This is probably stuff you already have, but just in case... My 50 Motor Trk Man (1936-49) has the R-6513, R-6752, R-6586 and the R-6602 in the Cont engine section--basic specs, otherwise pathetic: 6 pages for whole section and mostly drawings at that. If there were others used later they could be in later Motor issues. A couple old incomplete catalogs (1930 and 34) IH sections show: "HS-54, 54C-W1-2 Hall Scott Eng 151 29-33" "HS-74-74C--W3 Hall Scott Eng 152 29-33" (those are out of the 34 catalog, that ends with 33, so those models may've gone past 33). The 1930 catalog shows the 54's as 21/2 Ton; the 74's, with the addition of Model HS104C, as 31/4-5 Ton, and states the engines are "A.C.F. (Hall Scott)", but doesn't state any engine numbers. The 30 catalog also omits the "W1-2" and the "W3" parts of the listings in the 34 catalog. It also shows, under A.C.F. engines: "A.C.F. 4cyl (Hall Scott Mtr) #151 41/2x51/2"; "A.C.F. 4cyl (Hall scott Mtr) #152 43/4x51/2". Might find more info on oldihc.org; don't know of a good diesel site, but the guys at aths.org are always discussing highly obscure technical points of various Cummins, so they might help with knowledge or a site. Weren't those marine "Invader" engines on smokstak Hall Scotts?? If so, some of those posters may be Hall Scott fiends. That's about all I have. Good luck.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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