I had a boat that had a sizeable leak where the hull joined with the deck. Sitting still it wasn't any problem because the hull/deck joint was well above the water line. While running, however, the spray off the bow (especially in a turn) would come up, hit that joint and leak into the hull. The rudder post is another likely spot to leak while running but not while sitting. It is probable that the top of the rudder pipe is above the water line so that it doesn't leak when the boat is sitting still. Under way, however, the force of the water hitting the rudder can channel water up the rudder shaft above the water line and cause it to leak. A leak that occurs when then engine is running could be from a water pump. There are two: the raw water pump that pulls water up from the lake and the circulating pump, which is the same as a car has. If either of these pumps are starting to fail they could leak out the shaft when the engine is running. Replacing a freeze plug could be a $5, ten minute job if you can get to the freeze plug. If you have to pull the engine to get to the freeze plug then it could be $1000. Of course, if one is bad they are all suspect. Rod
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