Topic: 1941 Mercury KB-3 Spark Plug Cover Confusion – Page 2

This topic has 23 replies, 6 voices, and was last updated 1 year, 2 months ago by green-thumbs.

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January 25, 2023 at 4:52 pm #271727
Buccaneer
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green-thumbs wrote:

KB-3, KD-3 and KE-3 routed cooling water differently. First year K-1 and K-2 did not have spark plug covers. KE-3 had cowling without spark plug covers.

Spark plug covers have limited space, compact spark plug MA& be required as well as small ignition wire boot.
- This reply was modified 1 year, 3 months ago by green-thumbs.
Of course, all the models had to be different, lol.

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January 25, 2023 at 4:58 pm #271728
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I messed around with the tell – tale, and found a way,
as previous mentioned, to route the plumbing inside of the
spark plug cup, and out the bottom hole.

The may not be “correct”, but it should work, and I didn’t
have to modify the cover.

I went with 1/4″ tubing. Hopefully that size will allow for
adequate water flow to cool the cylinder……. the tell – tale
is the only water “outlet” that I’m aware of.

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January 25, 2023 at 6:04 pm #271746
Boonie
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Hey Buccaneer, yes they are repos. Both the same so I had to do some mods for the water pipe. Little bit of grinding. He also makes the recoil covers for the Johnson Javeline.

That motor was siezed pretty hard. I eventually got it unstuck. Couple replaced pistons and new rings I have 100 lbs on both cylinders. I expect it will go up after I run it.

it did turn out quite nice.
January 27, 2023 at 9:00 pm #271884
fifty20ne
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Lou has some good pics!

Here are some I took A while back from a 1946 Mercury KD-3
January 27, 2023 at 9:12 pm #271891
fifty20ne
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January 27, 2023 at 9:29 pm #271896
fifty20ne
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Tom Thuerwachter or Ferguson poole has reproduction rubber gaskets available.

Ferguson-Poole, Inc. (fergusonpoolemarine.com)

I had to trim mine a little to fit with a sharp X-acto knife.
- This reply was modified 1 year, 2 months ago by fifty20ne.
- This reply was modified 1 year, 2 months ago by fifty20ne.
- This reply was modified 1 year, 2 months ago by fifty20ne.
January 27, 2023 at 11:15 pm #271906
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Good to know about the rubber wedges, Thanks!

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January 28, 2023 at 7:08 am #271914
fifty20ne
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- This reply was modified 1 year, 2 months ago by fifty20ne.
- This reply was modified 1 year, 2 months ago by fifty20ne.
January 28, 2023 at 7:12 am #271919
fifty20ne
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Many thanks to Walt Chute for his research on serial numbers!
January 28, 2023 at 9:35 am #271928
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Fifty20one, Thanks for the photos!
It looks like I got my plumbing about right.
I have to come up with a new terminal and grommet
for the plug wire, and I can see how it works out.

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