1958 Evinrude 18hp Fit of piston pin to piston

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  • February 23, 2024 at 3:33 pm #285272
    olcah
    Participant

      US Member

      Trying to make a good motor from several parts motors.

      I want to use a piston from one motor and a piston rod and pin from another.  I notice that the piston pin slides easily into the piston bosses.  The pin can turn freely when it is in the piston bosses.  I would expect the pin to be somewhat tight when it is in the piston but it is not tight.  It is not loose either.  It just can be moved back and forth easily.  I can not feel any clearance between the pin and the piston bosses but there has to be some for the pin to move.

      Just want to ask those with experience if this is ok.

      Thank you.

      February 23, 2024 at 5:28 pm #285279
      frankr
      Participant

        US Member

        Normally, the pin is a slip fit in one side of the piston and a press fit in the other side.  The slip side is marked with a “L” inside the piston.  Install pin through the loose side first.

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        olcah
        February 23, 2024 at 5:38 pm #285280
        olcah
        Participant

          US Member

          Thank you.  I guess I will just put it together, even with both sides slip fit.

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