SDR 98ZZZX3443

Service difficulty report · Valve · Cessna 421B

Difficulty date: September 4, 1998
Submitted: March 26, 2000
Operation: General aviation
Aircraft: N678DB
Make and model: Cessna 421B
Aircraft serial: 4210876
Engine: Cont GTSIO520H
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Valve
Part number: TCM539988
Condition: Mismanufactured
Location: Rt Eng Intake
Part time: 359 hours
Stage of operation: IN
Nature of condition: W
Precautionary procedure: K

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

What was found

DURING A PHASE INSPECTION, FOUND RIGHT ENGINE NR 5 CYLINDER LOW COMPRESSION 20/80, LEAKING BY INTAKE VALVE. REMOVED CYLINDER AND FOUND INTAKE VALVE HAD APPROXIMATELY .005 INCH RIDGE COMPLETELY AROUND VALVE ABOVE SEAT. SUSPECT VALVE WAS NOT PROPERLY HARDENED DURING MANUFACTURING PROCESS.

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