# SDR 20000413SH054

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 28, 2000
- Submitted: April 13, 2000
- Operation: General aviation
- Aircraft: [N9621V](https://openairdocs.org/aircraft/N9621V), registered now
- Make and model: Cessna 172M
- Registry model: [Cessna 172M](https://openairdocs.org/model/cessna-172m) (OpenAirDocs)
- Aircraft serial: 17264401
- Engine: Lyc O320E2D
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: LW12416
- Part serial: H4898H
- Condition: Damaged
- Location: Nr 4
- Part time: 832 hours
- Stage of operation: NR
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20000413SH054

## Discrepancy

PILOT REPORTED ROUGH RUNNING ENGINE AND LOW RPM.  MAINTENANCE FOUND NR 4 CYLINDER HAD EXHAUST VALVE STUCK OPEN, NR 4 CYLINDER PUSH ROD AND HOUSING WERE BENT WITH NO OIL LEAKAGE.  THE PISTON WAS NOT DAMAGED AND NO METAL FOUND IN THE ENGINE OIL FILTER. (X)

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