I was not aware that the drives themselves had a seawater intake. Perhaps they do; I just haven't had occasion to work with them much.
The intakes for the engines and other systems on a boat should be checked regularly for fouling and such. If you don't do it at the end of a trip, you get to do it before the next trip, which may cause delay, or you get to do it during the next trip, which may be a career decision....
Mike Halloran
Pembroke Pines, FL, USA