O.S. engine GF40U-FI User manual

2021.08.01
O.S. ENGINES MFG. CO., LTD.
4 stroke gasoline engine for UAV
GF40U-FI
With EC11 (ECU)
INSTRUCTION MANUAL
version 2.46E

6-15 3-Chome Imagawa Higashisumiyoshi-ku
Osaka 546-0003, Japan
TEL.[phone]
FAX.[phone]
http://www.os-engines.co.jp
・Recommended propellers are 18x6-12，19x6-10，20x6-8 (DxP Inch). We recommend a propeller whose
rpm is within range of 7500rpm～9000rpm at full throttle.
・Start the engine with a safety stick or an electric starter (recommendation for safety reason).
・Periodical inspection after 50, 100 hours are necessary. Follow the maintenance manual, which is
separately provided.
About the engine
1
・The engine is equipped with electronic fuel injection system to correspond to environmental changes
during a long flight.
・This is a four stroke gasoline engine, but runs on a premixed gasoline/2-stroke engine oil.
・Use high quality commercially available 2-stroke engine oil.
・Follow the oil manufacturer's recommedation concerning the mixture ratio of gasoline and oil. In case
of no recommendation by manufacturer, use a 30 : 1 gasoline-to-oil mixture.
・The engine runs counter-clockwise when viewed from the front.
*The specifications are subject to alteration for improvement without notice.
*Consult us for any questions on this product and return for repair.

1
2
3
4
5
6
8
7
9
Rocker cover
Cylinder head
Drive pulley
Drive hub
Propeller washer
Propeller nut
Lock nut
Crankshaft
Driven pulley
Intake manifold
Cylinder
Connector (Injector)
Intake air temperature sensor
Air inlet
Engine bracket
Mounting plate(R)
Mounting plate(F)
Crankcase
Crankshaft rotation sensor
Generator support (R)
OGR-100A Generator
Generator support (F)
10
18
19
20
21
22
16
Names of the parts
22
．
1
．
12
11
13
14
15
17
16
．
17
．
18
．
19
．
20
．
21
．
10
．
2
2
．
3
．
4
．
5
．
6
．
7
．
8
．
9
．
12
．
13
．
14
．
15
．
11
．

Injector
Throttle valve
Injector coupler
Manifold pressure sensor
Throttle servo
Throttle linkage rod
Spark plug (CM-6)
Cylinder head temperature sensor
F-6040 Silencer
Generator mount
Reinforcement beam
Engine mount
32
．
33
．
28
30
31
32
33
34
27
28
．
29
．
30
．
31
．
29
23
24
25
26
Names of the parts
3
23
．
24
．
25
．
26
．
27
．
34
．

Engine control unit (ECU)
ECU connector [CN1]
ECU connector [CN2]
Status display LED
Fuel pump unit
Fuel pressure sensor unit
Pressure release valve
38
．
38
37
34
33
33
．
34
．
35
．
36
．
37
．
Names of the parts
4
39
．
35
36
39

Accessories
5
【Igniter】 Model:IG-08A
・The red connector is a power connector. Supply DC6V～12.6V
(MAX1A) for operation. The ignitor requires a separate power
source from that of the ECU. Install a power switch outsidfe of a
fuselage between Ignitor and power source for safety.
・
Connect the black connector to Ignition signal cable of ECU
【Spark plug】
・Screw into the engine's cylinder head.
・NGK CM-6 Spark plug.
・the hexagon size is 14mm.
・Tightening torque is 12N・m
【Fuel filter】【Non-bubble weight】
・Inline fuel filter to be used between a fuel tank and a pump. The
arrow mark shows the direction of fuel flow.
・Non-bubble weight to be used in a fuel tank to avoid air bubbles
in fuel line.
【Hose clamp】
・To be used to fix pressurized tubes to joints.
・Recommended tube: EIGHTRON Flexible Fluorine (ETFE) Resin
Tubing Clear made by HAKKO CORPORATION / JAPAN
Code No.28382303 FLUORINE(ETFE) RESIN TUBING (2m)
※
Be sure to use this tube where pressure is applied.
【Connector lock】
・For crankshaft rotation sensor，the power connector of Igniter，
and Ignition signal connector to prevent connectors from
disconnecting.
【Socket wrench (SST)】
・A special tool for attaching and detatching the temperature
sensors. (intake air temperature sensor and cylinder head
temperature sensor)
・Attach this tool to 1/4"(6.3mm) Socket wrench handle. (Socket
wrench handle is not included in this set)
【Serial signal converter】
・To be used to convert UART serial signal from ECU to RS-232C
serial signal when ECU is connected to a computer.
【Power supply code】
・Supply power.
・DC10V～17V(MAX1.5A)

6
Accessories
【CAN communication code】
・the connector for CAN communication

■
Cap screw (Hex socket head bolts)
※
Follow the above tightning torque unless otherwise specified.
Standard screw tightening torque
7
M5.0
7.2
screw size
N
・
m
M2.6
1.1
M3.0
1.5
M4.0
3.6

Installation
8
・Drill holes as shown above and bolt the engine to the firewall with standoff mounts and M5 bolts.
・Use standoff mounts with 18mm or more outer diameter made of A2017 aluminum or stronger
material.
・Use 25mm in length standoff mounts to be able to detatch the injector connector, to space the engine
from the fire wall.
・We recommend standoff mounts tobe within 25-30mm length.
Standoff mount
Firewall
Standoff mount

Threaded hole
Unthreaded hole
Unthreaded hole
Threaded hole
Installation
9
・Attach Mounting plate(R) to the Standoff mounts with M5x20 cap screws.
・There are two types of Engine brackets: Engine bracket A and B are different in direction of Engine
support bolts. Choose the proper engine bracker (A or B) to use on the Mounting plate (R) as shown
below.
Engine support bolt
Mounting plate (R)
Mounting plate(R)
Engine bracket
Standoff mount
M5x20 Bolt
Engine bracket A
Engine bracket B
Engine bracket B
Engine bracket A