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We use brass for sensor housings installed in high-vibration environments, including turbocharger housings. There has never been an issue with fatigue failures from vibration - I wouldn't worry about it, especially for a crankcase vent fitting. The worst that could happen is you end up with a mess if it breaks. For this application I would use an aluminum fitting because of the weight issue. For pressurized applications I understand that only steel fittings are "approved" where vibration is an issue, essentially wherever a hose is connected to the engine, regardless of which end.
Gary Casey
While building my plane I was instructed by an A&P to never use brass fittings on the engine, as they will crystallize over time and could eventually break. Can anyone verify this information?
Gary Edwards
LNC2 N21SN
Medford, Oregon
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