HELP ! I listened to someone i should not have and took the lower unit off my stern drive because he said that was where the impeler was. Well it wasnt. I put the unit back up, lined the two shafts up, and now the propeler just free wheels nd it wont go into gear when I shift forward. Reverse seems to bind. Should I have dropped lower unit a certain way. Is there anyplace to downlaod a manual on line ?