What was found
DURING CRUISE PHASE OF FLIGHT, WHILE DEPARTING TRAFFIC PATTERN, AIRCRAFT EXPERIENCED SEPARATION FAILURE OF CRANKSHAFT WITH RESULTING LOSS OF PROPELLER, LOSS OF OIL AND SUBSEQUENT ENGINE FAILURE. ENGINE SPEED APPROX. 3100 RPM, 3700 FT MSL, AIRSPEED APPROX 104 MPH. FAILURE OCCURRED APPROXIMATELY 10 INCHES BEHIND PROPELLER AND AFT OF THE FRONT BEARING. CRANKSHAFT FAILED DIAGONALLY WITH APPROXIMATE 45 DEGREE BREAK. PROPELLER AND CRANKSHAFT STUB DEPARTED CLEANLY WITH NO RESULTING DAMAGE TO AIRFRAME.