Gentleman Farmer: The problem you speak of had nothing to do with damage to engine or the fact the engine was thermosyphon. The problem was non pressurized system and the alcohol would evaporate from older antifreezes. Once the alcohol evaporated you no longer had antifreeze. It may still do that to some degree, however I think improvements in newer antifreezes have helped the problem. Indirectly I suppose it was damage to engine, as the alcohol evaporated, one no longer had antifreeze, thus the reason we see so many SA with cracked block repairs behind the carb.
Your 1954 Super A would not fall in the above catergory, as all Super A tractors after serial number 336711 in mid 1953 had factory pressurized radiators. You still need to premix the solution.
It may still be a problem in non pressurized, as I do hear folks commenting about adding antifreeze to bring the solution up to strength. My Super A is pressurized and up here we mix everything for -40F. It will hold that antifreeze solution strength at least 10 years, without adding antifreeze. Beyond that I've always drained it and filled with new product.
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