Have had an older Merc outdrive in the backyard for a couple years with no oil in it and...SURPRIZE!!! I cant get it to manually turn as I'd like to sell it now. It has low hrs on since its been rebuilt. Any suggestions on what I need to do,how and anything else I need to check for to ready it for sale. Its an older Mercruiser as the top cap(4- 12 pt bolts about 4" sq.) has the eyehook lifting hole.Thank You much in advance for any help, all is appreciated.