Abstract: The rotating parts of a vehicle engine water pump are assembled directly upon the engine block so that the block forms the pump housing. The pump parts include a drive wheel, such as a pulley or sprocket wheel, mounted upon one end of a drive shaft, with a pump impeller mounted upon the opposite end of the shaft. An open cavity is formed in the block to receive the impeller. A cover, having a central opening through which the shaft extends, covers the impeller and cavity and is sealed against the block, around the cavity, so that the cover and block together form a complete, sealed housing. The shaft is rotatably connected to the block, within the cavity, and the drive wheel is located on the outside of the cover, adjacent the block, for connection to a belt or chain from the power supply.

Abstract: An engine water pump assembly is formed of a rotatable shaft divided along its length into a bearing portion terminating in a drive connection and a sealing portion terminating in an impeller end upon which a water impeller is mounted. A tubular, journal-type bearing surrounds the shaft bearing portion. A pump housing surrounds the shaft and bearing and has an integral, enlarged chamber formed on one end within which the impeller is located. The opposite end of the housing has an opening through which the shaft drive connection extends. The bearing has an integral, annular flange which surrounds a part of the shaft sealing portion. A seal mounted upon the shaft sealing portion seals against the flange to prevent the flow of water from the impeller chamber to the bearing part of the housing and its opening. The housing is molded around the bearing to form an integral subassembly.