The Pilot Bearing maintains the proper alignment of the Subaru Impreza transmission input shaft in the crankshaft to allow for easy gear changes. The Pilot Bearing is installed at the rear of the boxer engine crank or in the center of the flywheel. With the Pilot Bearing in place, the spinning input shaft rotates freely in the gearbox while the splines are free to slide without metal to metal drag. The Pilot Bearing restricts heat and wear by limiting friction. It stops the chatter, vibration, and hard shifting the driver notices when the bearing starts to fail. Throughout the generations of Subaru Impreza manuals, there are primarily two types, a rolling element Pilot Bearing and a plain bronze pilot bushing. The rolling type uses tiny balls or rollers that course over polished races and can work at higher rotational speeds with radial and axial loads. There is the bushing version which uses an oil fed bronze sleeve that the shaft rides on. This is simpler and cheaper but has a lower load capacity. A clean, precisely fitted Pilot Bearing keeps the shaft aligned with clutch discs so the gearbox can slip into gear without grinding. Drivers of Subaru Impreza cars often hear squeals or feel pedal pulses as the bearing pits, which signal that the replacement restores the light shifting feel the platform is known for.
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