It could be a head gasket issue OR it could be something cracked (head or block) allowing oil to enter the cooling system (probably when the tractor is running) and coolant into the lubrication system (probably when the tractor is not running). You could of pressure tested the cooling system if you hadn't torn it down, but with the head off you can't. You could have the head checked for flatness and cracks and put it back together and see if you fixed the problem.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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