Does anyone have experience with a cracked cylinder liner? I Just changed my head gasket and have air bubbles in coolant. It’s. A new boat and I had evidence of water in oil so I just took the head to machinist and had valve and what not done. She runs great and no smoke but I’m getting some blow by at dipstick and air bubbles in coolant. I’m about to redo head gasket. After talking with Brian at American diesel I discovered torque it was about 15 lbs under recommend. I’m thinking head gasket or cracked liner.