# SDR 2007FA0000637

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 13, 2007
- Submitted: July 19, 2007
- Operation: General aviation
- Aircraft: [N1858X](https://openairdocs.org/aircraft/N1858X), registered now
- Make and model: Cessna 182H
- Registry model: [Cessna 182H](https://openairdocs.org/model/cessna-182h) (OpenAirDocs)
- Aircraft serial: 18255958
- Engine: Cont O470R
- Propeller: Mcauly 2A34C66
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Piston
- Part number: SA640518
- Condition: Fractured
- Location: Nr1 Cylinder
- Component: Cylinder
- Component part number: SA47006SA20P
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007FA0000637

## Discrepancy

AFTER INSTALLING NEW CYLINDER ASSY SA47006S-A20P WITH NEW PISTON ASSY PN SA640518, WE WERE PERFORMING BREAK IN RUN AT LOW POWER, FIRST AT 800 RPM FOR 2 MIN.  SHUTDOWN ENGINE, CLEANED FOULED PLUGS DUE TO OIL IN CYLINDER FROM ASSY.  RAN ENGINE AT 1000 RPM FOR 3 MIN.  SHUTDOWN AND CLEANED SPARK PLUGS AGAIN.  RESTARTED ENGINE AND ADVANCED TO 1200 RPM, THE CYLINDER CLEARED OUT AND THEN STOPPED AFTER A FEW SECONDS.  AFTER REMOVING THE OIL PAN AND NR 1 CYLINDER THE PISTON APPEARED TO HAVE FRACTURED ALONG A CASTING FAULT IN THE PISTON PIN BOSS.  THE RESULTING DEBRIS BENT THE CAM SHAFT, BROKE BOTH CRANKSHAFT HALVES.  (K)

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