hypersniper2010
New member
ive done a search and im still a bit confused as to what to look for. I have a mercruiser 3.0 I/O and am getting water in my #4 cylinder and its hydrolocking my motor. I am also getting water in the oil too somehow. I have pulled the manifold and checked inside the head ports and see no kind of cracks or rust scale. I have looked in the manifold and I did notice a hole in the rounded part of the manifold that seperates the water from the exhaust. cooling jacket I assume. ok with that said im confident that it is where my water is coming from but then how does it get into my oil pan ? motor ran great prior to finding this.