dennis: Like Dean, I'm a bit curious which model your talking about. While I agree that Scotty and Chadd have done a fine job of explaining the thermosyphon system and the merrits of changing to a water pump, however each year many tractors get changed to water pump, when it has been completely unnecessary.
The tractor I'm most familiar with is the Farmall Super A. My Super A is 57 years old and the complete system is still intact with all the same components it came from the factory with, excepting the head gasket, it was replaced in 1994. A great many of these have been changed to water pump as a result of an operator working the tractor for several hours, shutting it of immediately and hot. Then they hear the cooling system bubbling and gurgling, and think the tractor had been operating much too hot. My tractor, if shut off hot will do that today, and it also did it 57 years ago, as did every one of them when new.
If one allows my tractor to idle for 2-3 min after a hard days work, they will never hear a bubble or gurgle from the cooling system when shutt off. They were all that way when new, and a great many of them still operate that way today. Truth is most of these old tractors, thermosyphon or water pump, require that cool down period after a days work. Most folks who have lived most of their lives with pickups and cars, will say, "We never did that back then nor do we do it today, WHY." On the contrary most cars and pickups do get cooling as the last mile or so of most trips is at 30 mph or there abouts.
If your hearing what I describe, don't be hasty about changing to water pump. If your seeing steam being expelled during operation, there is a strong chance the head gasket is bad, head is cracked, or in other words a leak in the system. Just be sure your not trying to cure a leak with a water pump, it wont work.
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