I recently replaced my valve cover gasket,thus i had to remove the shift cables,and throttle cable as they mount on top the valve cover.Its a 120 mercruiser with an alpha one outdrive,1987....Since ihad it apart,i cant seem to get reverse,forward cliks in as it should,but i cant seem to get reverse,i also just replaced the water pump impeller at the same time.How would i know if the shift shaft or intermediate shaft are bad..everything seemed tight,but i am new to the inboard/outboard setup...thank for all the help....matt