SDR 95ZZZX585

Service difficulty report · Valve

Difficulty date: January 13, 1995
Submitted: March 26, 2000
Operation: General aviation
Engine: Cont IO520BA
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Valve
Part number: 646283
Condition: Excess Wear
Location: Cylinder
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

INSPECTION FOUND 2 EACH, PN 646283, VALVES OUT OF A FACTORY REMANUFACTURED ENGINE WITH TEST CELL BREAK-IN TIME ONLY. (LESS THAN 3 HOURS). THE VALVE STEM ENDS WERE THE ROCKER ARM CONTACTS, THE VALVES WERE WORN EXCESSIVELY. THE VALVES WERE PITTED AND CONCAVE.