# SDR 98ZZZX990

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N88604](https://openairdocs.org/aircraft/N88604), registered now
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft serial: 421C0604
- Engine: Cont GTSIO520L
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Bolt
- Part number: 537750
- Condition: Failed
- Location: Nr 5 Cyl Rocker
- Part time: 1,500 hours
- Component: 654654A1
- Stage of operation: IN
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98ZZZX990

## Discrepancy

PILOT REPORTED OIL LEAKING FROM RIGHT ENGINE.  FOUND HOLE IN NR 5 CYLINDER ROCKER COVER.  HEAD OF BOLT BROKE OFF THAT ATTACHES ROCKER ARM AND SHAFT TO CYLINDER ASSEMBLY.  NEW BOLTS INSTALLED AND NEW ROCKER COVER.

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