Yanmar "Starting to use oil" - Page 3 - SailNet Community
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post #21 of 21 Old 11-13-2019
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Re: Yanmar "Starting to use oil"

Originally Posted by bristol299bob View Post
Pressure in the crankcase (felt at the dipstick and oil fill) is a classic sign of a failed headgasket. Similarly it could be a cracked lock or cracked head. It's also common symptom of a failed PCV if you have that. It could of course be worn rings or valve seals, but more likely that exhaust gas is escaping into the crankcase via headgasket leak or a crack......
All good points. I'm not sure many small diesels have PCV valves, rather just straight breather tubes. A clogged breather would be the very first thing I checked, before surgery. Dirty engines that breath off the valve cover can throw sludge into the tube. Oil flush should be routine maintenance and rarely done by many.

All crankcases have some positive pressure, from blow by, so I'd want to be sure what Dennis is finding isn't normal breather pressure that can't get out where it should.

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