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Farmall & IHC Tractors Discussion Forum
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560 Moisture build-up

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beefalonut

09-24-2005 17:05:46




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My 560 develops moisture on the carburetor after running for an hour or so. It is not gas nor is it anti-freeze from the radiator. The tractor is shedded and not exposed to the rain. The mositure build-up corresponds to a somewhat poorer running engine. Any ideas or suggestions?




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IaGary

09-25-2005 06:05:52




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 Re: 560 Moisture build-up in reply to beefalonut, 09-24-2005 17:05:46  
I've also had this happen many times. I've wedged a tin deflector between frame and carb before on moist cool days to use engine heat to keep frost off carb. Or shut off engine off for a few minutes to thaw. Many times when you restart, motor is warm enough to keep it thawed for rest of day.



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Pale Rider

09-24-2005 22:59:19




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 Re: 560 Moisture build-up in reply to beefalonut, 09-24-2005 17:05:46  
I agree with Captaink except to say that my parents have a Case VAC that will form frost in the area of the venturi at tempuratures well above 40 degrees.



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captaink

09-24-2005 21:13:54




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 Re: 560 Moisture build-up in reply to beefalonut, 09-24-2005 17:05:46  
I’m guessing that you are seeing this on cooler mornings or evenings in humid conditions under light or no-load conditions. If so, what you are seeing is the cooling of the carburetor from the “venturi” effect. As the air passes through the venturi in the carburetor it speeds up, and absorbs heat from the surrounding metal. This lowers the temperature of the carburetor and adjacent intake manifold, which in turn condenses water from the air next to it (similar to a cold beer can on a hot humid day). In severe cases with temperatures below 40 degrees F, frost will form also.

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Janicholson

09-25-2005 08:43:12




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 Re: 560 Moisture build-up in reply to captaink, 09-24-2005 21:13:54  
If there is a need to work the tractor in these conditions, modification can be made, and can be fairly hidden under existing sheetmetal. Make a sheet metal shroud that snugs around the exhaust manafold, but is 1/2 inch away from it. Fasten it well so it doesn't rattle or viabrate. Opening up a 2'3" piece of 2-1/2 " exhaust tubing will do it. With the rear end of the tubing still round run a piece of mid 70's Ford V8 snorkel pre heat tubing over to the vertical part of the air cleaner above the fat part. Put a T into this intake pipe and a butterfly valve in the T. When the valve is open, it closes the manafold heater. When it is closed it draws air from around the manifold.
I realize cutting into the pipe will devalue it.
But running rich will harm the engine, and waste fuel. This technique has been a proven method for more than fifty years on production automobiles. look at auto manuals for plans and butterfly controls.
Just 2 cents JimN

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