US Patent 8979603 Lubrication of a hybrid propulsion system for a watercraft

A watercraft propulsion system has a driveshaft, one of an impeller and a propeller, an overrunning clutch having outer and inner races, a driveshaft connector connecting the driveshaft to the outer race, an electric motor having a motor output shaft operatively connected to the outer race, and an internal combustion engine. The engine has a crankcase and a crankshaft operatively connected to the inner race. A lubricant pump supplies lubricant to the overrunning clutch via lubricant passages in the crankshaft. A watercraft having the propulsion system and a hybrid propulsion conversion system for a watercraft are also disclosed.