1957 QD18 10HP Crankshaft Specs

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    320guy58

    Replies: 2
    Topics: 2
    May 4, 2021 at 10:31 pm #237731

    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

    frankr
    frankr
    US Member - 1 Year
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    May 5, 2021 at 6:34 am #237734

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

    Crankpins 0.8145 – 0.8150

    • This reply was modified 1 week, 4 days ago by frankrfrankr.
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    fleetwin
    US Member - 2 Years
    Replies: 3775
    Topics: 38
    May 5, 2021 at 6:59 am #237736

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

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    320guy58

    Replies: 2
    Topics: 2
    May 5, 2021 at 3:01 pm #237790

    thanks

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    320guy58

    Replies: 2
    Topics: 2
    May 6, 2021 at 9:07 pm #237884

    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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