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Lycoming Engine FAQ

How do I tell if I have sodium cooled exhaust valves in my Lycoming engine

The rocker arm pushes directly against the top of a solid stem valve.
The rocker arm pushes against a rotator cap that sits on top of the sodium cooled valve

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Disclaimer: sacskyranch website contains abundant information relating to aircraft maintenance. The information provided is not intended to supercede or supplement the F.A.A. approved maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft