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Message: <blockquote data-quote="Tazza" data-source="post: 141859" data-attributes="member: 82">Blowing the dip stick out is from crank case pressure, this is almost always due to rings not sealing the bores. You mentioned that you have had over heating issues, there is a good chance the rings have stuck in the ring grooves.You are this deep, pull the sump, then the pistons. Check the rings are not stuck.The cracks in the pre-coms is not unusual, they almost never crack too far and fall into the cylinder. We rebuild a hand full of these engines every week, and i think i have seen one fall in 3 years i have been there.Check the groove from the pre-com to the valves for cracks, this is the most common area they go.The oil in the cylinder trick is a wet test. When the head is on, pull an injector or glow plug measure the compression, then give it a squirt of oil and re-test. If it goes up it shows your rings are not sealing.</blockquote>