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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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