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I have owned 70, 720 and 730 Diesels, and on those or any diesel for that matter, pressurizeation inside the cooling system would cause me to be leary unless I knew excactly what else, besides head gasket leaks or cracked blocks or heads may be causing it. If a head gasket has developed a leak and that's the cause of what you observed, it (the gasket) may already be damaged to the point no amount of simply retorqueing it is gonna help. Also, even if it hadnt had the normal time to warm up, any escape of hot gasses into the cooling system can cause rapid temp increases. If you check the oil how does it look?? Is it gray or milky looking (water) ??? Does the coolant appear to be water and antifreze or appear to also have some oil mixed in??? When cool, is the coolant level where it should be?? If you have her full of coolant and start it up cool, do air bubbles begin to develop right away even while shes real cool yet??? (((((IF SO, I would be even more afraid of it, becasue thats not so much a heat problem, its combustion chamber pressure leaking into the cooling passages)))) If there are other causes of such rapid overheating (which may be possible) it may not necessarily be a gasket or head or block problem, but unless I was sure of that, I wouldnt be paying too much too quick for the tractor. Let us know, ol John T
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