# SDR 97ZZZX824

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 21, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N4635L](https://openairdocs.org/aircraft/N4635L), registered now
- Make and model: Cessna 152
- Registry model: [Cessna 152](https://openairdocs.org/model/cessna-152) (OpenAirDocs)
- Aircraft serial: 15287201
- Engine: Lyc O235L2C
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Part number: SL17235AD
- Condition: Worn
- Location: Cylinder Exhaust
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZX824

## Discrepancy

INVESTIGATION FOR A PROGRESSIVE DETERIORATION OF ENGINE FOUND EXCESSIVE WEAR ON VALVE STEMS, VALVE SEATS DEFECTIVE, RING AND PISTON WEAR EXCESSIVE.  SUBMITTER STATES ENGINE WOULD NOT MAKE 2,400 TBO.  ENGINE OIL CHANGED AT 50-HOUR INTERVALS.  PHILLIPS 20W50XC OIL USED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.