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Radiator Cap

Pressure or Not

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Alan Hoover

01-31-1999 14:22:26

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I have a 1953 Framall Cub Tractor with a Pressure radiator cap ( 7 lb. ). Sometimes, it the radiator blows water out the overflow pipe. Should I use non-pressure cap.

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TMAC

01-31-1999 15:30:42

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Re: Radiator Cap - Pressure or Not in reply to Alan Hoover, 01-31-1999 14:22:26

Alan; check your overflow pipe if it has one. If this Cub has a non-pressurized cooling system, the pipe will be inside the top of the radiator, below the cap. If so it won't matter what type of cap you use because boil-over and pressure is released thru the pipe and not the cap.

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Harold H

01-31-1999 15:22:35

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Re: Radiator Cap - Pressure or Not in reply to Alan Hoover, 01-31-1999 14:22:26

Alan,

I disagree with John D. You should use a non- pressure cap on your Cub. The Cub has a thermosyphen cooling system. This system does not have a water pump and depends on the water boiling in order to circulate the water through the block and radiator for cooling. The fan only draws the air through the radiator to cool the water back down. The system will work with a pressure cap, but the pressure cap raises the temperature at which the water boils and therefore raises the operating temperature of the engine to a higher temperature than the engine was designed to operate at. If you can't find a non-pressure cap to fit I would recommend using a pressure cap of a maximum of 4 psi untill you find a non-pressure cap.

Harold H

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john d.

02-01-1999 06:44:37

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Re: Re: Radiator Cap - Pressure or Not in reply to Harold H, 01-31-1999 15:22:35

Good answer! I stand corrected!

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Jim Becker

02-01-1999 19:51:41

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Re: Re: Re: Radiator Cap - Pressure or Not in reply to john d., 02-01-1999 06:44:37

Time to stand for another correction. The water expands and circulates without boiling. Thermosyphon systems can run and cool all day without boiling.

IH put pressure caps on later Cubs and the final parts book listed ONLY the pressure cap.

As far as I know, ALL Farmall Cs came with a pressure cap and most of them were a thermosyphon system.

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john d.

01-31-1999 14:38:52

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Re: Radiator Cap - Pressure or Not in reply to Alan Hoover, 01-31-1999 14:22:26

Only if you want it to boil sooner. The 7 pound cap (assuming it works correctly) pressurizes the system to RAISE the boiling point of the coolant. Water boils at 212 degrees F. at sea level. The boiling temperature decreases some as you go to higher altitudes. Permanent antifreeze will raise the boiling point according to how much you add. Check the chart on the back of the container to find out how much. If the radiator boils water out, things are either getting too hot, or the radiator is too full. I don't know if these things have a water pump or not, but they do have a fan. If the fan belt is slipping, that could be part of your problem. It's also possible that your tractor's radiator has years and years of accumulated crud in it that keeps it from being as efficient as it should be.

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