Carb leaks by drain plug

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tim52
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Tractors Owned: 1947 Farmall Cub
1956 Farmall Lo-boy
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Carb leaks by drain plug

Postby tim52 » Thu Feb 25, 2021 12:12 pm

My original carb on my ‘47 (#552) cub leaks by the drain plug. I have tried plumbers tape and other sealing compounds to no avail.

What do you recommendation?

Thanks !

LittleRed1949
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Re: Carb leaks by drain plug

Postby LittleRed1949 » Thu Feb 25, 2021 12:20 pm

Are you 100% sure it is leaking by the drain plug? Sometimes they leak below the choke if the float isn't working correctly.

Otherwise, have you tried Gasoila for sealing the threads?

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tim52
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Tractors Owned: 1947 Farmall Cub
1956 Farmall Lo-boy
Location: Rocklin, California

Re: Carb leaks by drain plug

Postby tim52 » Thu Feb 25, 2021 12:34 pm

Definitely by the plug, I did not know about gasoila

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Re: Carb leaks by drain plug

Postby Bob McCarty » Thu Feb 25, 2021 1:49 pm

There is also the felt plug covered by a convex "washer" that allows excess gas to drain out. I'd verify that it's not from there. If it is, your needle may not be seating due to debris. Does it leak when running or just when you turn it off and park it? The drain plug is pipe thread and should easily seal with PFTE (teflon) tape.
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tim52
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Posts: 39
Joined: Mon Feb 21, 2011 11:45 pm
Zip Code: 95677
Tractors Owned: 1947 Farmall Cub
1956 Farmall Lo-boy
Location: Rocklin, California

Re: Carb leaks by drain plug

Postby tim52 » Thu Feb 25, 2021 2:02 pm

Thank you both , I was in error.

The leak was due to the failed gasket on the carb side with the jet. It was draining down and I just didn’t see it, Just cut a new gasket and the leaks is solved and engine restarted fine after 6 + months of just siting around. These machines are really durable.

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Don McCombs
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Re: Carb leaks by drain plug

Postby Don McCombs » Thu Feb 25, 2021 2:36 pm

Glad you are back in business. It is quite common for the carburetor bowl gasket to dry out and shrink during long periods of non-use. Always a good idea to have a spare gasket on hand.
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tim52
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Joined: Mon Feb 21, 2011 11:45 pm
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Tractors Owned: 1947 Farmall Cub
1956 Farmall Lo-boy
Location: Rocklin, California

Re: Carb leaks by drain plug

Postby tim52 » Thu Feb 25, 2021 4:11 pm

I just needed a small washer for that the carb jet on the side of the carb. A while back I bought a set of punches from 1/2” to 1/16” in 1/16” increments which enables me to cut out small washers from rubber or plastic gasket material as I need them.

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Stanton
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Re: Carb leaks by drain plug

Postby Stanton » Fri Feb 26, 2021 7:31 am

tim52 wrote:I just needed a small washer for that the carb jet on the side of the carb. A while back I bought a set of punches from 1/2” to 1/16” in 1/16” increments which enables me to cut out small washers from rubber or plastic gasket material as I need them.


Good news to hear! I've been cutting my own gaskets for years; punch set and an X-acto knife. No buying and waiting on it to be shipped.

Way to go! :{_}:
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Re: Carb leaks by drain plug

Postby NJ Farmer » Fri Feb 26, 2021 7:32 am

There is a product called E-Z turn (google search) sold at Aircraft Spruce. It is a tread sealant/lubricant made for fuel line connections. I HIGHLY recommend this....also please remember that the carburetor is an aluminum body so please don’t crank down on the plug or you will strip the threads.

NJ Farmer

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Re: Carb leaks by drain plug

Postby Gary Dotson » Fri Feb 26, 2021 8:23 am

I was a little confused, at first, but it was simply the jet gasket, good news, easy fix. Glad you're back in business.

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Re: Carb leaks by drain plug

Postby oldhoe » Wed Mar 10, 2021 6:26 pm

tim52 wrote:I just needed a small washer for that the carb jet on the side of the carb. A while back I bought a set of punches from 1/2” to 1/16” in 1/16” increments which enables me to cut out small washers from rubber or plastic gasket material as I need them.

save empty bullet shells. they come in increments of +_ .001 and you tap em with a hammer and cut perfect holes in gasket material, cereal boxes, prince albert cans, oiled cardboard, etc: lol and they are free and never ending!

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Stanton
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Location: Lone Jack, MO

Re: Carb leaks by drain plug

Postby Stanton » Thu Mar 11, 2021 10:21 am

NJ Farmer wrote:...also please remember that the carburetor is an aluminum body so please don’t crank down on the plug or you will strip the threads.

NJ Farmer


The material of an updraft IH Carb is actually pot-metal, not aluminum. Like aluminum, it is soft and threads are easily stripped when over cranking a wrench. Good advice.
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