1955 CD12 Johnson driveshaft clutch spring dimension question

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  • February 23, 2016 at 5:03 pm #3699
    jerry-ahrens
    Participant

      US Member

      I’m working on a 5 1/2 CD12, and I suspect I have a broken spring. Can someone give me the correct dimension [length] of a good assembled spring/shaft assembly? I haven’t taken it apart yet to see, but the motor seems to be binding up. I can’t seem to find this dimension in the service manual. Thanks so much!

      February 23, 2016 at 5:32 pm #32393
      Mumbles
      Participant

        6 11/16 is a good number for the shock absorbers as they start to rub at 6 3/4. If yours measures on the long side, they can be pressed with a vice to bring them back to size again. They seem to wind up and stretch after the prop hits something hard and seldom does the spring itself ever break.

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        February 23, 2016 at 6:06 pm #32397
        jerry-ahrens
        Participant

          US Member

          Thanks Mumbles. Looks like mine is right at 6 3/4. I’ll give the vise trick a try. I have a couple more of these that are noticeably longer so maybe they are broke inside.

          February 23, 2016 at 7:36 pm #32401
          frankr
          Participant

            US MEMBER PAY BY CHECK

            Actually, if you clean out the hole real good and get it out in the bright light, you can peer in and see if the spring is broken (usually).

            February 23, 2016 at 8:14 pm #32403
            1946zephyr
            Participant

              Well, luckily, your upper bearing isn’t grenaded out. While you have it apart, I would suggest tack welding the halves, so they don’t blow apart again. 🙂

              February 27, 2016 at 8:26 pm #32572
              jerry-ahrens
              Participant

                US Member

                Ok, the vise trick worked great. I was able to reinstall the shock absorber spring and along with a new shift shaft O ring I’m ready to go. Thanks for the help!

                September 7, 2021 at 10:31 am #246293
                amuller
                Participant

                  I’ve had success with the vise approach. It’s probably a good idea to keep a check on the motor for free rotation. If you weld it solid, be sure to use a brass or similar drive pin that can shear if needed, as you will have eliminated the protection of the shock absorber.

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