Quote:
Originally Posted by tkwalker
Did you pressurize your lower unit to see where it was leaking (Between 5 to 7 PSI) ... Drain and vent plug seals very, very rarely cause a problem even sometimes when they are missing .... You have another leak somewhere ... Shift linkage, Upper Drive shaft seal (It's below the water pump) or output shaft seal ...
I had a 225 HP Merc 3.0 liter Blue water 23 inch shaft on my Guide Boat That I never could stop from leaking ... I rebuilt it twice and the factory rebuilt it twice ... What I had to do was run Quicksilver High Performance lower unit oil ... If you let the motor set for three days the water and oil will separate .... The water will go to the bottom when you pull your Drain plug the water will leave ... When you see the oil you can add it back to the lower unit ... You do not have to completely drain and refill ... This oil mixes with water to continue to lubricate ... At anytime you see milky oil it has water in it ... Hope this helps ... <'TK>< 
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Thanks TK Ill check that out.