Wallaces farmer and Hoards Dairyman had some articles when first worried about unleaded: Ford N flatheads- no problem exhaust valve seats were stellite or similar to start. JD twins running under 1300 rpm and 160 thermostats- no observed problems at the governed speed. Molines at 1000/1200 rpm- minimal to no wear, like JDs the exhaust valve sat long enough on seat to transfer heat. Case, AC, IHC running 1600/2000 rpm- these had some measurable wear under load, adjust valve yearly in spring and keep working, watch it. IHC had a suggested 1 cup engine oil to 5 or 10 gallons gas mix that helped some. A 100/1 2stroke oil mix was partially tested on some and seemed to help, test was not long enough to be considered conclusive. testing times were varied, 2 to 3 years field work and some short dyno tests. The 50s to 60s tractor seemed to be most affected- higher speeds and built when leaded gas was standard so the iron seats that worked good- were industry standard - for heat transfer and wear used then. Pre-WW2 classics were usually slow speed and lighter use, often setup at design time to use farm standard unleaded gas and distillate, not considered to be much at risk but the tests didn't check out many of them- a few F20s, JD A,Bs, the 9N Fords. IHC oil in gas recommendation and/or 2 stroke oil plus a can of seafoam for storage and work them a bit, check your valve lash yearly if you have a 'high' speed governor setting and a 200 degree thermostat. RN
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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