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TN 27 Lower Unit Gear Ratio

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  • TN 27 Lower Unit Gear Ratio

    So heres my questions, what is the gear ratio on a 1951 TN27, also what is the max RPM this engine can turn.

    Does anyone have a service manual and or an owners manual for this engine, I already have the parts catalog.

    Any help guys would be great, I am working on a propeller project and need the info, and I would like to own the manuals, as I collect old manuals and the like.

    I actually like being a mechanic, its no fun doing it for a living so I got a different job and do the wrenching as a hobby.😀

  • #2
    I don't have any info on the older models, might try https://www.outboardbooks.com/ to see if they have any manuals on it. The gear ratio could be determined by counting prop shaft turns with one turn of drive shaft.
    Regards
    Boats.net
    Johnson Outboard Parts

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