evinrude 3hp 3012

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  • November 28, 2022 at 5:41 pm #269441
    JEFFREY PLITT
    Participant

      US Member

      hey guys . need a little advice . pulled the pistons out of the 3hp and forgot which way they go back . also , cylinder clean up . what grit would be best on a hone ? thanks

      November 28, 2022 at 6:47 pm #269442
      wedgie
      Participant

        Long side of slope goes to exhaust. I think 40 grit is good. Just a caution not to overdo the honing. Do the minimal to achieve the crosshatch.

        November 28, 2022 at 8:38 pm #269448
        Robert Wight
        Participant

          US Member

          I’d suggest a 240 grit flex hone for the cylinder hone job.

          Bob

          1937 Champion D2C Deluxe Lite Twin
          1954 Johnson CD-11
          1955 Johnson QD-16
          1957 Evinrude Fastwin 18
          1958 Johnson QD-19
          1958 Johnson FD-12
          1959 Johnson QD-20

          “Every 20 minute job is only a broken bolt away from a 3-day project.”
          "Every time you remove a broken or seized bolt an angel gets his wings."

          November 29, 2022 at 12:12 am #269450
          Mumbles
          Participant

            Crossflow-Piston

            November 29, 2022 at 12:22 am #269453
            wedgie
            Participant

              Yeah, 40 is probably too coarse. I think I used some worn out 40 crocus cloth by hand the last time I did it, and it worked ok as I did it  with a light touch.

              Are you planning on lapping the block and cylinder cover too?

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