How is a Water Pump Made?
Water pumps are made of a handful of components, including a housing, a shaft, and an impeller. The water pump housing is the most visible component. After removing the water pump, you may find the star or wheel-shaped impeller is made of steel or plastic.
Some water pumps have a belt-driven pulley mounted on the shaft. Others are driven using internal gears. Water pump components are often manufactured using heavy factory equipment, however, they may be assembled either by a machine or by hand. You may be able to replace just the housing or impeller to repair the water pump, depending on the design of the particular water pump. Rebuilt kits are often available to help restore a failing water pump without having to purchase a new assembly.