the TN shafts were slightly larger in diameter than the later small OMC motors. If the impellers bore is honed out a bit, it will fit right in.

        This applies to the TN-26 but I’m sure the TN-27 shaft size would be the same.

        January 22, 2018 at 6:34 pm #70049
        frankr
        Participant

          US MEMBER PAY BY CHECK
          quote Mumbles:

          The new impellers thickness and diameter are the same as the original but the TN shafts were slightly smaller in diameter than the later small OMC motors. If the impellers bore is honed out a bit, it will fit right in.

          This applies to the TN-26 but I’m sure the TN-27 shaft size would be the same.

          Slight typo there I think. The TN shafts are larger, not smaller than the 3, 5.5, 7.5. So, bore the impeller out to fit a TN-xx.

          January 22, 2018 at 8:16 pm #70051
          crosbyman
          Participant

            Canada Member

            great I’ll test this out with my spare impeller for a JW

            Joining AOMCI has priviledges 🙂

            January 22, 2018 at 8:48 pm #70053
            Buccaneer
            Participant

              US Member

              I saved this in my files from a long ago post,
              regarding TN-28’s. Are they they same as the TN-27’s?
              Also, a page regarding the carbon seals.

              Attachments:

              Prepare to be boarded!

              January 22, 2018 at 9:21 pm #70056
              crosbyman
              Participant

                Canada Member

                thanks… saw that article in the Johnson maintenance bible… i’ll measure my tn27 shaft and drill the impeller out

                thanks

                Joining AOMCI has priviledges 🙂

                January 22, 2018 at 9:37 pm #70057
                Mumbles
                Participant
                  quote FrankR:

                  Slight typo there I think. The TN shafts are larger, not smaller than the 3, 5.5, 7.5. So, bore the impeller out to fit a TN-xx.[/size]

                  Slight typo is right! I was just checking to see if everyone was on their toes this morning and you certainly were! Thanks for catching that! 😳

                  January 22, 2018 at 9:45 pm #70058
                  frankr
                  Participant

                    US MEMBER PAY BY CHECK

                    All TN’s are same size. I’m thinking the shaft is 0.437" but could be wrong. Now I gotta go out and measure one. A few years ago, I tooled up to bore those things to sell, but discovered that another club member was already doing it. So I didn’t go into competition with him. Now I don’t remember who it was.

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