If original, it is not pressurized. Your tip will be the way the cap fits to the neck. If the lugs to tighten down the cap are on the outside of the neck, then it's pressurized. If on the inside, not.
If the cooling system is otherwise clean (good radiator, water jacket inside motor generally not full of sludge) the non-pressurized, no-water-pump thermosiphon coooing sytem on teh 113 motor was remarkably efficient and trouble-free. Much depends on a clean radiator. The fan is such that it will draw so much air over the radiator that, when working properly, you can shut the motor off after a long, hard-working run and not want to touch the top of the radiator, but find the metal of teh outlet neck at the lower end quite comfortable to the touch.
I've told the story often about listening from the house to our BN out cultivating beans all day. Apart from the occasional belch when the governor would grab hold, you never heard the exhaust -- what you heard was the fan. An amazingly efficient system for its simplicity. Tha tractor would run all day in light or heavy ground and never overheat.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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