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Discussion Forum
Show Parts for Model:

Farmall C Thermo Siphon Radiator Cap???

Author 
Brian Schmidt

10-07-2002 16:44:06
12.215.48.174



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I know that this question and answer were here before. But I cannot find in the archives.

On a Farmall C with a thermo-siphon cooling system, should the radiator cap be the pressure type or non pressure type? When I talked to the owner of O.E.M. tractor parts at Red Power Roundup this summer, he told me that there were two types. One with a lever that is pressurized and one without that looks like a gas cap but has “WATER” embossed on it. Mine has the lever type on it now and seems to work fine but is missing the gasket around the top and sometimes it steams out the cap and gets all over the paint if I run low on water and it starts getting hot (done this once this summer accidently).

I always thought that the thermo-siphon used a non pressure type to allow the water to flow correctly. Any experts out there with an answer?

Thanks,
Brian Schmidt

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Haas

10-08-2002 13:10:00
166.72.245.110



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 Re: Farmall C Thermo Siphon Radiator Cap??? in reply to Brian Schmidt, 10-07-2002 16:44:06  
As the others said, the purpose of the pressurized cap is to let the system run hotter without losing coolant. I have a C with the thermosyphon system and the pressurized cap. The radiator is different for the pressurized and non pressurized, as is the neck that bolts to the head to which the top radiator hose is connected. Also, the pressure cap will not fit on the non pressurized radiator. The pressurization makes no difference on the operation of the thermosyphon system. Thermosyphon works just as well pressurized as not. Important thing is to have the radiator and the block passages clean.

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JIM

10-08-2002 08:09:05
216.43.103.151



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 Re: Farmall C Thermo Siphon Radiator Cap??? in reply to Brian Schmidt, 10-07-2002 16:44:06  
A pressurized cooling system is to raise the boiling point of the coolant. Most older systems I run, I am not as concerned about the boiling point as I am about not increasing my chances of radiator or cooling system leaks because the systems are old. Therefore, I generally run all my Farmalls either with a pressurized cap cracked a little or a non-pressurized cap.



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JIM

10-08-2002 08:08:54
216.43.103.151



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 Re: Farmall C Thermo Siphon Radiator Cap??? in reply to Brian Schmidt, 10-07-2002 16:44:06  
A pressurized cooling system is to raise the boiling point of the coolant. Most older systems I run, I am not as concerned about the boiling point as I am about not increasing my chances of radiator or cooling system leaks because the systems are old. Therefore, I generally run all my Farmalls either with a pressurized cap cracked a little or a non-pressurized cap.



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randy hall

10-07-2002 17:48:10
208.231.151.54



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 Re: Farmall C Thermo Siphon Radiator Cap??? in reply to Brian Schmidt, 10-07-2002 16:44:06  
the fellow at oem is an expert on old farmalls, why would you doubt him? if you look at both types of caps you would see that a non pressure cap wouldn't fit on your radiator. a lot of john deere's had a pressure system and no water pump. being under pressure has nothing to do with hot water rising and cool water falling. i hope this helps, randy



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CNKS

10-07-2002 19:10:14
207.178.96.211



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 Re: Re: Farmall C Thermo Siphon Radiator Cap??? in reply to randy hall, 10-07-2002 17:48:10  
My C parts book indicates that the radiator had a different part number at SN 58138, but that the system was pressurized earlier at SN 21347, meaning that both caps would fit the older radiator. The original IH pressure caps did not have a lever, but a handle to make them easier to remove. Easy to tap with a hammer while standing away from tractor.



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CNKS

10-07-2002 19:21:24
207.178.96.211



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 Re: Re: Re: Farmall C Thermo Siphon Radiator Cap??? in reply to CNKS, 10-07-2002 19:10:14  
COrrection -- what looked like a cap in the parts manual is actually a gasket. Operators manual says the system was pressuized -- sorry! -- However I don't think the B's and non-super A's were.



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Paul Shuler

10-07-2002 16:52:47
66.119.2.82



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 Re: Farmall C Thermo Siphon Radiator Cap??? in reply to Brian Schmidt, 10-07-2002 16:44:06  
Brian, let me start by saying I am no expert.I have been told the same as you on the caps. I do think however that the cap should make a good seal in order for the thermosiphon system to, for the lack of a better word "suck" the way it should.



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