Farmall 560 with yellow block, carb 534932R91

I have a 560 with a yellow painted block. No numbers, the SN for the tractor is cys to indicate an LP. It's gas with a 534932R91 Carb. Runs fine 'til I go to high load, dyno or work in the field. It will run at 70HP for 40 secs and then dies like it's out of gas. Checked the tank for rust, did a flow check, assume the needle valve is too small. The Carb Number can't be found by IHC, Case, or the industral side of the IHC line. I assume it's a 715 combine engine, or maybe a 606 CI industrial. I even used a clear tube out of the drain plug to monitor the level inside the bawl. When it goes to high load, it even sucks the gas out of the clear tubing. Where and how did you get a larger needle valve? Not knowing the carb number IHC won't help, you know they need a number or they can't do their job. I've tryed a fuel pump with no change. I'm out of tricks, I need new ideas, My act isn't working.
David

(quoted from post at 06:43:09 03/02/11) I have a 560 with a yellow painted block. No numbers, the SN for the tractor is cys to indicate an LP. It's gas with a 534932R91 Carb. Runs fine 'til I go to high load, dyno or work in the field. It will run at 70HP for 40 secs and then dies like it's out of gas. Checked the tank for rust, did a flow check, assume the needle valve is too small. The Carb Number can't be found by IHC, Case, or the industral side of the IHC line. I assume it's a 715 combine engine, or maybe a 606 CI industrial. I even used a clear tube out of the drain plug to monitor the level inside the bawl. When it goes to high load, it even sucks the gas out of the clear tubing. Where and how did you get a larger needle valve? Not knowing the carb number IHC won't help, you know they need a number or they can't do their job. I've tryed a fuel pump with no change. I'm out of tricks, I need new ideas, My act isn't working.
David

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Have you looked at the filtering screen in the fuel inlet fitting? Is it completely clean and free of rust or other crud?

YES

(quoted from post at 07:22:07 03/02/11) YES

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You might need to go to a 3/8" fuel line and drill out the center of the fuel inlet fitting. I've seen a float valve that was more of a ball check type rather than a needle valve, and that ball check type will definitely flow more fuel, but I don't have a lead on where to get one.

David, I've got a 2606 with a replacement engine. I don't have my stuff handy but your carb number sounds familiar. My carb number didn't show up at the case dealer. It is a 1 3/8" intake throat carb that doesn't show up for any of those models although the IH manual mentions one for a 560. What size throat is yours?

I assume you are looking for a larger float needle and seat as opposed to your main jet. Go to caseih.com and do a search for parts. Start looking for at the gas internationals and farmall from 606, 656, 706 and so on till you can find a bigger needle and seat. Then go to dealer to look for one since they are lost without a part number. Have a few numbers and maybe some fishing line or something to compare the throats of the seats. They are cheap, maybe you can drill one out a little without messing up the seat taper for the needle.

First, I'd do a flow test from your gas line till you have filled up a 5 gallon can. You could have an obstruction in your sediment bowl valve or thereabouts.

I've done a flow test, 7.5 gallons per hour. Can a person ask for a larger float needle valve? They don't show this carb, so without a selection and a feeler gauge it's hopeless. Thought someone may have heard of the carb. Maybe I'm the only one in the world with this carb.
Thanks for your help
David

(quoted from post at 10:49:48 03/02/11) I've done a flow test, 7.5 gallons per hour. Can a person ask for a larger float needle valve? They don't show this carb, so without a selection and a feeler gauge it's hopeless. Thought someone may have heard of the carb. Maybe I'm the only one in the world with this carb.
Thanks for your help
David

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Is that 7.5 gallons per hour THROUGH the carb, or through the fuel line BEFORE it gets to the carb?

have you tried it with the gas cap off?

You could drill the seat out slightly with some numbered drill bits. I am skeptical about that being the root of the problem though.

(quoted from post at 12:37:14 03/02/11) have you tried it with the gas cap off?

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You just might be on to something there Randy.

7.5 gallons per hour may be problem. I can drain the tank on mine and fill a 5 gallon jug in 5 to 10 minutes depending on if I drain off the 3/8" line coming from the tank or the 1/4" steel line going from the sediment bowl to the carb. Your fuel tank outlet or sediment bowl may be partially rusted up.

I'd remove everything from the tank. Then let us know. Your problem really sounds like a gas flow problem from the tank to the carb and not a needle and seat issue.

As for needle and seats, you just have to do a pars search on caseih.com for model tractors and combines that may have a larger carb. Then take those numbers to the dealer and measure them. They may not stock much which is hit or miss.

Through the carb

(quoted from post at 14:36:36 03/02/11) Through the carb

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I'm wondering about the carburetor float settings. I'll guess that the float level is close to being right, but there is a small tab on that float that lets you adjust how much the float will drop, and if that tab is set too tight, the float will not drop enough to allow a full flow of fuel through the needle valve.

One other disappointing bit of info: AFAIK all IH carburetors use the same needle and seat... There is no such thing as a "bigger" one.

(quoted from post at 06:28:08 03/03/11) One other disappointing bit of info: AFAIK all IH carburetors use the same needle and seat... There is no such thing as a "bigger" one.

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Exactly!! That is why I think something else is at issue here.

David, how many turns to you have the run jet needle turned out? Should be at least 5 for full flow but try a couple more and then pull the throttle wide open.

The way I see it is that if you have a problem in the carb, it will stall and die after you try pulling the throttle wide open once or after a number of tries. However if you can rev the engine up and down without problem until your 40 minutes or so is passed, then you have a fuel tank/line issue restricting flow. Sometimes floaters in tank will do that.

Let us know.