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Steve: I'll second the coffee can, doesn't rattle but more importantly it doesn't leak. Most water going down a stack is caused by deflections and one of the worst deflections is a rain cap, held open by the wind. Second would be parking the tractor near a higher object that the tractor, like a building or a tree. The third would be a loose exhaust pipe in the manifold, water runs along the hood and follows the pipe downward. I always use the tin can, preferably one that fits snugly. If you happen to forget, one night rain will not hurt anything, providing none of the above happen. I once left Farmalls 560D and a 300 in the middle of a 100 acre field, nothing over either exhuust, no higher objects within 500'. Over night we had winds and a 9" rainfall. When we started them, they hardly blew black soot. If there is a breeze the tractor itself creates an updraft, causing most water to blow right over the tractor. I've seen a lot more water down my 560 stack when it had a rain cap, and the wind held the cap up for hours deflecting water right down the pipe. Bear in mind I am talking over night, any water even a little bit should not be left in the engine. Stacks should definitely be covered if a tractor is left longer.
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