# SDR 2009FA0000975

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 29, 2009
- Submitted: November 20, 2009
- Operation: General aviation
- Aircraft: [N453ER](https://openairdocs.org/aircraft/N453ER), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S10500
- Engine: Lyc IO360L2A
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Bushing
- Part number: 66610
- Condition: Inaccurate
- Location: Nr 4 Cyl Rocker
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2009FA0000975

## Discrepancy

CYLINDER NR 4 ROCKER SHAFT BUSINGS IMPROPER INTERFERENCE FIT WITH ROCKER SHAFT.  DEFECT FOUND DURING DISASSEMBLY PHASE OF OVERHAUL WHILE ATTEMPTING TO REMOVE ROCKER SHAFT FROM CYLINDER.  PROBABLE CAUSE IS IMPROPER MFG.  (K)

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