I got my 87 glasstron back in the water today after having the transom rebuilt and it leaked. It looks like it might be coming in around the exhaust coupling behind the engine. I didn't replace the gasket there ... does that usually need replacing after removal? Also, as the title suggest... what does a bad coupler sound like ? It sounds like a rattling coming from area. there also water coming in around the gimble... perhaps the bellows.