Service difficulty report · Connecting Rod

Difficulty date
July 24, 2001
Submitted
July 24, 2001
Operation
General aviation
Engine
Cont IO520C
Engine time
3 hours
Part
Connecting Rod
Part number
646778
Condition
Gouged
Location
Engine
Part time
3 hours
Stage of operation
IN
How discovered
V
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

FACTORY REBUILT ENGINE WITH 3.3 TTIS WAS BEING DISASSEMBLED FOR INSPECTION DUE TO A PROPELLER STRIKE. ONE OF THE #6 CONNECTING ROD BOLTS COULD NOT BE REMOVED WITH REASONABLE PRESSURE AND HAD TO BE DRIVEN OUT OF THE CAP. INSPECTION OF THE BOLT REVEALED THAT A BURR AND EVIDENCE OF GALLING HAD OCCURRED ON THE SHANK AT THE POINT WHERE ROD AND CAP PARTING SURFACES MEET. THE CAP WAS DAMAGED WITH SIGNIFICANT GOUGING WHERE THE BOLT HAD TO BE DRIVEN OUT LEAVING IT UNSERVICEABLE.