58 Johnson 5.5hp drive shaft length

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  • November 24, 2021 at 4:53 pm #250210
    drifter
    Participant

      I’m converting a CDL-15 (58 Johnson 5.5hp) back to a standard-length lower unit. Searching through my parts stash I find several drive shafts that “look” right but I’d like to verify the length to make sure it is a proper fit.
      My drive shaft measures 20 5/16″ in total length.
      Is that the correct drive shaft?
      Thanks for the help.
      Nick

      November 24, 2021 at 5:23 pm #250211
      fleetwin
      Participant

        US Member

        Are you measuring the complete driveshaft, or just the upper shaft?

        November 24, 2021 at 6:10 pm #250213
        Mumbles
        Participant

          Twenty and five is a good number for your driveshaft. Just don’t use it in a CD-10, 11, or 12 as those motors use a slightly shorter shaft and using this one could bind it up.

          November 25, 2021 at 7:41 am #250238
          drifter
          Participant

            Just the upper drive shaft.

            November 25, 2021 at 7:58 am #250240
            drifter
            Participant

              The 20 5/16″ drive shaft measures 1/4″ shorter than the other drive shafts I have. I was thinking the 20 5/16″ is the proper one and not the 20 9/16″.

              November 25, 2021 at 8:42 am #250242
              drifter
              Participant

                I’m probably over thinking this but it appears that the drive shaft measures….7/8″ from the top of the shaft to the casting after installation. In other words, it protrudes 7/8″ above the casting.

                November 25, 2021 at 12:23 pm #250260
                Mumbles
                Participant
                  drifter wrote:

                  I’m probably over thinking this but it appears that the drive shaft measures….7/8″ from the top of the shaft to the casting after installation. In other words, it protrudes 7/8″ above the casting.

                  What casting? Can you post a photo?

                  November 25, 2021 at 12:50 pm #250262
                  drifter
                  Participant

                    the measurement from the gasket surface to the top of the shaft.

                    Upper-Drive-shaft

                    • This reply was modified 3 years, 5 months ago by Mumbles.
                    November 25, 2021 at 12:58 pm #250264
                    drifter
                    Participant

                      By the way…the photo I posted is a CD-20 not the CD-15 I’m referring to in the above questions. I only posted the CD-20 as an example of the measurement I was asking about for the CD-15.
                      Sorry for any confusion. I just don’t want to error by installing too long a drive shaft.

                      November 25, 2021 at 1:39 pm #250267
                      Mumbles
                      Participant

                        Without having a CD setup handy, couldn’t you measure the depth of the spline area on the powerhead? If it quits raining I’ll go out to the shop and measure one.

                        On these two piece driveshafts, The shaft should be rotated as it is inserted into the shock absorber as there is a socket it fits into at the bottom of the shock absorber. Usually you can feel it drop in the last little bit.

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