# SDR 2006FA0000008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 21, 2005
- Submitted: January 6, 2006
- Operation: General aviation
- Aircraft: N4676U
- Make and model: Cessna U206G
- Registry model: [Cessna U206G](https://openairdocs.org/model/cessna-u206g) (OpenAirDocs)
- Aircraft serial: U20604352
- Engine: Cont IO520F
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Exhaust Valve
- Condition: Stuck
- Location: Engine
- Part time: 376 hours
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2006FA0000008

## Discrepancy

THE EXHAUST VALVE GUIDE HAD .0035 INCH OF BUILD UP MATERIAL, CAUSING THE VALVE TO STICK OPEN, WHERE IT STRUCK THE PISTON.  POSSIBLY DUE TO RICH MIXTURE.  (K)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.