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 - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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