Home Forum Ask A Member 1940 Johnson DT-10 driveline broke?

Viewing 10 posts - 11 through 20 (of 26 total)
  • Author
    Posts
  • #238523
    billw
    Participant

      US Member

      Before getting another drive shaft, look the castings over as best you can, to see if any housings are bent, even a matter of just a tiny bit. While I am not familiar with the unique personality of the DT-10s, usually when a drive shaft just snaps, it’s because of a misalignment somewhere.

      Long live American manufacturing!

      #238596
      wanderlustjake
      Participant

        I will try putting straight edges against the drive tube to see if I can detect any bend. The driveshaft slid out easily, wasn’t bound up.
        Someone mentioned checking the shock absorber on the prop shaft, that slid off easily. Is there a way of checking that for function?

        Thank you.

        #238681
        wanderlustjake
        Participant

          The outer tube appears to be straight. The driveshaft has rust on it and an area towards the bottom that is noticeably galled and necked down. When I put the driveshaft in the tube, it slides in, but doesn’t spin easily. Thinking a replacement driveshaft and driveshaft tube. Experienced minds please chime in. Thank you.

          20210520_193907-min

          • This reply was modified 4 years, 5 months ago by Mumbles.
          #238683
          Buccaneer
          Participant

            US Member

            I’d be wondering about the old driveshaft bushing, if that’s galled up as well.
            Not sure if it’s one that can be easily replaced? Was the broken driveshaft
            seized in the housing?

            Prepare to be boarded!

            #238698
            wanderlustjake
            Participant

              I haven’t looked at the bushing. The driveshaft slid up and out easily. I don’t have a assembly drawing or manual, safe to assume the bushing is below the driveshaft tube in the lower unit?

              #238699
              Buccaneer
              Participant

                US Member

                I don’t see a driveshaft bushing listed as a replaceable part. It would be in the top of the
                gear case foot. The bushing may be cast in place and line bored.

                1939-40-Johnson-5-hp-LTATDT-Parts-Manual

                Prepare to be boarded!

                #238705
                wanderlustjake
                Participant

                  Buccaneer,

                  Thank you for sharing that, seeing the parts is VERY helpful.
                  Your comment jogged my memory, I read somewhere that the gearcase has to be replaced if the bushing is bad. I have a line on a lower assembly that includes a driveshaft. Probably beat to go that route. I should be able to reuse the inner casing tube since nothing bears against it.
                  When you redid your motor, did you pull the inner casing tube? If so how did you remove the tube as it’s slotted at the top?
                  Thanks!

                  #238722
                  Buccaneer
                  Participant

                    US Member

                    I can’t really remember what the “inner casing” tube to which you refer, looks like,
                    and I find no photos showing that I had it apart.
                    Does the parts diagram show it as a separate part?
                    Maybe the lower unit you have an eye on will include the tube?

                    Prepare to be boarded!

                    #238724
                    wanderlustjake
                    Participant

                      It’s what the driveshaft runs through. You have to pull the powerhead to see the the tube and slots. It is a seperate in part. Didn’t know if you took your motor down that far.
                      The one I had the lead on sold yesterday, figures. Working on another lead.

                      #238725
                      wanderlustjake
                      Participant

                        It’s this part

                      Viewing 10 posts - 11 through 20 (of 26 total)
                      • You must be logged in to reply to this topic.