What was found
PILOT REPORTED THAT IN CRUISE THE RIGHT ENGINE MANIFOLD PRESSURE DROPPED 2 INCHES, THE OIL TEMPERATURE STARTED TO RISE WITH THE OIL PRESSURE REMAINING IN THE GREEN. CHART WAS WITHIN LIMITS, AT THIS POINT HE DECIDE TO DO A PRECAUTIONARY SHUT DOWN OF THE ENGINE. HE ATTEMPTED TO FEATHER, THE ENGINE APPARENTLY SEIZED AND THE PROP FEATHERED. THE A/C LANDED WITHOUT INCIDENT. IT APPEARS THAT EITHER NR 5 CYLINDER CONNECT ROD OR POSSIBLY THE CRANKSHAFT BROKE CAUSING THE ENGINE TO SEIZE. THE CYLINDER HAD STARTED TO SEPARATE FROM THE CASE, CRACKING IT THROUGH THE INTAKE/OIL SUMP ASSEMBLY AND THE ACCESSORY SECTION CASE WAS ALSO CRACKED . CAUSE OF THE FAILURE: TO BE DETERMINED AT BREAKDOWN BY THE MANUFACTURER.