So the used engine I just installed in my 1987 Cruiser Yacht Holiday 254 does run but when you add steering fluid to the reservoir it gets sucked down and comes back a frothy milkshake. Looking through these forums I suspect the (steering)oil cooler. I took one off of another engine the previous owner seized and here is what it looks like. There is no honey comb structure however I attached a plugged hose on one end and a line with a garden hose in the other and it held, meaning no water coming out through the steering fluid stubs. But being this hollow, is it roached?