Mercruiser 120 water in oil

nearpar

Petty Officer 2nd Class
Joined
Sep 4, 2010
Messages
143
I have a 78 Starcraft islander with a 120 hp 4 cyl I have discovered water in the oil " milky " Could be a cracked block or maybe exhaust manifold ?
Has good compression and runs good. also noticed one of the cylinders was blowing steam when I removed the spark plugs when it was still hot. What do you think ? I want to try to resovle where should I start on this ?

Thank you
 
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