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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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