1955 johnson RD-17 25 hp Gear Case Screw Removal

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  • November 27, 2025 at 9:09 am #301831
    Max Fowler
    Participant

      US Member

      I am trying to open up the gear case on the motor, but the screws won’t budge. Thought I would come here for help BEFORE destroying the screw head. I am looking for tips on how to get them out. Obviously they are screws, so they should unscrew, but I was wondering if there was locktite used on them, or if they are just corroded in place?

      Thanks in Advance.

      - Max

      November 27, 2025 at 9:23 am #301833
      Buccaneer
      Participant

        US Member

        Heat from a little propane bottle torch and an impact driver
        should get them loose.
        If you have no impact driver, heat up the case around the bolt,
        the wrap on your screwdriver handle a few good wallops before
        trying to loosen the bolts.
        Leverage on your screwdriver, i.e., a adjustable wrench or vice-grips
        comes in handy also.

        Prepare to be boarded!

        1 user thanked author for this post.
        Max Fowler
        November 27, 2025 at 10:02 am #301835
        crosbyman
        Participant

          Canada Member

          sometimes   when they won’t unscrew  a short burst of an impect driver (1/4 inch no bigger) clockwise  then  reversed CCW  will break the bond.

          make certain you firmly push against the screw slots so the  proper sized blade will not skip out !

          Joining AOMCI has priviledges 🙂

          November 27, 2025 at 10:11 am #301836
          labrador-guy
          Participant

            US MEMBER PAY BY CHECK

            Max as a last resort use a center punch.  Make a divot with your punch then angle it a little to force the screw to turn counter clockwise.  We used this trick on motorcycle screws many moons ago!

            dale

            happy days!

            November 27, 2025 at 10:27 am #301837
            Max Fowler
            Participant

              US Member

              Thank you. I got them out with the torch and wrench on a screwdriver.

              - Max

              November 27, 2025 at 10:30 am #301838
              crosbyman
              Participant

                Canada Member

                Planning to replace all seals    shift  drive & prop  ?

                 

                got the  free book  ?

                https://www.socalaomci.com/library/johnson_service_manual_10th_edition.pdf

                Joining AOMCI has priviledges 🙂

                November 27, 2025 at 10:55 pm #301852
                joecb
                Participant

                  US MEMBER PAY BY CHECK

                  Max, go ahead and buy one of the hand impact drivers that was mentioned, you will be using it in the future on tight screws, Very effective tool and not expensive.

                  Joe B

                   

                  November 28, 2025 at 10:56 am #301870
                  outbdnut2
                  Participant

                    US Member

                    I use the impact screwdriver from Home Depot at the link below. Works great!
                    Dave

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