These are not modern engines designed to run at 192-208F. The thermostat should be 160F. A very low pressure radiator cap, and unless there is an aftermarket overflow tank, leave 2" of clear space at the top of the radiator for expansion. If you fill it full, it will just dump out 1-2" of coolant each time it's up to temp.
Ethelyn glycol can be added to protect from freezing, but it will not increase the cooling capacity of the water. Temps over 190F should be avoided, and also, cool down after a hot use is a good idea to keep from warping a 60 year old head. Let it idle for a bit after a hard work and let the temps get back down to 160 or so before shutting it off. I usually close the fuel petcock once I'm done, and let the fuel in the line and float empty out for about 2 min, then turn off the key.
The 8x1 tractors are a great strong old beast. My only complait is that few were ordered with power steering. I have a 961 and the power steering makes life on the tractor much nicer.
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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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