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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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