1962 Johnson Fisherman (5.5) gearcase

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  • August 14, 2016 at 9:18 pm #4981
    amuller
    Participant

      finally doing the water pump in this, not a trivial job due to the necessity of dismounting the powerhead to disconnect the shift rod. No issues with the pump, but I unintentionally dislodged the pinion bearing housing and see that there is noticeable wear and galling on the thrust surface of the housing. It appears that there is no thrust washer–the upper surface of the pinion just runs against the housing. (Though many of the parts breakdowns do show a separate pinion shaft and a thrust washer.)

      I see no sign of gear failure. But, I don’t know how much wear on the thrust surfaces is to be expected or how to evaluate the dimensional loss.

      can anyone advise?

      PS: I also notice the parts breakdown seems to show the pump mounting screws as shoulder bolts, but ones in the motor are just ordinary machine screws? This important?

      August 15, 2016 at 12:01 am #42085
      beerman57
      Participant

        You really had to pull the powerhead to drop the lower unit? I have a ’62’ Evinrude 10hp and don’t have to.

        August 15, 2016 at 12:04 am #42086
        fleetwin
        Participant

          US Member

          I’m confused again…Where is the wear? Between the lower driveshaft and the bottom of the upper seal bushing housing? Or, is the wear between the thrust face of the pinion and the mating surface on the gearcase housing?
          I’m guessing it is the first scenario…If so, the upper seal/bushing housing dislodged when you pulled the water pump screws because the driveshaft shock spring has broken/been damaged forcing the lower driveshaft into the bottom of the bushing/seal housing damaging it…
          Post some pictures to avoid any confusion….

          August 15, 2016 at 12:20 am #42088
          amuller
          Participant
            quote beerman57:

            You really had to pull the powerhead to drop the lower unit? I have a ’62’ Evinrude 10hp and don’t have to.

            On these you do because there is no other way to disconnect the shift rod. No access window.

            August 15, 2016 at 12:23 am #42089
            amuller
            Participant
              quote fleetwin:

              I’m confused again…Where is the wear? Between the lower driveshaft and the bottom of the upper seal bushing housing? Or, is the wear between the thrust face of the pinion and the mating surface on the gearcase housing?
              I’m guessing it is the first scenario…If so, the upper seal/bushing housing dislodged when you pulled the water pump screws because the driveshaft shock spring has broken/been damaged forcing the lower driveshaft into the bottom of the bushing/seal housing damaging it…
              Post some pictures to avoid any confusion….

              Second scenario–thrust face of the pinion against the housing. There is no shock spring on these; they rely on a rubber hub in the prop. Sorry if I was unclear.

              August 15, 2016 at 12:42 am #42091
              wedgie
              Participant

                Here’s the ’62 Johnson 5.5 parts diagram from Marine engine. I’ve highlighted the shock. Your Fisherman should be the same.

                August 15, 2016 at 1:17 am #42093
                fleetwin
                Participant

                  US Member

                  Like Wedgie says, these engines were equipped with the shock gearcase and solid prop….I suppose someone could have converted the later model gearcase (with rubber prop hub/no driveshaft shock) to fit though…
                  Post some pictures of the worn parts…

                  August 15, 2016 at 3:42 am #42099
                  amuller
                  Participant

                    Well, now, this is interesting. What came out of the motor was a one-piece drive shaft from the crank to the pinion gear. But the parts breakdowns up until the end of 5.5s in 1964 show the shock spring setup. I’ll pursue this tomorrow and take some pics.

                    August 15, 2016 at 6:33 am #42102
                    retiredoz
                    Participant

                      Somebody pilfered a drive shaft from a later 6-hp..

                      August 15, 2016 at 8:57 am #42106
                      fleetwin
                      Participant

                        US Member

                        I think they would have had to switch more than just the driveshaft because the lower pinion diameters are different on the two different style driveshafts….
                        I guess it is also possible that someone did just swap the driveshafts without realizing the dimensions were different, which might explain why the pinion is worn…..It will be easy to test my theory by simply installing the driveshaft down through the lower gearcase bushing to see if there is excessive clearance…

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