"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 - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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