1955 Evinrude 7.5 powerhead

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  • February 7, 2022 at 1:04 pm #254199
    Peter Goodwin
    Participant

      US Member

      Good afternoon,

      I have a 1955 Evinrude 7.5.  The starter seems to be hard to pull.  Thinking it might have been a water pump problem, as the motor did not pump until primed, I pulled it apart and rebuilt the water pump. Prior to reinstalling the powerhead I pulled the starter with the spark plugs out and to me it still seems hard to pull.  After this motor has been running it pulls over easily and runs well.  Any thoughts??

      February 7, 2022 at 4:07 pm #254217
      aquasonic
      Participant

        The the 1954 and 1955 Fleetwins are always hard to pull over when cold. They have a relatively small simplex starter pully. In 1956 OMC introduced the larger eas-a matic starter with a cam design on the Fleetwin that made starting much easier.

        The fact that the motor is still hard to pull over with the sparkplugs out, makes it sound as though there may be a sprung or broken pinion shock. To determine this, the upper bearing and seal housing must be removed. If the bottom of the upper bearing is somewhat mashed, then the shock may be elongated and making contact with the bottom of the bearing.

        Remove the pinion shock, and get a good measurement of the length. It should measure exactly 6-11/16″ long. Any longer, and the shock is sprung or broken. I just removed a broken shock that was 6-13/16″. After a good cleaning, and a look inside with a high intensity flashlight, a 1/8″ separation in the broken spring could be seen.

        Improvise-Adapt-Overcome

        February 7, 2022 at 5:12 pm #254221
        crosbyman
        Participant

          Canada Member

          are  we talking  shock absorber in the GC just below the water pump housing….

          my 5.5  johnson cd11 is also   hard to pull but when I dropped the LU   I had no issues turning the drive shaft by hand  ..shock absorber must have been ok I guess ?   I have yet to run in on the lake   next window is late april 🙁

           

          5.5 and 7.5 are cousins …must be genes

          Joining AOMCI has priviledges 🙂

          • This reply was modified 3 years, 11 months ago by crosbyman.
          • This reply was modified 3 years, 11 months ago by crosbyman.
          February 7, 2022 at 6:17 pm #254229
          Mumbles
          Participant

            Shock-Absorber

            If the shock absorber is binding, you’ll know it when you get it apart.  It should measure 6 11/16″  if I remember correctly and it can be pounded down or pressed in a large vice to get it back to size again.

            • This reply was modified 3 years, 11 months ago by Mumbles.
            February 9, 2022 at 6:55 am #254303
            billw
            Participant

              US Member

              I believe that the OP said his power head was still hard to pull over, even before he put the lower unit back on?

              Long live American manufacturing!

              February 9, 2022 at 7:12 am #254304
              Peter Goodwin
              Participant

                US Member

                Thanks billw, I did say that.  I checked the shock bearing and that seems to be fine.  The thing I can’t understand is why the powerhead is still hard to pull over even with the plus out.  To my way of thinking it should spin over pretty easily.  Once started the motor runs well and is easy to restart.  Maybe it just my old shoulders telling me it hard to pull???

                I also have a 1955 Johnson 5.5 hp and that seems easier to pull.

                February 9, 2022 at 9:41 am #254308
                frankr
                Participant

                  You wrote:  Prior to reinstalling the powerhead I pulled the starter with the spark plugs out and to me it still seems hard to pull.  After this motor has been running it pulls over easily and runs well”.   If it pulled hard with the plugs out but freed up after running, I’d be concerned it might have some rust inside from sitting.  That is not good.  I’d do some investigating.  At the very least, make sure the carbon seal assy on the shaft is 100% good.  A bad seal will admit water into the crankcase, and it can result in a tossed connecting rod.

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