If you ran it for any more than a few minutes with coolant in the oil you can pretty much bank on the bearings being toast. The only way you can really assess the bearings is to drop the oil pan and remove the caps and look at them. If luck is on your side then the crank won't be scorred but I wouldn't bet on that either. I think you're probably in for a significant tear down on this one... but you need to find out where the coolant got away first so you know how to proceed. If it's not a high hour engine and the block and cylinder walls are fine... and the crank didn't get marked up... then you can probably get away with a complete set of bearings, a set of rings for good measure and a gasket set. If you have a pinholed block then you're looking at boring and sleeving the block... and depending on where the pinhole is... mabey just junking it. Sometimes they leak from the bottom of the water jacket directly into an oil gallery and that's not so easy to repair. If it's a cylinder wall... then you can sleeve all three back to standard and if the pistons are good... reuse them. Or go buy a used engine... but that can be a pig in a poke too...
I wouldn't get too worked up about pushing the tractor. It was made to be pushed. There's more than ample design in it to take everything that engine has to give it, save the radiator. The way I look at it... if you didn't work it so hard that it ran steadily hot and stayed there... you did it no harm. This problem is just one of those sh!thouse bad luck things that happens.... not so much bad luck if it's a cooling system pinhole and you had 10 yr old antifreeze... but still not good luck. Those things require that the coolant be maintained and a conditioner added (DCA4) to the coolant to break the surface tension of the coolant and prevent the cavitation bubbles that lead to the pinholes.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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