Posted by ScottyHOMEy on September 16, 2008 at 10:57:47 from (71.241.213.150):
In Reply to: Farmall A Getting Hot posted by astimpson1 on September 16, 2008 at 09:30:53:
No way to tell safely without removing the grill so you can get your hand on it but it sounds to me like it's working just the way it's supposed to.
Yours is a non-pressurized thermosiphon system and does not (or at least should not) have a thermostat, nor a water pump. Works on the basic principle that heat rises. Your coolant heats up around the cylinder sleeves and in the head. As it heats it rises to the top and passes out the front of the head to the radiator. As it cools in the radiator it falls and re-enters the crankcase at the bottom. The rising in the motor and the falling in the radiator is what creates circulation in the system in the absence of a pump.
If you have a good muffler tightly clamped to the pipe, you'll notice at high RPMs that your fan is actually noisier than your exhaust. I know listening from the house to our BN (same motor) out cultivating that, except when the governor would cause her to belch, you never heard the exhaust. All you heard was the steady roar of the fan.
Point is that the fan is over-efficient for the size motor, which is what gets the thermosiphon circulation going. I've noted the same thing as you, that the top of the radiator will be hot while the bottom will be comfortable to the touch, even after a hard run, and even cool to the touch if she hasn't really been working hard. And that's with a clean, good working system.
Yes, it's different from automobiles, where we're accustomed to the whole system being under pressure and hot every where but, myself, what you describe sounds quite normal for a non-pressurized thermosiphon, so I'm not sure you have a problem.
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