# SDR 2020FA0000011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 15, 2019
- Submitted: January 8, 2020
- Operation: General aviation
- Aircraft: [N2129C](https://openairdocs.org/aircraft/N2129C), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S9436
- Engine: Lyc IO360L2A
- System (JASC): [8500 · Engine (Reciprocating)](https://openairdocs.org/jasc/8500)
- Part: Exhaust Valve
- Condition: Sticking
- Location: Engine
- 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/2020FA0000011

## Discrepancy

ENGINE WAS FOUND WITH A STICKING EXHAUST VALVE AT582.4 HOURS TOTAL TIME.  LYCOMING SB388C WAS PERFORMED, ALL GUIDES WERE REAMED TO WITHIN TOLERANCE.  THIS ENGINE INCORPORATES NI-RESIST VALVE GUIDES AND THE TIME TO FAILURE IS CONSIDERED BY THIS AGENCY TO BE PREMATURE.

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