Incident Overview
During a flight near Tok, Alaska, the engine oil pressure began to drop and the oil temperature began to rise. Before the pilot could return to Tok, the engine stopped producing power and would not windmill.
Forced Landing
The airplane was forced to land on muskeg terrain. During the landing roll, the airplane nosed over.
Engine Examination
Disassembly of the engine revealed that the number 6 cylinder piston pin cap was missing. The number 6 cylinder connecting rod cap was fractured into three major pieces. All bearing surfaces showed signs of heat damage.
Findings
The engine failure resulted in a forced landing with a subsequent nose-over on soft ground.