The D-361 engine has several cooling nozzles in the cyl head and they require pressure buildup in the crankcase and head to circulate the coolant the way it was intended. Taking the thermostat out does not cause the coolant to go through radiator so fast it can't cool, it upsets the pressure balance all through the engine disrupting the flow in critical places that then therefore become over heated. All engines are designed that way but I think that D-361 is more critical in my opinion. With a thermosyphon system the holes are very large through out the whole engine, including head gaskets, that is why you need to change head gaskets if adding a water pump to engines that did not have one. Also, if you notice on the 400 series engine how little room between the outside of that cyl liner to the block for coolant. It is all balanced out with the proper sized holes in block to send a controlled supply of coolant through that critical area for rapid heat dispersal and or retention for even operating temp through out the block.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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