Thanks for the reply s130 but 'no' it doesn't answer my quetion. The alternator cannot be removed from the top unless the engine is out and that will probably take more then the 4 hrs labour quoted for the job. There appears to be not enough clearance if you need to remove it from below and I was really asking for probably an experienced 'FIAT' mechanic if in the official procedure for replacement, the shaft is removed. Thanks once again for your answer as you were the only one to respond.