healthfx

Thanks for the tips. They really helped. The problem was a cracked exhaust valve, and a burnt one. Once pulled we looked closer at engine. No corrosion, as also show my constant oil analysis. Rebuilt cylinders. Putting on now. Will be running Marvels Mystery oil. Looked into overhaul based on years on engine, and only having 400 hours on it. According to Lycoming any engine that is over 2000 flight hours or 12 years since overhaul must be overhauled. Using that criteria the engine is over TBO. That being said this is something mandated by the manufacturer, not the FAA, so it is not required for part 91 operators. Updated pics coming soon! Anything I should look for in particular when flying out of this annual for the first few times?

Twenty year old, factory overhaul engine on m20C, with 400 hours. Needs two new cylinders. Is it wise to just replace them or get overhauled engine? Could the bad cylinders be an indication of future problems with existing engine?

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