The BMW 328i Oil Pump maintains the lubrication of engine parts by pushing pressurized oil to bearings, pistons, and camshaft. Built around sturdy gears, springs, and a relief valve, this Oil Pump sucks lubricant from the sump, then forces it through the filter, and routes it across moving parts while driving actuators. The 328i has applied crank-driven units; however, there are three styles of drives, each mounted on the crankshaft in a different way. A direct drive Oil Pump is placed to surround the crank in such a way that the gear attached to it rotates according to the engine speed. A gear drive is placed to the side and coupled by a companion gear, or a chain drive is designed using sprockets and a chain to transfer motion. All styles have the same purpose, although direct drive provides compactness, gear drive facilitates service, and chain drive produces reduced noise. Regular service on BMW engines requires that the Oil Pump housing and relief valve be inspected. If an engine is rebuilt on a 328i, owners must be sure that the passages are clear so that the system will maintain a pressure of about 10 psi per 1,000 RPM. Because BMW specifies tight tolerances, the 328i Oil Pump also feeds pressure switches that will light the dash if pressure is low, safeguards that help BMW drivers avoid costly damage.
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