"I always 'assumed' oil pumps just did their thing without a prime"
For everyday use they do. There are a couple occasions when priming is a good idea, however. When you shut off your engine, it merely stops pumping. The entire system doesn't drain. Oil is still in most of the parts, merely without pressure. After you rebuild an engine there is no iol anywhere in the system. Some people coat everything with something like STP to lubricate it for that short period that no oil is in the system. Often when I worked in the salvage yard, we would take an engine that had been upside down or such for a really long time. On many engines, we can remove the distributor and insert a modified shaft from another distributor and turn the pump to circulate oil thruough out the engine. Now really big engines used on stationary plants, Ships etc. have a detached LOP that is started before the engine, so when the engine starts it has oil pressure already.
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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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