“O” ring sub number

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    drifter

    US Member - 1 Year
    Replies: 124
    Topics: 85
    #191687

    Is there a common “O” ring number for the upper drive shaft “O” ring used on many of the 50’s OMC outboards. P/N 0303347 prices seem ridiculous.

    olcah
    olcah

    US Member - 1 Year
    Replies: 360
    Topics: 77
    #191688

    O ring size.

    This might help.

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    crosbyman

    Canada Member - 1 Year
    Replies: 1389
    Topics: 180
    #191743

    oring chart

    Oring-chart-o-ring-

    • This reply was modified 1 week, 3 days ago by MumblesMumbles.
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    lindy46
    lindy46


    Replies: 304
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    #192106

    I bought an o-ring assortment from Harbor Freight and can usually find one that fits.

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    crosbyman

    Canada Member - 1 Year
    Replies: 1389
    Topics: 180
    #192125

    GLM 81110 matches the size maybe a local seal/bearing shop can order it …. might be cheaper

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    outbdnut2

    US Member - 2 Years
    Replies: 1183
    Topics: 61
    #192128

    I also find these in my Harbor Freight assortment.

    https://www.harborfreight.com/382-piece-o-ring-assortment-67554.html

    Dave

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    garry-in-michigan

    Lifetime Member
    Replies: 3506
    Topics: 31
    #192147

    This is what Sierra Marine has . . .

    bobw
    bobw

    US Member - 1 Year
    Replies: 756
    Topics: 31
    #192151

    I’ve used these size charts by finding the appropriate OEM number, verifying the correct dimensions as shown in the chart, then finding the matching size at my local Ace Hardware store where they have drawers full of O-rings.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20

    outboardnut
    outboardnut

    US Member - 2 Years
    Replies: 567
    Topics: 405
    #192235

    But don’t we have to careful in regards to what kind of materiel the O ring is made of?
    Aren’t some O-rings made for water and others are for oil?

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