Carb Float

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Kenk
Posts: 26
Joined: Sun Oct 16, 2016 6:26 pm
Zip Code: V4R2P6

Carb Float

Postby Kenk » Thu Dec 07, 2017 6:55 pm

Good evening.
With winter arriving I have some time to do some repairs to the 48. The gas drips out the air intake side of the carb when idling So thinking the float is sticking or out of adjustment. One problem have a look at my float pictures. Is this the a correct float? If so what are the adjustment measurements please?
Thanks for your help
Ken
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Ken K
Maple Ridge and Cawston BC Canada
1948 FCUB #56087
1943 Farmall A FAA78723
2008 JD 3620
Our tractors work for a living!
Red Barn Plants & Produce

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Steve Butram
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Re: Carb Float

Postby Steve Butram » Thu Dec 07, 2017 7:00 pm

Never seen a float like that in any of the Cub Carbs I have worked on.
Be prepared to be unprepared Seth Goden

Bob McCarty
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Re: Carb Float

Postby Bob McCarty » Thu Dec 07, 2017 7:12 pm

Image

This is what it should look like. TM Tractor has them.
Edit: Without the gasket in place, the float height is 1.4", float drop is 1.6". I think TM ships to Canada if you don't have a local source.
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we need to think differently."
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Kenk
Posts: 26
Joined: Sun Oct 16, 2016 6:26 pm
Zip Code: V4R2P6

Re: Carb Float

Postby Kenk » Thu Dec 07, 2017 7:21 pm

Thanks for the input. Looks like I will order a replacement plus a few pto parts and get them shipped to the border to pick up in Washington state. In Canada parts can be 2 to 10 times the USA price. Thanks again. Ken
Ken K
Maple Ridge and Cawston BC Canada
1948 FCUB #56087
1943 Farmall A FAA78723
2008 JD 3620
Our tractors work for a living!
Red Barn Plants & Produce

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Glen
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Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
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Re: Carb Float

Postby Glen » Thu Dec 07, 2017 7:34 pm

Hi,
The float is different than the Cub parts manual, and TM Tractor show. I would replace it with a new float. Bob posted a pic of the float above.
Below is the listing at TM Tractor for a new float.

http://www.tmtractor.com/new/fl/655fp.htm

Here is info about working on the IH carburetor, if you need it. Setting the float height is below. It is important to set it to the right height.

Below is a page from the Cub parts manual showing the IH carburetor.

Pull the 2 halves straight apart, don't twist it. The idle tube, number 10 in the pic is easy to break. It screws into the top half.

I would use carburetor cleaner in it, and then blow out all the passages with air. Wear your safety goggles when using the air.

Be sure to remove the high speed jet, number 28 in the pic, and clean it, including the small hole in the end of it.

Check the throttle shaft, number 2 in the pic, and the choke shaft, number 29 in the pic, for side to side wear, there should be no play, but they should turn easily, except for the choke shaft friction spring, number 15 in the pic, making friction, to hold the choke shaft in different positions.

There is a small screen in the gas inlet to the carb, clean it too.

The needle and seat could be worn out and need replacing, if gas drips on the ground when the Cub is sitting. But they can drip because the float level is too high, or because there is dirt in the needle and seat.

http://www.farmallcub.info/manuals/cub_ ... 012-12.jpg

http://www.farmallcub.info/manuals/cub_ ... 012-13.jpg

The original needle and seat were all metal. Some of the guys on here say they work better than other types. Here is a listing at TM Tractor showing how they looked.

http://www.tmtractor.com/new/fl/5183fp.htm

Set the float level accurately with a measure, some of the guys on here have said their carb would not work right until they set the level exactly.
Below is a page from the Cub service manual showing the float level, and float drop, both need setting. The IH Carb is in the upper pics, use those measurements, if you have an IH carb. Turn the top half with the float in place upside down, like the Zenith pic at the lower right, and measure the level.
The IH carb does not use the gasket in place to measure the level, the Zenith does, they are different in that way.

http://www.farmallcub.info/manuals/gss- ... 002-09.jpg

You can read the Fuel section in the Cub service manual, it has lots of info. It is section 2.
There is only an exploded pic of a Zenith carburetor in the section.

http://www.farmallcub.info/galleries/ci ... actors.asp

Tighten everything gently in or attaching to the carb, the metal is soft, and the threads can strip out if you tighten things too much. :)
Last edited by Glen on Sat Dec 09, 2017 6:42 pm, edited 3 times in total.

Kenk
Posts: 26
Joined: Sun Oct 16, 2016 6:26 pm
Zip Code: V4R2P6

Re: Carb Float

Postby Kenk » Thu Dec 07, 2017 7:49 pm

Great info Glen. Thank you
Ken K
Maple Ridge and Cawston BC Canada
1948 FCUB #56087
1943 Farmall A FAA78723
2008 JD 3620
Our tractors work for a living!
Red Barn Plants & Produce

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John *.?-!.* cub owner
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Re: Carb Float

Postby John *.?-!.* cub owner » Fri Dec 08, 2017 12:56 pm

You also will need a new float valve.
If you are not part of the solution,
you are part of the problem!!!

Kenk
Posts: 26
Joined: Sun Oct 16, 2016 6:26 pm
Zip Code: V4R2P6

Re: Carb Float

Postby Kenk » Fri Dec 08, 2017 8:20 pm

I put a new gasket and Vivek in 6 months ago not knowing the float was an imposter. I will be buying a complete kit.

Ken
Ken K
Maple Ridge and Cawston BC Canada
1948 FCUB #56087
1943 Farmall A FAA78723
2008 JD 3620
Our tractors work for a living!
Red Barn Plants & Produce

jsfarmall
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Re: Carb Float

Postby jsfarmall » Sat Dec 09, 2017 10:38 am

Not a bad idea. Mine got to where it was doing the same.thjng and just recently changed it. Runs much better but slightly more cold.natured. have to let it warm up a little longer but that's ok. If I was a 48 model I would get started a little slower too.


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