Service difficulty report · Stud · Piper PA31350

Difficulty date
April 5, 2001
Submitted
May 3, 2001
Operation
Air carrier
Aircraft
N792FC
Make and model
Piper PA31350
Aircraft serial
317552108
Engine
Lyc LTIO540J2BD
Part
Stud
Part number
5015
Condition
Leaking
Location
Rt Engine
Stage of operation
IN
How discovered
V
Nature of condition
K
Precautionary procedure
K

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

What was found

DURING INSPECTION EXCESSIVE OIL WAS OBSERVED IN BOTTOM OF COWLING OF RIGHT ENGINE. THE LEAK WAS TRACED TO THE TWO FORWARD HOLD DOWN STUDS OF NR 2 CYLINDER. NOTE THESE ARE NOT THRU STUDS. THE CYLINDER WAS REMOVED AND OIL OBSERVED LEAKING FROM AROUND THE THREADS. THE STUDS WERE REMOVED BREAKING TORQUE WAS 8FT LBS. STUDS WERE REINSTALLED TO SPECS BUT STUD HEIGHT WAS INCORRECT. OVER SIZE STUDS WERE INSTALLED TO SPECS. RUN UP AND LEAK CHECK GOOD. UNABLE TO DETERMNE IF CASE OR STUDS CAUSED LEAKS.

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