D-MOTOR LF39 Bedienungsanleitung

The Light Weight Engine Houtekietstraat 11

B-8540 Deerlijk, Belgium

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D-MOTOR International © AIRCRAFT ENGINE

ENGINE OWNERS MANUAL

TYPE LF39 - 6 Cylinder Engine

Publication : LF39_2019_2

The Light Weight Engine Houtekietstraat 11

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Succession Notice

This manual is a revision of the previous manual published in 2013 and any revisons there of. Information within this document replace

the instructions of previous D-Motor International Publications –Engine Owners Manual.

Effective Changes for this manual / document

February 2019 V1

August 2019 (KGhekiere)

March 2019 V2 (KGhekiere)

Published and printed in Belgium by D-Motor International, bvba.

This material may not be reprinted, republished, broadcast, or

otherwise altered without the publisher's written permission. This manual is provided without

express, statutory, or implied warranties. The publisher will not be held liable for any damages

caused by or alleged to be caused by use, misuse, abuse, or misinterpretation of the contents.

Content is subject to change without notice. Other products and companies mentioned herein may

be trademarks of the respective owners.

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Inhoud 
Blank Page (intentional) 5 
INTRODUCTION 6 
D-MOTOR Engines 6 
SCOPE AND PURPOSE OF THIS DOCUMENT 6 
Warning 7 
Advisories 7 
Order of Precedence 8 
Updates/Changes Distribution 8 
Document revisions are released if the update changes more than 50% of the contents of a 
publication. Revisions replace the previous version of a publication from cover to cover. Minor 
corrections are released as change pages to the original publication, identified with a change 
number and effective change date in the page footer. Information on the page that changed from 
the previous edition is identified by a vertical, six-point black line referred to as a “change bar” in 
the outside margin of the page. A page change replaces only the previous edition of the affected 
page 8 
Suggestions and corrections 8 
Contact Information 9 
TOA (Table of Amandments) 10 
SAFETY INFORMATION 11 
MAIN SECTION 12 
Technical Sheet LF39 type D-Motor Engine 12 
Description 15 
Center Of Mass (CG) 20 
ASSEMBLY SHORT PROPELLOR FLANGE 21 
HANDLING OF THE ENGINE 21 
Motor START 21 
The handling of the motor is based on following elements 21 
After the pre-flight check and provided the propeller area is free the motor is started 22 
Motor STOP 23 
ENGINE Checking 23 
Emergency Procedures 25 
ECU ERROR MESSAGES 26 
Safety / Avoiding failures 27 

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Loss of Cooling liquid 27 
Oil Supply 28 
Throttle adjustments. 29 
Fuel Supply 30 
Important Information fuels and lubricants : 31 
Water Pump 32 
Power Supply 33 
Control and function test of the power supply 33 
Spark plugs 34 
Performance Curve of the LF39 Engine 36 
Periodic inspections 37 
First 25 & 50-hour-inspection 37 
100-hour-inspection or annually 37 
200-hour-inspection 38 
Preservation of the engine for long term storage 38 
Winter operation 38 
TROUBLE SHOOTING 39 
Engine does not fire 39 
Warm engine shows irregular idling 39 
Engine runs erratic or misfires occasionally 40 
Engine overheats, Oil temperature over 100 Deg.C (212 deg.F) 40 
The engine does not develop full power 41 
Low oil pressure 41 
The engine does not stop immediately 41 
Excessive oil consumption 42 
Engine « knocks » 42 
Engine hard to start at low temperatures 42 
OVERHAULS 43 
Major inspections at TBO 43 
Major repairs and major modifications 43 
Water and Oil 44 
Blank Page (intentional) 50 
 
 

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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.

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Warning

This is a non-certified aircraft engine ; the possibility of engine stoppage exists at all times. Do not

operate this engine over densely populated areas. Do not operate this engine over terrain where a

safe, power off landing cannot be performed.

The operation and maintenance instructions supplied with this engine must be followed at all times.

Flying any aircraft involves the risk of injury or death, building and maintaining your own aircraft

requires great personal responsibility.

Advisories

This document utilizes three types of advisories; defined as follows:

WARNING

A warning emphasizes information which, if disregarded, could result in severe injury to

personnel or equipment failure.

CAUTION

Emphasizes certain information or instructions, which if disregarded, may result in damage to

the engine or accessories.

NOTE

Provides special interest information, which may facilitate performance of a procedure or

operation of equipment.

Warnings and cautions precede the steps to which they apply; notes are placed in the manner which provides the greatest

clarity. Warnings, cautions, and notes do not impose undue restrictions. Failure to heed advisories will likely result in the

undesirable or unsafe conditions the advisory was intended to prevent. Advisories are inserted to ensure maximum safety,

efficiency, and performance. Abuse, misuse, or neglect of equipment can cause eventual engine malfunction or failure.

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Order of Precedence

WARNING

The aircraft operator must use the airframe manufacturer’s operating instructions found in the Airplane Flight Manual/

Pilot’s Operating Handbook (AFM/POH) while operating the aircraft unless the AFM/POH directs otherwise.

Updates/Changes Distribution

Document updates are available from our web site upon notification of official document approval.

Printed publication subscribers receive printed changes and revisions as they are released.

Document revisions are released if the update changes more than 50% of the contents of a

publication. Revisions replace the previous version of a publication from cover to cover.

Minor corrections are released as change pages to the original publication, identified with a change

number and effective change date in the page footer. Information on the page that changed from

the previous edition is identified by a vertical, six-point black line referred to as a “change bar” in the

outside margin of the page. A page change replaces only the previous edition of the affected page

Suggestions and corrections

D-Motor International solicits and encourages user comments regarding suggested changes to this

manual. Direct recommended changes or questions to the attention of “Publications” at the address

listed in this section, “Contact Information” or send comments via e-mail to [email protected]. Notify

our Customer Service Department immediately, using our telephone number, if you discover

incorrect information which adversely affects safety !! Thank you !!

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Contact Information

D-Motor International factory representatives are available to answer technical questions and

encourages suggestions regarding products, parts, or service. If customers have an inquiry or require

technical assistance, they should contact their local D-Motor dealer/distributor or field

representative. To contact a factory representative, refer to the contact information below:

D-Motor International, bvba

Houtekiestraat 11

B-8540 DEERLIJK

BELGIUM

Customer service department : +32 (0)56 498149

helpdesk@d-motor.eu https://www.d-motor.eu

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TOA (Table of Amandments)

Current N°

Chapter

Page

Change

date

Remark

Date

aproval

Date

inclusion

Signature

INTRO

Before operating the engine, carefully read this Operators Manual. The Manual provides you with

basic information on the safe operation of the engine. If any passages of the Manual are not clearly

understood or in case of any questions, please contact an D-Motor International® authorized aircraft

engines dealer/distributors or their independent service center. D-Motor International wishes you

much pleasure and satisfaction flying your aircraft powered by this D-Motor®-Aircraft engine.

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