1947 carb.

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zebzeb
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Zip Code: 29927

1947 carb.

Postby zebzeb » Sun May 28, 2017 7:22 pm

My 1947 cubs, carb. leaks real bad. Should i rebuild myself or buy new? What do you think?

Bob McCarty
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Re: 1947 carb.

Postby Bob McCarty » Sun May 28, 2017 7:27 pm

Much cheaper to rebuild it or have someone do that. If it's leaking where the halves join together, the top is likely warped and the gasket is bad. When you separate the two halves, pull them straight apart or you'll break off the idle tube. If there is debris in the needle valve seat, that could also cause leaking.
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Glen
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Re: 1947 carb.

Postby Glen » Sun May 28, 2017 9:07 pm

Hi,
Here is a post where I wrote 3 posts about the IH carburetor, it has info about rebuilding it.
They can drip on the ground when sitting from dirt in the needle and seat, like Bob wrote above, or the needle and seat wears out after years of use, and needs replacing, or the float level can be too high, or more than one of those. :)

viewtopic.php?f=1&t=96200

zebzeb
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Re: 1947 carb.

Postby zebzeb » Tue May 30, 2017 7:24 pm

Hi, Glen Do you know where the sn. is located on the 1947 IH carb?

Bob McCarty
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Re: 1947 carb.

Postby Bob McCarty » Tue May 30, 2017 7:39 pm

It's on the flat surface of the top above the float bowl. They are often obliterated if someone bangs on the top to try and loosen a stuck float. It will be a part #.

Bob
"We don't need to think more,
we need to think differently."
-Albert Einstein

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Glen
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Re: 1947 carb.

Postby Glen » Tue May 30, 2017 7:48 pm

Hi,
The Cub IH carburetors had a part number stamped on the top, on the edge of the bowl. It is easy to see it, if it is there.
I think I have read on here that replacement carbs have no number there.
If you are buying a rebuild kit, I don't know if the place you are buying it would ask for the number. :)
Last edited by Glen on Wed May 31, 2017 12:04 am, edited 1 time in total.

zebzeb
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Re: 1947 carb.

Postby zebzeb » Tue May 30, 2017 8:15 pm

Thinks, looks like there are 2 or 3 rebuild kits for it. According to the old owner it has never been rebuilt. It has the IH on the side of the bowl.

Bob McCarty
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Location: CO, Longmont

Re: 1947 carb.

Postby Bob McCarty » Tue May 30, 2017 9:07 pm

Before you buy a full kit, I'd suggest opening it up and taking a look. You may only need to flatten the top and replace the body gasket. As I said before, be careful you don't break off the idle tube.
"We don't need to think more,
we need to think differently."
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Re: 1947 carb.

Postby staninlowerAL » Tue May 30, 2017 9:30 pm

If you can bring your carb to Cub-o-lina Cubfest you can probably get it fixed up and have an enjoyable weekend. Sanford, NC. June 16, 17th. viewtopic.php?f=8&t=92315

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Re: 1947 carb.

Postby inairam » Wed May 31, 2017 6:10 am

If there were not modification to the engine on the '47 the carb should be a IH 251234R94

Last year I put an IH 364579R91 on my mostly original 1949 and it was not happy running very rich. The same 364579R91 on a later cub ran fine and a 251234R94 on the '49 ran fine. Both carbs were freshly rebuilt by Mike Finch in MI and had main jets and idle tubes correct for the part numbers.

That is just my experience and I do not know if your setup is the same.
When you only have 9 horsepower you need to know the names of all of the ponies!


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