Disassembling an early Johnson gear foot?

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  • davidk

    US Member - 2 Years
    Replies: 425
    Topics: 180
    #250707

    Any guidance on how a Johnson Model A gear foot comes apart (and goes back together?

    IMG_6108


    The Boat House


    Replies: 3671
    Topics: 93
    #250710



    Most is obvious except –
    1-Take out the prop shaft.
    2-Turn the prop shaft gear so teeth are up
    and it will slide under the drive shaft gear.
    3-You have the slide this spring cover out
    of the way (big PITA!!!) to get the pin out
    to remove the drive shaft gear & driveshaft.
    Tubs


    davidk

    US Member - 2 Years
    Replies: 425
    Topics: 180
    #250711

    oh, so the prop shaft should be able to be pulled from the gear? I expected that to be pinned and I couldn’t figure out how to get past the drive shaft pinion.

    Water pump should be able to pul from the gear foot housing when the set pin is removed?
    Thans Tubs!
    -David


    The Boat House


    Replies: 3671
    Topics: 93
    #250727



    The piston of the pump runs on the cam on
    the back of the gear so remove it first. Only thing
    holding it in is the set screw with the lock
    nut. They are usually tight and you have to
    wiggle the pump to get them out.
    The gear is keyed to the prop shaft.
    Tubs


    davidk

    US Member - 2 Years
    Replies: 425
    Topics: 180
    #250734

    I wrestled with that prop shaft all day and couldn’t get it to relent. It was dry in there so maybe there’s corrosion? I’m soaking it in PB Blaster now. Someone, in the last 97 years, took the time to clean out the grease from the gear case and never refilled it. As a friend of mine likes to say “The enemy has been in here.”

    Thanks, Tubs, for the guidance and for the parts display. Very helpful. -DK


    davidk

    US Member - 2 Years
    Replies: 425
    Topics: 180
    #250873

    Well, got it apart finally. Easy to see why it wasn’t parting easily. What a difference between these two lower units! The corroded cam chewed down the water pump piston. The last few runs of this motor might have been short with some rowing back to dock.

    IMG_6123

    IMG_6125

    IMG_6126

    IMG_6127


    Buccaneer

    US Member - 1 Year
    Replies: 5333
    Topics: 851
    #250879

    Looks like that one struggle to stay alive until it’s last breath!

    Prepare to be boarded!


    The Boat House


    Replies: 3671
    Topics: 93
    #250880



    Its a testament to those old Johnson’s. You
    would think it would have quit running long
    before it got to that point. Its not that uncommon
    to find gear cases in that condition in motors
    that don’t have seals. What frustrates me even
    more than opening up one and finding that is
    one with a really nice set of gears. Except for
    a few teeth at the bottom of the prop shaft gear,
    that are mostly gone, from sitting in water for
    decades, because they didn’t bother to drain the
    gear case the last time they used it. How did
    you like the spring cover on the drive shaft gear Dave?
    Tubs


    bobw

    US Member - 1 Year
    Replies: 1674
    Topics: 49
    #250881

    Sometimes it’s amazing what you’ll find when you open up one of these old motors!

    Bob

    1937 Champion D2C Deluxe Lite Twin
    1954 Johnson CD-11
    1957 Evinrude Fastwin 18
    1958 Johnson QD-19
    1959 Johnson QD-20

    “Every 20 minute job is only a broken bolt away from a 3-day project.”


    davidk

    US Member - 2 Years
    Replies: 425
    Topics: 180
    #250888

    That spring cover was no picnic Tubs! I marvel at the engineering of these old Johnsons but that spring cover is the kind of cruelty I usually find only in Mercurys.

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