# SDR 2020FA0000352

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 31, 2020
- Submitted: August 1, 2020
- Operation: General aviation
- Aircraft: [N11182](https://openairdocs.org/aircraft/N11182), registered now
- Make and model: Cessna 182Q
- Registry model: [Cessna 182Q](https://openairdocs.org/model/cessna-182q) (OpenAirDocs)
- Aircraft serial: 18266815
- Aircraft time: 3,233 hours
- Engine: Cont O470U
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 658598
- Part serial: AC15FA427
- Condition: Leaking
- Location: Nr 2
- Part time: 205 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2020FA0000352

## Discrepancy

CONTINENTAL (AIRBOSS) CYLINDER P/N 658598 S/N AC15FA427 INSTALLED ON AUGUST 31, 2015 PER THE ENGINE LOG BOOK.  COMPRESSION TEST IN JULY 2020 IDENTIFIED LOW COMPRESSION ON THIS CYLINDER, WITH A LEAK IN THE EXHAUST VALVE.  THE EXHAUST VALVE WAS REMOVED AND THE VALVE SEAT FOUND TO BE MISALIGNED.  MECHANIC BELIEVES THIS TO BE A MANUFACTURING DEFECT IN THE CYLINDER ASSEMBLY.  PART WAS REPLACED WITH A NEW SUPERIOR MILLENNIUM CYLINDER ASSEMBLY.

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