Topic: 6039 Speeditwin Flywheel Keyway – Antique Outboard Motor Club,Inc

This topic has 10 replies, 6 voices, and was last updated 4 years, 5 months ago by Buccaneer.

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November 14, 2019 at 5:24 pm #187185
Buccaneer
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US Member
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.

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November 14, 2019 at 8:39 pm #187204
Buccaneer
Participant
US Member
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!

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November 15, 2019 at 8:45 am #187207
adekalb
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US Member
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
November 15, 2019 at 9:23 am #187209
David Bartlett
Participant
US Member - 2 Years
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!

David Bartlett
Pine Tree Boating Club Chapter

"I don't fully understand everything I know!"
- This reply was modified 4 years, 5 months ago by David Bartlett.
November 15, 2019 at 9:46 am #187213
Buccaneer
Participant
US Member
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.
https://youtu.be/UUwMhU1ZBBM

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November 15, 2019 at 10:37 am #187215
The Boat House
Participant
.
- This reply was modified 4 years, 5 months ago by The Boat House.
- This reply was modified 3 years, 2 months ago by The Boat House.
November 15, 2019 at 12:18 pm #187227
Buccaneer
Participant
US Member
You win Tubs, lol.

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November 15, 2019 at 2:39 pm #187234
bobw
Participant
US Member
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

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
November 15, 2019 at 6:06 pm #187236
Buccaneer
Participant
US Member
bobw wrote:

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.

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November 16, 2019 at 7:48 am #187244
RICHARD A. WHITE
Participant
Lifetime Member
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
classicomctools@gmail.com
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