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Small End Bearing
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In that system, oil is circulated through the system using an oil-pump, which may be driven directly from the crankshaft or indirectly from the camshaft or any auxiliary shaft. When the camshaft rotates, oil from the sump is drawn through the submerged strainer and pick-up pipe to the pump. The oil is then compressed and discharged through a drilling to the lubrication system. Control of the oil pressure is achieved by a pressure-relief valve situated on the output side of the pump. If the oil pressure becomes too high, the relief valve will open, bleeding any surplus oil back to the sump. From the oil-pump, all the oil flows through drillings in the crankcase to a cylindrical filter unit. The oil circulate around the filter bowl, forces its way through the center and flows out to the main oil gallery (the main oil passage). By various branch cross-drillings in the crankcase, oil is distributed to the crankshaft main-journal bearings and to the camshaft bearing.
