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Message: <blockquote data-quote="Tigerhaze" data-source="post: 58251" data-attributes="member: 6436"><p>Are you getting any bubbles or air in the radiator over time? I don't know the Kubota engines, but an infamous issue on Honda/Acura engines is what is called a "seeping" head gasket. There will be no water in the oil or vice versa, but one of the cylinders (usually the furthest from the water pump) will leak into the cooling system. The engines will still run well but after a short period of running hard, the engine will overheat because enough combustion gas will displace the coolant and cause the thermostat to close from air locking. You won't necessarily see coolant pushed out of the radiator either. Confirmation can be made by using a test kit on the coolant to check for combustion gasses. It's just another idea, and may be totally irrelevant to the Kubotas but thought I would mention it.</p></blockquote><p></p>