# SDR 2018FA0000509

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 11, 2018
- Submitted: December 11, 2018
- Operation: General aviation
- Aircraft: N830KS
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S11106
- Engine: Lyc IO360L2A
- Propeller: Mcauly 1A170E
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Exhaust Valve
- Part number: LW19001
- Condition: Stuck
- Location: Nr 4 Cylinder
- 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/2018FA0000509

## Discrepancy

EXHAUST VALVE IN NR 4 CYLINDER STUCK IN FLIGHT CAUSING THE EXHAUST PUSH ROD TO BEND AND BREAK.  THE PUSH ROD TUBE ALSO BROKE ALLOWING ENG OIL TO ESCAPE.  THERE WAS A DRASTIC LOSS OF ENG OIL AND ENG OIL PRESSURE.

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