CNKS said: (quoted from post at 02:36:13 06/23/13) All I know is that in the 50's may dad's H with a pressurized radiator would leak out the overflow with temp in the 90's-100 at full load, and I do mean full load. I am guessing that was a 4 lb, but that is only a guess. If correct a 7 lb might have helped, or maybe not, because the engine temp in the afternoon would be on the edge of the red. Probably should have shifted down a gear. Also we did not use antifreeze in S Texas, that would have helped with the overflow also. For the way most old tractors are used today I doubt if it makes any difference.
I suspect you are correct. I imagine the 7 lb'er was an upgrade to the original stock 4 lb'er. Lots of people were working those things hard back in the day and then later adding super kits so the cooling system could use any help it could get. Increased pressure does increase the boiling temp of water so it would help. I am going to go with the 4 lb'er for now (got a new one for $0.99 on ebay earlier today). It will be an improvement over what was on there which I think was a 7 lb'er but since part of the gasket was missing it was more like a 0 lb'er.
I worked the ole h last weekend bush hogging weeds taller than the tractor for a neighbor. This was by far the hardest I had ever worked this tractor. While it did not overheat, it did spit a bit out the overflow which it had never done before even when worked on the mower conditioner doing hay.
This post was edited by rankrank1 at 19:22:36 06/22/13.
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