The engine oil pump keeps the internal components of the engine properly lubricated by pumping the oil from the oil pan to the rest of the engine. Located just above the oil pan, this pump is chain driven from the crankshaft. If the oil pump fails or becomes too clogged due to excess debris or sludge that made it's way to the oil pan, the engine will not be properly lubricated and metal to metal wear will occur, often causing extensive damage.
