What happened
The pilot reported experiencing an engine problem while in flight. In response to the mechanical issue, the pilot attempted to perform a forced landing on a nearby highway. During the landing roll, the airplane rolled into a gully, resulting in substantial damage to a wing.
The investigation
Preliminary inspection by FAA inspectors revealed that number 3 and number 4 cylinders could not be removed due to barrel damage. Number 4 piston did not move when the crankshaft was rotated, and extensive metal particles were evident within the crankcase. The connecting rod was determined to have failed.
Findings
The engine failure was caused by a connecting rod failure. This mechanical issue led to substantial damage to the aircraft's wing during the subsequent forced landing.