# SDR 97ZZZX1133

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 25, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N36MV
- Make and model: Hiller UH-12E
- Registry model: [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e) (OpenAirDocs)
- Aircraft serial: 5060
- Engine: Lyc VO540C2A
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Condition: Not To Spec
- Location: Flange
- 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/97ZZZX1133

## Discrepancy

DURING ASSEMBLY OF ENGINE, MEASURED DRY TAPPET CLEARANCE FROM .107 INCH TO .187 INCH.  LYC OHM REQUIRES .028 INCH TO .080 INCH.  RETURNED 6 CYLINDERS TO EC/SW WHERE THEY CUT/REMOVED MATERIAL FROM THE CYL FLANGE.  CYLINDERS WERE RE-INSTALLED.  THESE CYLINDERS JUST MADE THE .080 INCH DTC USING THE LONGEST PUSH ROD AND NEW ROCKER ARMS.

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