# SDR 95ZZZX2665

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 6, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Engine: Cont IO520BB
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve Stem
- Part number: 646286
- Condition: Worn
- Location: Cylinder
- Part time: 333 hours
- 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/95ZZZX2665

## Discrepancy

FOUND 5 EXHAUST VALVE STEMS WORN ONE-FOURTH THE DIAMETER OF THE VALVE STEM.  THESE WERE FOUND ON AN ENGINE TEAR DOWN FOR PROPELLER STRIKE.  THESE VALVES WOULD EVENTUALLY HAVE CAUSED ENGINE FAILURE.

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