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Farmall & IHC Tractors Discussion Forum

Farmall M Radiator

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Russell S.

02-07-2006 10:17:08

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Does anybody know what type radiator belongs on an M Farmall. How do you tell if it is pressure or non-pressure? I have found a pressure type but I don"t know if it is the right one for the year tractor.

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RustyFarmall

02-07-2006 11:17:10

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Re: Farmall M Radiator in reply to Russell S., 02-07-2006 10:17:08

The early Ms had the non-pressurized radiator. When the newer Ms with the pressurized radiator came out, the older style was made obsolete, so even if the original rad. was the non presure variety, if it needed replaced, it would have been the newer style.

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El Toro

02-07-2006 10:31:35

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Re: Farmall M Radiator in reply to Russell S., 02-07-2006 10:17:08

Did the old radiator have a pressure cap? My IH
manual says only the early M's had the non pressure radiator, but it doesn't give SN change.
Hal

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Russell S.

02-07-2006 10:38:26

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Re: Farmall M Radiator in reply to El Toro, 02-07-2006 10:31:35

The cap was missing and the radiator is completely rotted. If I buy a pressure type I will have to get pressure type gauges to right?

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Nat 2

02-07-2006 11:34:52

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Re: Farmall M Radiator in reply to Russell S., 02-07-2006 10:38:26

What the h-e-double-hockey-sticks are you talking about, pressure gauges?

There's only one gauge that has anything to do with the coolant, the engine temperature gauge. That only measures temperature, not pressure, and it doesn't care.

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Dave Slater

02-07-2006 15:13:39

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Re: Farmall M Radiator in reply to Nat 2, 02-07-2006 11:34:52

Don't know how much differance there is in temperature gauges but parts books say when changing from non pressure to pressure type the temperature gauge is sopposed to be changed to another part #.As to telling which radiator you have. If the gas cap will fit neck,its non pressurerized.

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jal-SD

02-07-2006 10:59:48

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Re: Farmall M Radiator in reply to Russell S., 02-07-2006 10:38:26

Early H's & M's had the non-pressure type. Later ones had pressure types. No difference in guages. Find a good one @ the nearest salvage yard for an M & put it on. Make sure you adjust it so the sterring shaft goes through the center of the hole in the radiator and you should be good to go. We used to use folded up scrap inner tube ruber on the bottom of H radiators to get the height right, you'll need something like that to prevent metal-to-metal contact on the bottom. There is some r to l adjustment in the mounting holes on the front bolster. (My $0.02 worth. jal-SD)

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Janicholson

02-07-2006 10:54:28

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Re: Farmall M Radiator in reply to Russell S., 02-07-2006 10:38:26

The gauges do not know or care about pressure.
The pressure type cap uses the standard external radiator fastening ridge and camming action, the non pressure use a much larger cap with a different locking system.
JimN

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chadd

02-07-2006 12:22:10

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Re: Farmall M Radiator in reply to Janicholson, 02-07-2006 10:54:28

I always wondered the same thing. The gauge wouldn't care about pressure, but the coolant would, wouldn't it? The reason you pressurize coolant is to allow the same amount of water to absorb more heat without boiling, making it more efficient.(correct me if I am wrong here) If you have a non-pressurized radiator (technically it is a low pressure radiator as it has about 3 or 4 pounds of pressure), wouldn't the gauge need to be set to a lower temperature range? If you add 15# of pressure to the coolant, the boiling point raises up to 45 degrees above that of non-pressurized coolant (50/50 ethylene glycol has a boiling pt of about 223 deg.F at air press) Therefore, wouldn't the hot line on the gauge need to move? These are just my thoughts, not fact, so if I am wrong, let me know.

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Janicholson

02-07-2006 12:50:53

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Re: Farmall M Radiator in reply to chadd, 02-07-2006 12:22:10

The pressure cap radiator has only 6psi pressure. boiling point is raised about 4 degrees F. for every pound of pressure. So the pressure radiator would be able to keep the tractor from boiling even as high as 236 Deg. However the tractor should have a thermostat in it to maintain temperature. This temp will be about 180 to 190 degrees F. In either case the gauge should read the same when the engine is operating in a normal range, and show hot when in the area above ~200. Which either gauge should do.
The non pressure cap is atmospheric. It is only a cover for trash. There is no pressure in the radiator (above atmospheric pressure). Thus the heated coolant can evaporate and the level can change as a result (this often happens when the tractor is shut off and the flow stops). The pressure cap then keeps the coolant from evaporating.
I hope this helps.
JimN

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kfox

02-07-2006 12:49:19

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Re: Farmall M Radiator in reply to chadd, 02-07-2006 12:22:10

I don't know about the technical part. but I read somewhere (parts book, I think) that if you install a pressure type radiator, you need to install a different part # temp gauge.
ken

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NDS

02-07-2006 14:38:57

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Re: Farmall M Radiator in reply to kfox, 02-07-2006 12:49:19

I do not claim to know anything about this subject but this is what IH M parts book says.

part 49 040 DB Heat Indicator (work range 170 to 2oo for tractors equiped with conventional type radiator only) FBK 501 to 60244.

part 67 135 D Heat Indicator (work range 170 to 220 for tractors equipped with pressure type radiator) FBK 60245 up.

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