Our IO-360 angle valve is giving indications of a sticking valve. Plugs, mags, etc. have been checked. Checked compressions when cold and all seems ok but we've grounded it pending a further investigation. Everything I read and see gives great instruction on cleaning the stem and guide on parallel valve engines but I don't see anything on angle valve engines. Probably because angle valves are less prone to sticking. I'd just like to know if there are any different techniques, tricks, etc. in case we do indeed have a sticking valve. Years ago, I had one stick in a Cessna 172 and just made it to an airport. Don't intend to repeat that experience again. Also, I plan to use the nominal ream size (.4995).
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