# SDR 2013FA0000450

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 13, 2013
- Submitted: August 9, 2013
- Operation: General aviation
- Aircraft: [N51RX](https://openairdocs.org/aircraft/N51RX), registered now
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft serial: 421C0871
- Engine: Cont GTSIO520L
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Stud
- Condition: Cracked
- Location: Cylinder
- Stage of operation: IN
- How discovered: D
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2013FA0000450

## Discrepancy

ENGINE RUNNING ROUGH UNDER POWER AND NR 5 CYLINDER MONITOR COOLER THAN THE REST.  DURING INSPECTION,  FOUND FOUR CYLINDER STUDS MISSING AND A GAP BETWEEN CYLINDER BASE AND CRANKCASE.  PERFORMED A DYE PENETRATE CHECK ON CASE AND FOUND A CRACK ON FWD TOP STUD.

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