Re: Farmall M Radiator

Posted by Janicholson on February 07, 2006 at 12:50:53 from (199.17.6.175):

In Reply to: Re: Farmall M Radiator posted by chadd on February 07, 2006 at 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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