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Speaking from a fellow boater who is in the middle of a complete engine remove/rebuild/replace, there is no such thing as "over kill"!I have discovered fresh water in the engine atop the cylinders. I have removed the water and convinced the risers/ exhaust elbows are bad. I have not discovered any water oil mixture on the dip stick and the level remains right. I am however adding a die to the coolant replacing the plugs running the engine to operating temperature. Once the engine has cooled I will take an inferred light and check the plugs to assure the water issue is not from the cooling system. I am wondering if this is over kill.