# SDR 9BYR2014022000091

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 12, 2014
- Submitted: February 20, 2014
- Operation: General aviation
- Aircraft: [N6225X](https://openairdocs.org/aircraft/N6225X), registered now
- Make and model: Cessna 340A
- Registry model: [Cessna 340A](https://openairdocs.org/model/cessna-340a) (OpenAirDocs)
- Aircraft serial: 340A0688
- Engine: Cont TSIO520NB
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder Head
- Part number: 6566441
- Condition: Cracked
- Location: Nr 3
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9BYR2014022000091

## Discrepancy

PILOT STATED LOSS OF POWER/ROUGH RUNNING.  DURING INVESTIGATION FOUND CYLINDER NR 3 CRACKED FROM TOP SPARK PLUG HOLE TO EXHAUST VALVE.  CYLINDER NR 2 HEAD HAD SEPARATED FROM BARREL AND CRACKED FROM TOP SPARK PLUG HOLE TO EXHAUST VALVE ALSO.  CYLINDER NR 6 EXHAUST VALVE OVERHEATED AND MUSHROOMED, LOW COMPRESSION.  THEN FOUND CANKCASE CRACKED 3" IN FROM CYLINDER NR 6 TOP THRU-STUD AREA TOWARD CASE ALL THE WAY THROUGH INSIDE TO OUTSIDE.  ALL CYLINDERS ARE STEEL BARRELS .  ENGINE WAS MODIFIED IAW STC SE4327SW RAM ENGINE CONVERSION AT OVERHAUL.

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