we were out skiing today boat was running fine and temp gauge was normal. stopped to switch skiiers and boat would not start checked numerous things still could not get it to turn over. pulled the dipstick and found water in my oil. when we pulled the boat out of the water i noticed my exhaust flappers were missing.

I think when we through it in reverse water traveled through my exhaust into the oil (dont know if that is possible)

any ideas on how to fix this problem?