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There are two different types of couplings, the older having two rubber bumpers and a cup shaped retainer. The newer being a one piece design. The newer style are repairable at a cost some where around $500 (two year ago price).
If you have the older style, please be aware that any loose pieces can fall into the engine (not good) if they are not retrieved as the alternator is withdrawn from the mount pad. Keep a mechanics magnet handy for this evolution.
Go ahead and remove the battery and battery box, and any air hoses (SCAT) out of the way before you begin. Be careful from man handling the wires on the back of the alternator, remove them before you start and tag their location.
Your mechanic can give any other tips that he has as far as what he wants since he will have to return the aircraft to service after the task is completed.
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