It sounds like a drain hole on the clutch cover. It was plugged and held the water in there. Water cooled clutches don`t work too well for your application Are there about 4 screws holding the tin cover on the bell-housing?
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us. - - Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!