Originally Posted by
mr bill
Until a week ago, CHT was always in the middle of the green. A week ago, the temp went up to 120 C, so I landed and drained the coolant. I removed the thermostat and put it in boiling water. It opened like it should, so I installed it and refilled the coolant. This time the temp went to 130 C. I again drained the coolant and again found a sand colored material that had settled out of the coolant (4th time). This time, I found coolant leaks at the overflow bottle and what appears to be the water pump. The coolant tank on top of the engine was dry on the outside. The engine was manufactured in 2007 and has 70 hours on it. I am using the oversize copper radiator from Kitfox Aircraft. Any ideas?
Bill