The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 6
ALL 19-3-2019
INTRODUCTION
D-MOTOR Engines
D-Motor LF 26 4 cylinder and LF39 6 cylinder engines are direct drive 100% water cooled boxer side
valve engines. The engines incorporate multi-point fuel injection controlled by an advanced twin ECU
control system which is performance mapped with Lambda sensing.
A 300W/25A generator is fully integrated as standard fitment; the oil and coolant pumps are directly
driven by the camshaft. The fuel pressure is held at a constant level with a pressure regulator, which
is connected to the fuel recirculating system. Air inlet preheating is not required and not installed.
The entire motor is controlled and monitored by the ECU (Electronic Control Unit). A second ECU is
standard, battery and fuel pump can be installed as a redundant system.
D Motor aircraft engines are a Premium Quality European Product designed and produced in Belgium
https://www.d-motor.eu
SCOPE AND PURPOSE OF THIS DOCUMENT
This manual gives instruction and guidance for engine preparation, installation, and operation of the
LF26 and LF39 aircraft engines. The installation instructions within this manual are basic guidelines.
When installing the engine in the airframe, follow the airframe manufacturer’s installation
instructions. Refer to the D-Motor Engine Service and Installation manual for required maintenance
(service information) such as: oil changes, oil top up, oil filter replacement, routine time limited-
interval inspections, routine service, spark plug replacement/inspection procedures, cylinder
inspection, fuel system inspection, and scheduled servicing procedures. For airworthiness limitations,
guidelines to fault finding and for procedures to replace components, disassembley and re-
assembley of the engine, refer to the D-Motor Engine Maintenance Manual. For spare parts
information, refer to the D-Motor Illustrated Parts Catalog.
