1957 QD18 10HP Crankshaft Specs

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  • May 4, 2021 at 10:31 pm #237731
    Dave
    Participant

      US Member

      I am looking for the service specs for this crankshaft, specifically the center bearing and both of the piston rod journals. I found some info on this site showing the center bearing limits .9990-.9985 in. If that is correct great, but I did not find- or I did not understand- the limits for the two crankshaft/piston rod journals. Thanks in advance to anyone with the info.

      Dave Strickland
      1957 Johnson QD-18H 10HP

      May 5, 2021 at 6:34 am #237734
      frankr
      Participant

        US Member

        Top 0.8120 – 0.8125
        Center 0.9985 – 0.9990
        Bottom 0.8120 – 0.8125

        Crankpins 0.8145 – 0.8150

        • This reply was modified 2 years, 12 months ago by frankr.
        May 5, 2021 at 6:59 am #237736
        fleetwin
        Participant

          US Member - 2 Years

          Be sure to check the wrist pins/bushings for excess wear, this is a common issue with the 10hps before 1960….

          May 5, 2021 at 3:01 pm #237790
          Dave
          Participant

            US Member

            thanks

            May 6, 2021 at 9:07 pm #237884
            Dave
            Participant

              US Member

              I have a good crankshaft. Top and bottom bearings are within a 10 thousandth, at .8123 The middle bearing is at .9986, and the crankpins are .8155 Thanks for all the help!

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