Home Forum Ask A Member Installing clutch dog in 1950’s OMC lower unit

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  • #308975
    William Jatzek
    Participant

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      Hello. The clutch dog in the lower unit in 1950’s OMC Johnson / Evinrude can be installed either way, but recently someone told me that there is a correct way to install them. Is this true? I was told there is a mark or ring on one side that should face the forward gear. Thank You. Bill,

      #308994
      JACQUES
      Participant

        download this book  it hasall you need to service oldies   see  section on lower unit  pages 389 390 pictures

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

        Cd-clutch-pics

        Joining AOMCI has priviledges 🙂

        #309011
        Steve D
        Participant

          Thanks Frank!

          clutch-dog

           

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          #309021
          JACQUES
          Participant

            cd 10-11-12  specific picture    CD-10-11-12-pic-clucth-dog

             

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            #309149
            William Jatzek
            Participant

              US MEMBER PAY BY CHECK

              Thanks Frank!

              clutch-dog

               

              So, the takeaway from this is that it is noted but really it can go either way. With no ill effects.

              #309183
              Steve D
              Participant

                That’s correct. Usually the practice is to make sure the better side is engaging with the forward gear since that gets used more.

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                #309188
                JACQUES
                Participant

                  btw  if op is inside the GC fixing up things may as well confirn the shock absorber has not stretched beyond 6”11/16 otherwise  .

                  when i did mine  i had a heck of a time closing up the GC and after 2-3 reseals I found mine had somehow streched  and rubbed the underside of the wp enough to cause binding problems.  Had it spot welded shut, filed the weld burs away  and  resealed the GC.  Pressure tested fine after  and… no more binding on the drive shaft

                   

                  • Correct length: about 6 11/16″ (6.69″)
                  • If it stretches to ~6 3/4″ (6.75″) or more, it can start rubbing or binding in the housing.
                  • These shock couplers often stretch after the prop hits something; sometimes they can be pressed shorter again in a vise if not broken.

                  What the shock absorber does:

                  • It’s a spring coupler in the driveshaft that absorbs impact if the prop hits a rock or log.
                  • If it’s too long, the shaft can bind.
                  • If it’s welded solid, you lose that protection and risk damaging the  gears  so using a brass drive pin helps

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