MGA generator pulleys came in two different sizes. MGA Twin Cam generator pullies and fans also came in two differente sizes, all different from the pushrod engine cars. The standard car pulleys were two piece stamped sheet metal rivited to an allow hub. If the rivets work loose the part is usually junk and needs to be replaced. The Twin Cam pulleys were cast iron and virtually indestructable.

Original fans are typically two pieces of sheet metal spot welded together, the front piece being generally flat and the rear piece formed into the blower blades. The center hole may or may not be offset from the flat plain depending on how wide the fins would be.


These pictures show an aftermarket molded one piece pulley and fan. Material is phenol-fiber, Phenolic or Bakelite. This one was purchased sometime in the early 90's. The pulley size matches the smaller pulley used on the pushrod MGA cars. The fan is about the largest size that can be accomodated by the generator, both in diameter and thickness. The fan blades initially jammed on the bolt head for the adjuster link, so I nipped off the corner of each blade to allow it to clear and turn. This piece was in service for two years while awaiting delivery of an original style replacement front pulley. I was happy to remove it in time as I never quite trusted the mounting nut to stay tight against the plastic part.