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Discussion Starter #1
Does anyone know what a good coolant return temp should be for a JD M? I know operating temp is around 190 and cooling is by thermosiphon.

Thanks

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I'm not sure what the return temp should be, but if you are only at 190* operating temp, that is a very cool running M.
 

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Discussion Starter #3
That temp was from just idling and short run around the yard. Pulling the 2 bottom M2 plow it jumped to about 220. Water was not boiling when we removed the cap.

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