Overview
During a test flight conducted after the overhaul of both engines, the rear engine failed while the aircraft was on the downwind leg. The pilot secured the failed engine and attempted to feather the propeller, but the propeller would not feather.
Precautionary Approach and Landing
While executing a precautionary approach, the pilot overflew an available runway and subsequently overshot the intended landing runway. The aircraft then landed in a runup area adjacent to the runway, characterized by a high rate of descent. It came to rest in a grass area located between the runway and the taxiway.
Damage and Injuries
The aircraft sustained substantial damage. The pilot and passenger were not injured.
Engine Failure Cause
Investigation revealed that the engine failed because the oil dilution line was connected to the pressure port on the oil pump instead of the vacuum port. Additionally, the maintenance instructions did not provide guidance for the installation of the oil dilution line.