Bad head gasket will certainly cause it to overheat, and build pressure in the cooling system. Thermostat cools the engine by closing and allowing the fan blades to cool what is in the radiator until gets hot enough in the engine, opens the thermostat, lets cool antifreeze into the block, sends hot into the radiator, thermostat closes, fans begin the cooling process in the radiator again. Not having a thermostat, or having a bad thermostat will cause overheating as well. Overall, thermostat is perhaps the cheapest piece in the cooling system, and the easiest piece to change, and should be the first item changed. I just did one in my 4520 Deere a couple of months ago. Was out plowing all day, and then out of nowhere, overheated. Changed the thermostat, not a problem since. Thermostats go bad. Running without one, one that is stuck open or closed, or a weak one is not a good idea.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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