My inbd was leaking and it turned out to be the rubber seal from the bell housing to the outdrive was tore on the bottom and water was running down the drive shaft and bearing and leaking into the bilge. Also check to see (if yours has one) if your external water pump on the front of the motor is leaking.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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