1940 Mercury K4 Eisemann 72H

This topic has 6 replies, 6 voices, and was last updated 5 years, 2 months ago by green-thumbs.

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August 5, 2017 at 2:42 pm #7832
green-thumbs
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Trial assembly of "Not a Kiekhafer…" K 4 project from parts, reveals a problem. The magneto plate is a way too floppy fit on the "snout" of the crankcase even with the friction adjustment
screwed all the way in. Manual indicates Eisemann 72H is correct magneto and I have
tried two magneto plates so problem seems to be the "snout" on crankcase is too small.
My first thought is to have a sleeve fitted to snout to allow use of magneto plate.
Does this seem like a good solution? I am undecided as to whether original setup had
an adapter or if the "snout" was altered post factory.
Louis

by the numbers:1940 twin snout is about 22mm high and 31.8mm diameter

WF4 twin snout is about 19mm high and 34.8mm diameter

3mm = roughly 1/8" Although K4 snout is a tad rough it is not
that much smaller due to wear. Either it is close to what it was
originally or it has been altered. A solvable problem but not
an expected one.
August 5, 2017 at 5:48 pm #62620
Anonymous
Hey Louis, sounds like an interesting project you have going there. Is it a K4 crankcase that you have? I wouldn’t think that someone would have altered it but I suppose anything is possible. You mention a WF4. Are some of the parts from that model?
Kirk

Oh yeah, any pictures?
August 5, 2017 at 10:49 pm #62625
fifty20ne
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Posting pics for Green thumbs K4 on left WG-4 on right.

https://goo.gl/photos/NYuhxx8BWv6SHaD77
January 28, 2019 at 5:18 pm #165216
benji41
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fifty20ne— What year is the K4 manual? I have a 1940 and does not look the same. Also do you have the complete manual and is there a way I can get a copy?

Jim Benjamin
January 29, 2019 at 5:57 am #165262
billw
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US Member - 2 Years
I haven’t finished my coffee yet, so no guarantees; but seems like this would take up the slack just about right…..You’d need a grounding wire, though. You’d also need to modify the height of the bushing.

https://www.mcmaster.com/1281n31

If that link didn’t work, try this and look for the 1 -1/4″ shaft size

https://www.mcmaster.com/plastic-bushings

Long live American manufacturing!
- This reply was modified 5 years, 2 months ago by billw.
- This reply was modified 5 years, 2 months ago by billw.
January 29, 2019 at 5:42 pm #165316
jeff-register
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US Member - 2 Years
Louis
How about some brass shim stock? ,
Used those nylon bushings in Steris brand surgery tables in the back-up & leg up hinged points. They wore out in 20 years, but moved very slow. Could use counter sunk hardware too, maybe? Is the neck egg shaped?
February 2, 2019 at 3:07 pm #165791
green-thumbs
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US Member - 2 Years
As it worked out, the fellow who gave me the crankcase, dug up the rope plate, flywheel and magneto plate with cam/spark advance handle. Eisemann 72H magneto plate that was a snug fit to the k4 snout. Rope plate was for a Mercury
K4, interesting as I now have 3 K4 rope plates. The tank is for a rewind twin. A non
rewind tank has come to hand and will be swapped in as the rewind tank has
a motor looking for it as well as the large opening magneto plate.
The unknown crankcase led to a very interesting restoration/recreation project.
Some will call it a mishmash. Let them come up with the correct 1940 parts
That might take a while.
K4 is still a work in progress…the gift that keeps on giving .
Louis
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