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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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