The BMW 328i Pilot Bearing holds the transmission input shaft perfectly in the center of the crankshaft, allowing engine torque to flow into the gearbox without grind or shake. This is a small component that allows friction to be reduced as the shaft spins on polished races instead of metal to metal, which not only saves power but also limits the heat, protecting gears and keeping the BMW clutch action smooth. This makes regular Pilot Bearing maintenance worthwhile. Early and current 328i models may have either a true Pilot Bearing with steel balls or rollers packed into the bearing or a sintered bronze Pilot Bearing in the form of a lubricated bushing, but both of these have the same job of alignment and support. The ball or roller style is for drivers who put more radial and axial loads on the shaft because the balls or rollers roll smoothly on inner and outer races, whereas the bronze bushing is predicated on an oil film embedded in its porous body and thus works well under lighter demands common on high-mileage 328i cars. The Pilot Bearing is a common area for wear and tear and is often first noticed by drivers as whining noises, vibrations in the pedals, and difficult shifting, which are common signs that the BMW drivetrain input shaft is no longer being squarely held.
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