# SDR 96ZZZX5607

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 23, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [MAC Aircraft Maintenance, repair station FSER011E](https://openairdocs.org/faa-repair-station/FSER011E/mac-aircraft-maintenance.md) (OpenAirDocs)
- Aircraft: N6344V
- Make and model: Cessna 172RG
- Registry model: [Cessna 172RG](https://openairdocs.org/model/cessna-172rg) (OpenAirDocs)
- Aircraft serial: 172RG0635
- Engine: Lyc O360F1A6
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Condition: Stretched
- Location: Nr 4 Exh
- Part time: 624 hours
- Stage of operation: NR
- Nature of condition: E, R
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX5607

## Discrepancy

PILOT REPORTED THAT THE ENGINE RAN ROUGH AT FULL POWER.  REMOVED VALVE COVERS AND FOUND NR 4 CYLINDER EXHAUST VALVE HAD NO CLEARANCE BETWEEN THE VALVE AND ROCKER ARM.  THE VALVE HEAD WAS STRETCHED.

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