6039 Speeditwin Flywheel Keyway

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  • Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 3269
    Topics: 910
    #187185

    I noticed yesterday that the crankshaft key way for the flywheel
    is “wallowed out” rather bad, on the crankshaft and flywheel.
    I happen to have a spare flywheel with a good key way.

    I haven’t had any luck finding another prop shaft yet, so assume
    a hunt for a good crankshaft won’t be any easier.
    That said, what’s your favorite “farmer’s fix” for a wallowed out”
    crankshaft key way?

    Tack-weld a new key in the crank? JB Weld it?
    Don’t believe I’m equipped to machine the key way over-size and use
    a stepped key.

    I haven’t looked for a new key yet, but a .190 wide key fits in the good
    flywheel nicely… nothing in my part bin is the right length or depth though.

    Thanks for your ideas.

    flywheel-hub-1

    flywheel-hub-2

    DSCN8328

    Prepare to be boarded!

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    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 3269
    Topics: 910
    #187204

    Is there a common key for the Speeditwins available?
    The closest I can find in any charts is a # 611,
    witch is 3/16″ wide and 1-1/4″ long.
    The mangled one I removed was 1-3/8″ long.

    I can’t read the Speeditwin parts diagram as to what key it is,
    but looked like……..
    802175, which I get no Internet hits on!

    Prepare to be boarded!

    Avatar
    adekalb

    US Member - 1 Year
    Replies: 5
    Topics: 0
    #187207

    guys, What ever you do to replace the key and fix keyways, be sure to torque the flywheel nut to the specs. Loose or not sufficiently tightened flywheel nut will cause your key problem.
    Does any one have the flywheel torque spec. for the Speeditwin? Water Bug

    David Bartlett
    David Bartlett

    US Member - 1 Year
    Replies: 190
    Topics: 8
    #187209

    Tom,

    My Speeditwin was worse than that. I had to replace the flywheel, but I used my crank as is. Clean the burr’s off the crank and torque it down tight as Art said. I don’t know what the torque value is supposed to be. Probably 2 whacks on a wrench with a big hammer.

    Running them loose is what causes this.

    I had to make a new key from some key stock.

    Have fun!

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 3269
    Topics: 910
    #187213

    Thanks for the replies. Glad to hear you’ve seen worse keyways! One never knows
    what he will find with “bargain” priced outboards, but that’s the fun of it.
    As I searched for ideas, I ran across this product. I was impressed by
    the video, but am afraid the price of said product puts a damper on it.
    It would be nice if they sold it in little tubes for single project uses.

    Prepare to be boarded!

    Tubs
    Tubs

    US Member - 1 Year
    Replies: 2494
    Topics: 149
    #187215

    Key

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    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 3269
    Topics: 910
    #187227

    You win Tubs, lol.

    Prepare to be boarded!

    bobw
    bobw

    US Member - 1 Year
    Replies: 694
    Topics: 30
    #187234

    Tubs- those are some gnarly looking shafts!

    Buc – wonder if the same process shown in the Belzona video couldn’t be done using JB Weld?

    Bob

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

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 3269
    Topics: 910
    #187236

    Tubs- those are some gnarly looking shafts!

    Buc – wonder if the same process shown in the Belzona video couldn’t be done using JB Weld?

    Bob, I’m guessing JB weld would at least help hold the key
    in place and correctly timed initially, but just not sure if JB is
    as good holding up in the long run. Maybe with proper torquing
    of the flywheel, it might last a while. At least it wouldn’t
    cost much to find out.

    Prepare to be boarded!

    RICHARD A. WHITE
    RICHARD A. WHITE

    US Member - 2 Years
    Replies: 1676
    Topics: 131
    #187244

    We just weld the key way then re-machine a new one in the old Rowboat motors, I would guess that would be ok, difference being the old ones only run 1200 or so rpm, those Speeditwins go a fair bit faster..

    http://www.richardsoutboardtools.com

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 3269
    Topics: 910
    #187245

    We just weld the key way then re-machine a new one in the old Rowboat motors, I would guess that would be ok, difference being the old ones only run 1200 or so rpm, those Speeditwins go a fair bit faster..

    If “re-incarnated”, I hope to come back as a machinist with a shop
    full of equipment.

    Prepare to be boarded!

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