Cooling is important to an alternator's efficiency. It is simple to identify an older unit via the exterior admirer blades identified around the rotor shaft behind the pulley. This drawing illustrates the small clearance spec of 0.040 inch involving the pinion gear and the flexplate. (Graphic/Jeff Smith) With that spec https://hejiannuojinautopartsco80134.educationalimpactblog.com/56838494/the-smart-trick-of-alternator-parts-that-no-one-is-discussing