Pilot Report
During cruise flight, the pilot experienced a rough-running engine accompanied by a very high oil temperature reading above the red line. Shortly thereafter, the engine ceased operation entirely. The pilot maneuvered for a landing in a bare field but observed workers in the touchdown area, necessitating a landing in a vineyard.
Post-Accident Examination
An initial on-site examination of the aircraft identified no discrepancies. Fuel was present in the tanks, lines, and carburetor. The engine crankshaft rotated normally. The aircraft was subsequently transported to an aircraft maintenance facility for further inspection.
Engine Inspection and Test
At the maintenance facility, no particles or debris were found in the oil strainer or sump. The left magneto timing measured 25 degrees, while the right magneto timing was 28 degrees. Using the aircraft's systems, the engine was started and operated for 15 minutes at idle, mid-range, and full power settings. Engine operation was normal, with oil pressures and temperatures remaining within normal ranges throughout the test.