Incident Overview
During a cruise flight at 2000 feet MSL, the pilot reported that the oil temperature and pressure gauges suddenly indicated zero. He checked along the sides of the airplane for any evidence of oil but saw none. Believing it might be an indication problem, he elected to return to the airport. Within two minutes of the zero indication, the engine started to vibrate violently. The pilot stated there was no suitable place for a forced landing, so he landed in a plowed field and collided with trees during the landing.
Examination Findings
The engine was removed for further examination, which included the removal of the oil sump and accessory case. When the oil sump was removed, there was evidence of bearing material in the sump and also water in the oil that was drained out of the oil hoses. The connecting rod on the number one cylinder separated at the large end, resulting in the piston being jammed in the cylinder.
Probable Cause
The investigation did not establish a probable cause for the engine failure.