A failure in the bearing journal can wreak havoc on a motor. As with other bearing-related problems, it is among the most common causes of failure in electric motors. Usually, the bearing surfaces and shaft are separated by a layer of oil. This oil keeps the engine’s components adequately lubricated so that they can rotate and perform without a problem. If the bearing journal loses its protective layer of oil from damage, corrosion, overheating, too much stress or overloading, and other problems, the motor will stop functioning properly. Vibrations and running hot indicate a bad bearing journal.