SDR 97ZZZX3844

Service difficulty report · Seal · Amtr SEAREY

Difficulty date: July 30, 1997
Submitted: March 26, 2000
Operation: General aviation
Aircraft: N7475Q
Make and model: Amtr SEAREY
Aircraft serial: 1DK028
Engine: Rotax ROTAX912
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Seal
Condition: Failed
Location: Nr 3 Cyl Exh Vlv
Part time: 32 hours
Stage of operation: NR
Nature of condition: E, R
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

NUMEROUS PILOT LOG BOOK REPORTS OF A ROUGH RUNNING ENGINE. ATTEMPTS TO CORRECT BY REPLACING SPARK PLUGS, LEADS, FUEL FILTER, ETC., DID NOT CORRECT PROBLEM. INVESTIGATION DISCLOSED THAT BOTH SPARK PLUGS IN NR 3 CYLINDER WERE OIL SOAKED. IT APPEARED THE EXHAUST VALVE STEM SEAL ON NR 3 CYLINDER HAD FAILED.