# SDR ECPR2018040378436

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2018
- Submitted: April 3, 2018
- Operation: General aviation
- Aircraft: [N903FC](https://openairdocs.org/aircraft/N903FC), registered now
- Make and model: Piper PA-28-161
- Registry model: [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161) (OpenAirDocs)
- Aircraft serial: 2842175
- Aircraft time: 5,782 hours
- Engine: Lyc O320D3G
- Engine time: 9,980 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Exhaust Valve
- Part number: 17B23936
- Condition: Worn
- Location: Nr 4 Cylinder
- Part time: 1,187 hours
- Component: Cylinder, Lyc
- Component part number: LW12416
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ECPR2018040378436

## Discrepancy

DURING A SCHEDULED INSPECTION,  FOUND THAT THE NR 4 ENGINE CYLINDER HAD LOW COMPRESSION. INVESTIGATION FOUND THAT THE EXHAUST VALVE FACE AND EXHAUST SEAT INTERFACE SHOWED EXCESSIVE WEAR CAUSING THE EXHAUST VALVE FACE TO CUP.

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