O.S. Engines 108FSR User Manual
It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-6 of this booklet and to strictly
adhere to the advice contained therein.
Also, please study the entire contents of this
●
instruction manual, so as to familiarize yourself
with the controls and other features of the
engine.
●
Keep these instructions in a safe place so that
you may readily refer to them whenever
necessary.
It is suggested that any instructions supplied
●
with the aircraft, radio control equipment, etc.,
are accessible for checking at the same time.
CONTENTS
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S.
ENGINE
INTRODUCTION,
BEFORE INSTALLING THE ENGINE
BASIC ENGINE PARTS
INSTALLATION OF THE ENGINE
THROTTLE LINKAGE, SILENCER
FUEL T ANK LOCATION
GLOWPLUG
FUEL,PROPELLERS
CARBURETOR CONTROLS
STARTING
2~6
8~9
10
11
11~12
12~13
13~14
~
15
14
RUNNING-IN (Breaking-in)
IDLING ADJUSTMENT CHART
MIXTURE CONTROL VALVE ADJUSTMENT
7
SUBSEQUENT STARTING PROCEDURE
SUBSEQUENT READJUSTMENT
CARBURETOR CLEANLINESS,
ENGINE CARE AND MAINTENANCE
ENGINE EXPLODED VIEWS &
ENGINE PARTS LISTS
CARBURETOR EXPLODED VIEWS
& PARTS LISTS
ENGINE THREE VIEW DRAWINGS
GENUINE O.S. PARTS & ACCESSORIES
1
15
22
~
17
18
19
20
21
~
23
24
25
26
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
Remember that your engine is not a "toy", but a highly efficient internalcombustion machine whose power is capable of harming you, or others, if it is
misused.
As owner, you, alone, are responsible for the safe operation of your engine, so act
with discretion and care at all times.
If at some future date, your O.S. engine is acquired by another person, we would
respectfully request that these instructions are also passed on to its new owner.
The advice which follows is grouped under two headings according to the
degree of damage or danger which might arise through misuse or neglect.
WARNINGS
These cover events which
might involve serious (in
extreme circumstances, even
fatal) injury.
NOTES
These cover the many other
possibilities, generally less obvious
sources of danger, but which, under
certain circumstances, may also
cause damage or injury.
2
WARNINGS
Never touch, or allow any object to come
•
into contact with, the rotating
propeller and do not crouch
over the engine when it is
running.
A weakened or loose propeller may
•
disintegrate or be thrown off and, since
propeller tip speeds with powerful
engines may exceed 600 feet(180 metres)
per second, it will be understood that
such a failure could result in serious
injury, (see 'NOTES' section relating to
propeller safety).
Model engine fuel is poisonous. Do not
•
allow it to come into contact with the eyes
or mouth. Always store it in a
clearly marked container and
out of the reach of children.
Model engine fuel is also highly
•
flammable. Keep it away from open flame,
excessive heat, sources of sparks, or
anything else which might ignite
it. Do not smoke or allow anyone
else to smoke, near to it.
•
Never operate your engine in an enclosed space. Model engines, like automobile engines, exhaust deadly carbonmonoxide. Run your engine only in an
open area.
Model engines generate considerable
•
heat. Do not touch any part of your
engine until it has cooled. Contact with
the muffler (silencer),
cylinder head or exhaust
header pipe, in particular,
may result in a serious burn.
3
NOTES
This engine was designed for model
•
aircraft. Do not attempt to use it for any
other purpose.
Mount the engine in your model securely,
•
following the manufacturers' recommendations, using appropriate screws and locknuts.
Be sure to use the silencer (muffler)
•
supplied with the engine. Frequent
exposure to an open exhaust may
eventually impair your hearing.
Such noise is also likely to cause
annoyance to others over a wide area.
If you remove the glowplug from the engine
•
and check its condition by connecting the
battery leads to it, do not hold the plug with
bare fingers.Use an appropriate tool or a
folded piece of cloth.
Install a top-quality propeller of the
•
diameter and pitch specified for the engine
and aircraft. Locate the propeller on the
shaft so that the curved face of the blades
faces forward-i.e. in the direction of flight.
Firmly tighten the propeller nut, using the
correct size wrench.
