# SDR 96ZZZX5956

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 12, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Western Aircraft Inc, repair station FE6R532N](https://openairdocs.org/faa-repair-station/FE6R532N/western-aircraft-inc.md) (OpenAirDocs)
- Aircraft: N717CM
- Make and model: Cessna TU206G
- Registry model: [Cessna TU206G](https://openairdocs.org/model/cessna-tu206g) (OpenAirDocs)
- Aircraft serial: U20604988
- Engine: Cont TSIO520M
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Part number: 653446
- Condition: Leakage
- Location: Nr 1 Cyl Exh
- Part time: 40 hours
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX5956

## Discrepancy

ENGINE HAS 40.0 HRS SINCE MAJOR OVERHAUL AT WHICH TIME NEW TCM CYLINDERS WERE INSTALLED.  COMPRESSION CHECK SHOWS NR 1 CYLINDER AT 40/80 LEAKING THROUGH EXHAUST VALVE AND CYLINDERS NR 2, 3, 5, AND 6 TO BE AT 70/80 WITH SLIGHT EXHAUST VALVE LEAKAGE.  BORESCOPE INSPECTION SHOWS NR 1 CYLINDER TO HAVE A VERY NARROW EXHAUST VALVE SEAT WITH LIGHT CONTACT.  COMPRESSION READINGS ON THE ABOVE CYLINDERS ARE OUTSIDE THE LIMITS SPECIFIED IN TCM SB M84-15, DATED DEC 21, 1984.

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