Here are my thoughts. I have a lot of bitterness toward dealers I might as well tell you that up front. Dad had a Kubota about 25 years ago and he had problems. Dealer would not stand behind there tractor. I have a massey ( everybody accuse me of bashing massey/ agco, but it is what it is) and dealer would not stand behind their tractor or their repairs. I hope you have better luck, but most field reps wiggle and squirm like a snake. They want to blame you for the problem w rather than warrant their tractor. I do really hope you have better luck than me with the field rep. Here is a thought: if radiator was full when you got it from the dealer, it would run pretty good even with a blown head gasket. As you used it you would gradually loose your coolant until it over heated. You may have a blown head gasket when you picked it up from the dealer. I would insist on a new engine from the factory. If they rebuild the engine and their is issues, you back to fighting with the dealer and field rep trying to get the to.warranty the repairs. Been.in that boat too. I wish you the best of luck with you situation.