With a crankshaft installed in the engine it is difficult to measure main bearing clearances with a ordinary set of micrometers. Even a micrometer made to measure journal that is in engine is not simple.
The way it was done is simply with shim stock. It can be brass or paper. You measure the thickness of the shim stock. Cut off a piece like half inch wide, full width of journal and lay it on journal. If it locks crank tight with cap on, you have less than shim. If it drags some you are right near that clearance. If turns free you have more clearance than shim.
I prefer shim but do use plastic gauge , micrometer and shim depending on situation. Plasti gauge gives lots of false reading if everything isn't just right , like temp of the plastic and condition of crankshaft. That is why mfgs recommend using micrometer readings if possible.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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