# SDR 95ZZZX3471

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 26, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N3143A](https://openairdocs.org/aircraft/N3143A), registered now
- Make and model: Cessna 170B
- Registry model: [Cessna 170B](https://openairdocs.org/model/cessna-170b) (OpenAirDocs)
- Aircraft serial: 25787
- Engine: Cont C1452
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Condition: Failed
- Location: Nr 3 Exhaust
- Stage of operation: IN
- Nature of condition: E, R
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95ZZZX3471

## Discrepancy

STUDENT PILOT REPORTED ENGINE RAN ROUGH ON RUN-UP.  FOUND NR 3 EXHAUST VALVE STUCK OPEN.  ALSO, FOUND INTAKE ROCKER ARM (WITH NO OIL ORIFICE) INSTALLED ONE EXHAUST SIDE - POSSIBLY CONTRIBUTING TO STUCK VALVE.  SEE CONT SB M77-19.  OTHER AIRCRAFT HAVE BEEN FOUND WITH ROCKER ARMS INCORRECTLY INSTALLED, NOT UNUSUAL.

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