What was found
IN CRUISE FLIGHT PILOT REPORTED LOSS OF ENGINE OIL PRESSURE. ACFT LANDED IN A FIELD. VISUAL EXTERNAL EXAMINATION OF THE ENGINE REVEALED AN 8" SQUARE AREA OF THE BOTTOM OF THE CRANKCASE MISSING BY THE NR 1 AND NR 2 CYLINDERS. THE CONNECTING ROD FOR THE NR 1 CYLINDER WAS NOT CONNECTED, THE ROD CONNECTION BOLTS WERE IN PLACE BUT BROKEN. THE CRANKSHAFT JOURNAL DID NOT SHOW EVIDENCE OF DAMAGE. 1 OF THE NR 2 CYLINDER PUSH RODS WAS BENT.