SDR CA951114010

Service difficulty report · Roller

Difficulty date: August 17, 1995
Submitted: March 26, 2000
Operation: General aviation
Engine: Cont TSIO520NB
System (JASC): 8520 · Reciprocating Engine Power Section
Part: Roller
Condition: Damaged
Location: Nr5 Cheek Ctwt
Component: Cont
Stage of operation: IN
Nature of condition: O
Precautionary procedure: O

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

What was found

(CAN)ENGINE RECEIVED AT R&O DUE TO METAL CONTAMINATION. INSPECTION DURING TEARDOWN REVEALED ONE COUNTERWEIGHT ROLLER (#5 CHEEK) DISLODGED FROM COUNTERWEIGHT. COUNTERWEIGHT FOUND RETAINED TO CRANKSHAFT WITH ONLY ONE PIN. DISLODGED PIN HAD BECOME JAMMED BETWEEN ONE CONNECTING ROD AND THE CRANKCASE, CAUSING EXTENSIVE DAMAGE TO THE CONNECTING ROD AND CRANKCASE.