What was found
(CAN) DURING AG OPERATIONS THE ENGINE FAILED AND OIL ON THE WIND SCREEN FORCED THE PILOT TO MAKE A FORCED LANDING IN A FIELD. POST FLIGHT INSPECTION FOUND THE PROPELLER GOVERNOR DRIVE GEAR HAD SHEARED RADIALLY AND SPUN OUT OF CONTROL CAUSING MASSIVE DAMAGE TO THE DRIVE HOUSING. OIL EXITED THE HOUSING AND COVERED THE WIND SCREEN CAUSING LOSS OF VISIBILITY FORCING THE LANDING.