Is there a coolant bypass around the stat on that engine? It maybe allowing enough cold rad water into the engine to keep the coolant tamps down. You have verified a fact that many folk can't get through their heads. Somewhere out there the idea was formed. "If too hot and boiling over is bad, then cooler is better". Hence all the machines that have had the stats tossed in the garbage bin. 160F stats installed or the shutters missing/jammed wide open. 180F is the minimum operating temp. Below 185F cylinder wall wear, ring wear and cylinder wall lube washdown with raw fuel. All problems increase exponentially was the temps drop. Nobody seems to think about all the rad boil overs from the 1910's into the 1970's with 180F stats. Now vehicles run with 195F stats and the cooling fans don't even switch on until 200F+. When was the last time a 1980's or later vehicle was seen over heated?
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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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