What was found
WHILE ON APPROACH TO AIRPORT, THE PILOT NOTICED MANIFOLD PRESSURE DROPPING AS WELL AS OIL PRESSURE FROM THE RIGHT ENGINE. HE ALSO BEGAN TO FEEL A VIBRATION FROM THE SAME ENGINE. HE ELECTED TO SHUT THE ENGINE DOWN AND MADE AN UNEVENTFUL LANDING. UPON INSPECTION, THE NR 5 CYLINDER HOLD DOWN STUDS HAD SHEARED AND ALLOWED THE CYLINDER TO HAMMER AGAINST THE ENGINE CASE AND COWLING. THIS IN TURN RIPPED THE RT EXHAUST STACK FROM THE NR 1 AND NR 5 CYLINDERS CAUSING HEAT DISTRESS AT THE COWL DOOR.