The "common wisdom" when detergent oils started becoming popular (after WWII, as I remember) was that you should NOT put detergent oil in an engine that had been run for a long time with straight oil. Supposedly, the detergent would loosen up all sorts of stuff that had accumulated in the oil system. Don't know if it is true, but my father--an avid reader of auto mechanics' journals--used to tell me this. I am assuming that you know all about impulse couplings, making sure they are set (easy to forget when the coupling has to be set manually), etc., and that you know that pushing DOWN on a crank is a great way to break your arm. My father had his arm broken cranking a Ford, when he tried to spin it to get better spark (the Ford mag, on the flywheel, had no impulse starter, so the juice got better when you spun the engine faster). An impulse starter won't give you any better spark from spinning the crank, I think. The spin given to the mag after the impulse trips is pretty good, and would probably give a better spark than you could get by spinning the engine without the impulse (ouch!). When I used to crank these beasts (10-20, F-20, "Regular," F-12, Oliver H-P Row-Crop), I always retarded the spark for extra safety. I still don't know if this retarded the spark beyond what the impulse does. Hope I'm not telling you what you already know, but I just wanted to add these words about safety.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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