# SDR 98ZZZX3557

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 18, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N4860A](https://openairdocs.org/aircraft/N4860A), registered now
- Make and model: Piper PA-22-150
- Registry model: [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150) (OpenAirDocs)
- Aircraft serial: 224019
- Engine: Lyc O320A2B
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Pushrod Spring
- Part number: LW13428
- Condition: Broken
- Location: Cylinder Head
- Part time: 150 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/98ZZZX3557

## Discrepancy

PILOT NOTED THE ENGINE WOULD MISS THEN RUN.  PILOT MADE PRECAUTIONARY LANDING.  THE VALVE COVER ON CYLINDER NR 2 HAD A HOLE IN IT.  INVESTIGATION SHOWED THE PUSHROD TUBE SPRING LYC P/N LW14995 BROKE AND SEPARATED AT THE HOLE FOR THE HOLD-DOWN STUD.  THE BROKEN PART JAMMED BETWEEN THE VALVE COVER AND THE INTAKE VALVE CAUSING THE ENGINE TO MISS.  INSPECTION OF THE REMAINING 3 CYLINDERS REVEALED ALL 4 OF THE LW13428 LOCKPLATES WERE CRACKED OR BROKEN.  THE PARTS HAD A TT OF 150 HRS AND WERE PLACED IN SERVICE 3-14-94.  THIS INVESTIGATION IS ONGOING.

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