The others that have chimed in on this all have good advice to offer.
F-Dean points out my mistake in assuming (always a dangerous thing -- mea culpa) what kind of tractor we're talking about. My listing of parts changes applies only if you have an A, B, BN, or an early C. If older than an A, please disregard and we'll hope somebody with knowledge of the older tractors will chime in.
JimN is spot on about the weaknesses that can be revealed when putting pneumatic pressure on a radiator that isn't designed to hold it, and if you do decide to go ahead, I'd recommend adding a pressure rated radiator to the parts list.
Chadd is also spot on, and his further explanation of the thermosiphon is a good one, worth saving if you're into that. What jumps out there for me is his emphasis on the need for the system being clean to work properly. Is your system actually overheating or are you just thinking you want it to run cooler? It makes a difference. And his final point about running too cool is worth noting. You can sieze an engine running too hot, but it will die an early death running too cool, as well, just not as dramatic.
To Ron's point, I think Hugh and I agree that these 113s (assuming again that's what we're talking about) were built with more than adequate radiator to handle a hot load for some time. On my BN, I judge how hot she's running by how high I can put my hand on the radiator before it's uncomfortable, and that has always been above 1/3 up from the bottom, which says that the combination of tube volume and fin surface and flow are sufficient for the original sytem to do its job under all but abusive conditions.
Hugh may have misunderstood some part of my argument, because I agree with him in thinking that a pump and thermostat are not necessary.
If, after all this advice and any other you've gotten, you want to go ahead with it, I'll be glad help where I can. If you want to stay with what you've got but perhaps flush the system to try to clean it out and see if you can get your thermosiphon to work better, I'll speak up with the other folks that have ideas about the best way to do that without a complete teardown.
Let us know. We're all pullin' for ya, but we're all gropin' just a little bit, too.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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