Service difficulty report · Bearing · Piper PA31350

Difficulty date
October 15, 2001
Submitted
December 4, 2001
Operation
General aviation
Make and model
Piper PA31350
Engine
Lyc TIO540J2BD
Propeller
Hartzl HCE3YR2
Part
Bearing
Part number
640761A
Condition
Worn
Location
Reciprocating En
Component
Reciprocating En · Lyc · TIO540J2BD
Stage of operation
IN
Nature of condition
O
Precautionary procedure
K

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

What was found

(AUS) DURING LH ENGINE STRIP FOR REPAIR TO A CRACKED CRANKCASE, THE CENTRE MAIN BEARING WAS FOUND TO BE BADLY WORN AND THE LOCATING LUGS WERE BADLY DAMAGED. THE CRANKSHAFT WAS ALSO FOUND TO BEDAMAGED ON THE FORWARD AND REAR SURFACES CONTACTED BY THE BEARING DUE TO EXTREME LONGITUDINAL MOVEMENT OF THE BEARING. SEALANT WASFOUND ON THE BEARING WEBS. THE THROUGH STUD SEALING O'RINGS BETWEEN THE CRANKCASE HALVES WERE MISSING. TO STOP THE OIL LEAK SILK THREAD AND LOCTITE 515 WAS AROUND THE THROUGH BOLT HOLES. NON-APPROVED REPAIR. PERSONNEL/MAINTENANCE ERROR.

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