Causes of water pump failure A failed seal is the most common water pump failure A water pump seal keeps high pressure coolant from leaking out of a rotating component. The water pump seal prevents coolant from reaching the row of bearing that allow the pulley shaft to rotate. In some cases the seal is made from two ceramic disks; one stationary, the other rotating. The discs are lubricated by the engine coolant. How seals get damaged Rotating the pump shaft when the seals are dry If you’re installing a … Read More

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