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Wayne: I've forgotten the can many times, but you know, if the exhaust system is in good condition, not much rain will go down that stack over night. You can get noticable water if you have a down draft deflecting water, i.e. tractor parked alongside a higher building. I'll bet those rain caps, if held open by the wind, will deflect more water down a stack than the average building. Another bad spot is a tractor under or near a tree. A tractor in the open field will catch no more water than the average rain gauge, and the most of that will be traped in the mufler. By the way, I once had a 9" rainfall in 12 hours. At startup time the soup can covered stacks blew no black wet soot. The rain cap covered tractors blew as much black wet soot as the tractor with nothing over the stack. The only time I ever got much water in an engine was operator had parked 300 with exhaust pipe loose in the manifold. He didn't realize this at the time. He covered the stack but water ran along the hood and followed the pipe down. One cylinder was full of water and the manifold was full. If you leave them parked for weeks, months, etc., that will be a horse of a different color. Oh yes, I have chased the can a few times, mainly when I blew it in the air at startup time. And Cowman is right, I bent the stack on my 1066, just that way and it happened before the tractor was a week old.
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