Johnson TD 15 Piston Ring

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  • Rusted Junk

    US Member - 1 Year
    Replies: 69
    Topics: 18
    #243622

    Hi All,
    I am working on a TD15 that I was planning on using as a parts motor but may change directions and see if I can make it run again. The motor showed 50 psi compression. After disassembling the power head the pistons and cylinder walls look good, the rings on both pistons were free. So I thought I would run a ball hone thru the cylinders and put in some new rings, does anyone know the part number for the rings for the motor. This is a low budget build for sure.
    Thanks,
    RJ

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    Mumbles

    Canada Member - 2 Years
    Replies: 5246
    Topics: 282
    #243652

    TD and TN motors have a 1 15/16″ bore and use the same rings as the later 5.5 and 6 horse motors thru ’79 do. P/N 378432 for a two pack, if you can find them.

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    Rusted Junk

    US Member - 1 Year
    Replies: 69
    Topics: 18
    #243654

    Mumbles,
    I have been looking for rings and you are correct they are hard to find, seems they come in a pair , so I would need three of them, Marine Engine wants $75 for a pair, I am not doing that. Since this is a parts motor I may just hone the cylinders and try the old rings, do you know what the end gap should be on the TD15 rings?
    RJ


    Mumbles

    Canada Member - 2 Years
    Replies: 5246
    Topics: 282
    #243657

    0.005 to 0.010 would be ideal.

    TD-TN-Rings

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    The Boat House


    Replies: 3619
    Topics: 91
    #243668


    Contact Dave at Otto Gas Engine Works,
    Standard ring sizes are $5.00 + $.50 Shipping each.
    Tubs
    http://pistonrings.net/rangcast.htm

    You're only as smart as the person you're talking to.

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    Rusted Junk

    US Member - 1 Year
    Replies: 69
    Topics: 18
    #243669

    I will contact him, thanks a bunch for the info, I have 3 of TD and TS motors that will need rings.
    RJ

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