Need help!! I have a 80 HP Merc, 3 cylinder engine. The number 2 cylinder was getting water into it. I tore the engine completely down, could find no cracks in the cylinder area. I replaced all of the gaskets during the rebuild. Engine ran perfectly for about 5 minutes then started to "miss". Pulled the #2 plug and found a slight amount of water. Could it be the little check valve on the intake manifold. I have never seen these little ball valves in the older engines. Can you run the engine without these little ball valves? Any way, my real question is where could this water be coming from? Does the 80 Merc have any history on this? This engine has blind cylinders and the best I could do when I had it apart is to look for cracks with a flash light but could find none. Any help or ideas, especially from some one with similar experience would be appreciated. Capnzee