Where can I get a BIG welch plug?

[kevinrude]

I had to knock a big (11/16" or 3/4") welch plug out of the exhaust can of my 1936 Johnson 300 because it was full of carbon and not exhausting properly (and keeping the motor hot!). I sprayed the inside with oven cleaner then rinsed it out at my local coin-op car wash. i wouldn’t eat off of it, but it looks to be clean enough now. Anyway, any idea where to get a new welch plug of that size?

Also, how do I put it back in? I was thinking of just hitting it with an appropriately sized socket, but what kind of sealant do I need?

Interesting note: when I knocked out the old welch plug, about a thimble full of sand came out with it — i assume this is from the casting — kinda cool after 80+ years.

Thanks guys.

[david-bartlett]

Kevin,

This could be an option.
https://www.mcmaster.com/#9563k151/=1c0l8a5

[theodore]

Any "old time" auto parts, like a NAPA would have something like that. Graduated sizes every 1/16 (or finer) of an inch. Brass or steel, shallow or deep. Drive in with a little sealer, and a socket.

[PugetSoundBoater]

quote david bartlett:

Kevin,

This could be an option.
https://www.mcmaster.com/#9563k151/=1c0l8a5

This McMaster Carr option gives you 10 chances to get it installed right. 😀

"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson

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