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Hey MF Poor

H

Hills of TN

Member
Ok, you guys have educated me on the need for a thermostat - it gets rid of moisture and more efficient operating at the proper temperature. Those two I understand. I don"t understand why the lack of a thermostat could make a tractor run hot???
 
Cooling systems work best when flow is controlled. Coolant needs to stay in the radiator long enough to cool down adaquately. Coolant needs to stay in the engine until it reaches operating temp. SOME engines will run cold (cool) with no thermostat. Some run hot. Only a very few benefit any at all with no thermostat, and that's usually only in certain conditions. Also to look at, make certain the radiator CAP is in good condition. Cooling systems operate under pressure. Coolant will tend to boil quicker if pressure is vented prematurely. I've had several trucks/cars/tractors over the years that tended to heat up beyond "normal" range that were fixed with a new (sometimes higher pressure rating) radiator cap.
 
Having a thermostat installed is ESPECIALLY important in certain applications in which the thermostat has a second "plate" or "disc" at it's "bottom" end that moves along with the main part of the thermostat.

In these setups, the disc begins to restrict the bypass cooling passage as soon as it begins to move to open the main cooling passage.

With NO thermostat installed, the coolant always flows in BOTH the bypass cooling circuit AND the main circuit to the radiator, making for less efficient cooling and a hotter-running engine when under load.
 
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