Using different crankcase halves

Home › Forum › Ask A Member › Using different crankcase halves

Viewing 5 posts - 1 through 5 (of 5 total)
  • Author
    Posts
  • August 25, 2022 at 5:19 pm #264954
    bob-d
    Participant

      US Member

      Just picked up a 33 HP powerhead . In shipping  the front part of the crankcase got beat up. A few of the long electric starter studs broke, and the bosses got chewed up as well. Tried to drill out the broken existing studs to no avail.
      Here is the question……I can pick up a used front portion pretty cheap, or would it be better to have the “mated” front portion welded, and tapped for studs, which probably would be double the amount of the used piece.
      If that is the better way to go, can anyone recommend a welder who they have used.
      Thanks,

      Bob D

      DCD756FC-0C45-41CA-92A8-9FBCF5E1B36D

      August 25, 2022 at 6:51 pm #264960
      frankr
      Participant

        US Member

        I would be really surprised if a front half from another motor would be a fit.  The cylinder and crankcase halves are bolted together, THEN machined for the bearings.  Chances are pretty slim that a different pair would be a match.

        August 26, 2022 at 5:50 am #264969
        billw
        Participant

          US Member

          It’s hard to tell from one picture; but if it were me, I would redouble my efforts to get the broken studs out and use that piece, as is. Even the lower boss appears to have enough meat left to be usable, without welding, and seems like a MUCH better option than using a different front half.

          Long live American manufacturing!

          • This reply was modified 2 years, 2 months ago by billw.
          • This reply was modified 2 years, 2 months ago by billw.
          August 26, 2022 at 9:05 am #264975
          labrador-guy
          Participant

            US Member

            bob-d, I tried to mix cases on a 5.5hp and they would not work.   I could not see why but every time I tightened the bolts the crank would not turn.  I bought a 1955 that had a ventilated crankcase, reed block side.  Had to find a different power head.

            dale

            “We made too many wrong mistakes.”  YB

            August 26, 2022 at 12:26 pm #264980
            bob-d
            Participant

              US Member

              Well the verdict is in on this one. I’m not even going to try a different front case.
              I really don’t want to try to remove the embedded studs and screw it up.
              I’m going to send it out to a machine shop.
              Thanks everyone for reinforcing what I suspected.

              Bob D

            • Author
              Posts
            Viewing 5 posts - 1 through 5 (of 5 total)
            • You must be logged in to reply to this topic.