# SDR 20010412CW009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 1, 2001
- Submitted: April 12, 2001
- Operation: General aviation
- Aircraft: N515HW
- Make and model: Cessna 310J
- Registry model: [Cessna 310J](https://openairdocs.org/model/cessna-310j) (OpenAirDocs)
- Aircraft serial: 310J0102
- Engine: Cont IO470U
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Condition: Leaking
- Location: Lt Engine
- Stage of operation: IN
- How discovered: V
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20010412CW009

## Discrepancy

AIRCRAFT LANDED.  OIL LEAKING FROM LEFT ENGINE.  INSPECTION REVEALED NR 4 CYLINDER VALVE COVER BROKEN DUE TO VALVE ROCKER ASSEMBLY BROKEN FROM CYLINDER BOSS.  PROBABLE CAUSE STUCK VALVE OR METAL FATIGUE AT BOSS.

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