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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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