# SDR 98ZZZX4461

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 21, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N961CC
- Make and model: Cessna 210N
- Registry model: [Cessna 210N](https://openairdocs.org/model/cessna-210n) (OpenAirDocs)
- Aircraft serial: 21064620
- Engine: Cont IO520L
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve Guide
- Part number: 653446
- Condition: Worn
- Location: Engine
- Part time: 850 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/98ZZZX4461

## Discrepancy

DURING A ROUTINE COMPRESSION CHECK, EXCESSIVE LEAKAGE PAST THE PISTON RINGS WAS FOUND ON THE THE NR 2 CYLINDER.  THE REMOVED CLYINDER WAS FOUND WORN OUT AND THE PISTON RINGS STUCK IN THE RING GROOVES.  SUBMITTER SUGGESTED POSSIBLE CAUSE AS EXCESSIVE LEAD SLUDGE BUILD-UP FROM THE USE OF TCM APPROVED MOBIL AV1 OIL.

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