# SDR 95ZZZX585

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 13, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Engine: Cont IO520BA
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Part number: 646283
- Condition: Excess Wear
- Location: Cylinder
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95ZZZX585

## Discrepancy

INSPECTION FOUND 2 EACH, PN 646283, VALVES OUT OF A FACTORY REMANUFACTURED ENGINE WITH TEST CELL BREAK-IN TIME ONLY.  (LESS THAN 3 HOURS).  THE VALVE STEM ENDS WERE THE ROCKER ARM CONTACTS, THE VALVES WERE WORN EXCESSIVELY.  THE VALVES WERE PITTED AND CONCAVE.

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