In popular inline 4-cylinder overhead cam (OHC) engines, the water pump is driven by the timing belt, while on V-style engines, it is driven by a V-belt via a pulley mounted on the pump shaft flange. Basically, it’s an impeller inside of a housing that circulates the coolant through the engine. Unfortunately, the water pump operates in a slightly harsher environment than its lubricating counterpart, which may result in water pump issues over time and miles of operation.Īside from material (many water pumps now use aluminum castings as opposed to cast iron), not much has changed with water pumps over the years. This component is as critical to the cooling system as the oil pump is to the lubrication system. It also pumps coolant into the radiator to remove heat throughout the engine. It works to pump coolant through the engine in order to remove the heat. The water pump is the heart of the cooling system for any engine.
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