4
NOTES
Always check the tightness of the propeller
•
nut and retighten it, if necessary, before
restarting the engine, particularly in the
case of four-stroke-cycle engines. If a
safety locknut assembly is provided with
your engine, always use it. This will prevent
the propeller from flying off in the event of a
"backfire", even if it loosens.
If you fit a spinner, make sure that it is a
•
precision made product and that the slots
for the propeller blades do not cut into the
blade roots and weaken them.
Preferably, use an electric starter. The
•
wearing of safety glasses is also strongly
recommended.
Discard any propeller which has become
•
split, cracked, nicked or otherwise rendered
unsafe. Never attempt to repair such a
propeller: destroy it. Do not modify a propeller
in any way, unless you are highly experienced
in tuning propellers for specialized
competition work such as pylon-racing.
Take care that the glow plug clip or battery
•
leads do not come into contact with the
propeller. Also check the linkage to the
throttle arm. A disconnected linkage could
also foul the propeller.
After starting the engine, carry out any
•
needle-valve readjustments from a safe
position behind the rotating propeller. Stop
the engine before attempting to make other
adjustments to the carburetor.
5
NOTES
Adjust the throttle linkage so that the engine
•
stops when the throttle stick and trim lever
on the transmitter are fully retarded.
Alternatively, the engine may be stopped by
cutting off the fuel supply. Never try to stop
the engine physically.
Take care that loose clothing (ties, shirt
•
sleeves, scarves, etc.)do not come into
contact with the propeller.Do not carry loose
objects (such as pencils, screwdrivers, etc.)
in a shirt pocket from where they could fall
through the propeller arc.
Do not start your engine in an area
•
containing loose gravel or sand.
The propeller may throw such material in
your face and eyes and cause injury.
For their safety, keep all onlookers
•
(especially small children) well back (at
least 20 feet or 6 meters) when preparing
your model for flight. If you have to carry
the model to the take-off point with the
engine running, be especially cautious.
Keep the propeller pointed away from you
and walk well clear of spectators.
Warning! Immediately after a glowplug-
•
ignition engine has been run and is still
warm, conditions sometimes exist whereby
it is just possible for the engine to abruptly
restart if the propeller is casually flipped
over compression WITHOUT the glowplug
battery being reconnected. Remember this
if you wish to avoid the risk of a painfully
rapped knuckle!
6
INTRODUCTION
This engine is ideally suited to a variety of R/C
•
aircraft,including sports and scale types.
A separate precision-made needle-valve unit is
•
installed at the rear, where manual adjustment is
safely remote from the rotating propeller.
An effective low-loss 855 silencer is supplied.
•
BEFORE INSTALLING THE ENGINE
In addition to the general tools, the following tools are
convenient to use.
•
10mm wrench to secure nuts, preferably 2 pcs.
14-17mm open end wrench
•
Large capacity electric starter and battery
•
Installing the glowplug
Carefully insert plug, with
washer, fingertight only,
before final tightening with
the correct size plug wrench.
Glow plug
Washer
Installing the remote needle
Install the remote needle to the attachment bracket
•
as shown in the following.
First, make sure that nut A and B are secured using
•
a 10mm wrench. Then, fit the remote needle to the
attachment bracket, and tighten nut A and C.
C
B
A
Remote Needle
Remote Needle Valve Bracket
Connect the needle-valve to carburettor jet nozzle with
silicone tubing supplied. In the event of the tubing
becoming damaged, it should be replaced with 78mm
length of 5mm ODx2mm ID silicone tubing.
7
BASIC ENGINE PARTS
Cylinder Head
Glow plug
INSTALLATION OF THE ENGINE
Installation in the model
A typical method of beam
mounting is shown below, left.
Carburettor
Type 7D-RN
Propeller Nut
Crankshaft
Drive Hub
Propeller Washer
Lock Nut
Silicone tubing
Fuel inlet
Crankcase
Remote Needle
Fuel outlet
Cover Plate
Rigid hardwood
(e.g. maple)
At least
12mm(1/2")
O.S. radial motor mount
(Available as an optional extra part. See parts list)
At least
12mm(1/2")
For 108FSR(BX-1) (Code No. 71907000)
8
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