SDR 97ZZZX415

Service difficulty report · Gasket

Difficulty date
December 20, 1996
Submitted
March 26, 2000
Operation
General aviation
Engine
Cont O470*
Part
Gasket
Part number
653191D
Condition
Deteriorated
Location
Valve Cover
Part time
2 hours
Stage of operation
IN
Nature of condition
W, K
Precautionary procedure
K

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

What was found

UPON USING A NEW SERIES VALVE COVER GASKET 653191D, FOUND THAT ALL OF THE GASKETS RECEIVED FROM THE VENDOR LEAKED. ALL OF THE GASKETS WERE FOUND TO DEVELOP AN AREA WHERE THE GASKET WAS LITERALLY FALLING APART. THERE DID NOT APPEAR TO BE ANY LONG FIBER MATERIAL IN THE FAILED SEGMENTS THAT WOULD PROVIDE A COHESIVE PRODUCT. THE SEGMENTS WOULD TOTALLY COLLAPSE WITH FINGER PRESSURE. SUBMITTER STATED THERE IS ENOUGH EVIDENCE TO SHOW THAT QUALITY CONTROL WAS NOT MAINTAINED DURING MANUFACTURE OF THESE GASKETS.