The most common reason for noise in the head is that the moving vari drive disc bushings wear out. Usually the motor one wears out first. In 1980 these were thin black plastic that were epoxied into the vari drive disc. The newere verion are a thick green insert but it is not replaceable. If you let it go too long, it will tear up the motor shaft. I do not recommend replacing the bushings. I rebuild these heads in my garage and in the field. I cannot guarantee that you can glue these in and still have the varidisc run dead nuts true. You may wind up with a vibration and be doing this all over agian in a few mounths. I typically do a "top end kit" which include the 3 bearings, motor adjustable vari disc, driven adjustable vari disc, and a vari drive belt. In a production enviroment, you should be good for 6 years or so before doing this again. If your motor shaft is torn up, that can be purchased as a balanced rotor and shaft assembly. I work for Bridgeport dealer. My parts man is Alan at 1-800-245-2598. He can quote all of this for you. Yes, horsepower matters.
George W.  |