The BMW 335i Pilot Bearing is found at the end of the crankshaft or in the flywheel hub. It centers and steadies the transmission input shaft. This allows power to slip from the engine to the gears without grind or chatter. The Pilot Bearing reduces friction and keeps heat low while avoiding premature wear through rolling on polished races instead of dragging metal on metal. Throughout the model years, the 335i has relied on two styles, a true Pilot Bearing containing tiny hardened balls or rollers or a sintered bronze Pilot Bearing commonly referred to as a pilot bushing. This rolling style can withstand both radial and axial forces even at high shaft speeds. The bronze-type version assists the shaft by having an oil-soaked surface that produces a thin lubricant film on the surfaces. The driver of a BMW performance sedan may notice growls or pedal pulse or stubborn shifts when a Pilot Bearing breaks down, as this will see the input shaft wobbling against clutch discs. An inspection is routinely done to check whether the 335i's transmission has lost any scoring, roughness, or looseness and if so, will be replaced swiftly. This ensures the transmission has the slick, sporty character you expect any BMW 335i to have.
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