O.S. Engines 46AX 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.
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE
INTRODUCTION,
BEFORE INSTALLING THE ENGINE
BASIC ENGINE PARTS
NEEDLE-VALVE LOCATION
INSTALLATION OF THE ENGINE
THROTTLE LINKAGE
SILENCER
FUEL TANK LOCATION
GLOWPLUG
FUEL, PROPELLERS
MIXTURE CONTROLS
BEFORE STARTING
CONTENTS
2-6
9-10
10
11
12
13
14-15
15
16-17
STARTING
RUNNING-IN (Breaking-in)
IDLING ADJUSTMENT CHART
7
MIXTURE CONTROLVALVE ADJUSTMENT,
REALIGNMENT OF MIXTURE CONTROL
8
VALVE
SUBSEQUENT STARTING PROCEDURE
SUBSEQUENT READJUSTMENT
CARBURETOR CLEANLINESS,
ENGINE CARE AND MAINTENANCE
ENGINE EXPLODED VIEWS &
ENGINE PARTS LISTS
CARBURETOR EXPLODED VIEWS
& PARTS LISTS
O.S. GENUINE PARTS & ACCESSORIES
ENGINE THREE VIEW DRAWINGS
MEMO
1
17-18
19-21
22
23
24
25
26-27
28
29-30
31
32
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.
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.
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
Model engine fuel is also highly
flammable. Keep it away fr om open flame,
excessive heat, sources of sparks, or
anything else which might ignite
it. Do not smoke or allow any one
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 glowplugignition 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 trainer, sports, aerobatic 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.
The needle-valve assembly can be installed either
horizontally or vertically.
Standard accessories
Glow Plug A3
E-3010 Silencer Assembly
Silicone Tube
Instruction Manual
Note :
With these engines, the piston will feel tight at the
top of its stroke when the engine is cold. This is
normal. The piston and cylinder are designed to
achieve a perfect running clearance when they
reach their intended running temperature.
BEFORE INSTALLING THE ENGINE
Installing the glowplug
Carefully insert plug, with
washer, fingertight only, before
final tightening with the correct
size plug wrench.
Connecting fuel tubing
Connect the short length of fuel tubing (supplied)
securely between the needle-valve outlet and
carburetor inlet as shown in the illustration on the next
page.
In the event of the tubing becoming damaged, it
should be replaced with 54-56mm length of 5mm
ODx2mm ID silicone tubing. Use similar material to
connect the fuel inlet nipple to the fuel tank.
7
Glow plug
Washer
BASIC ENGINE PARTS
Cylinder head
Carburetor
Throttle
Lever
Crankshaft
Fuel inlet
Drive Hub
Propeller washer
Propeller nut
Glowplug
Crankcase
Fuel inlet
Needle valve
Fuel outlet
Cover Plate
Silicone T ube
Beam Mount
NEEDLE-VALVE LOCATION
The procedure for relocating the needle-valve is as
follows:
Remove the two cover-plate screws which secure
1.
the needle-valve assembly bracket, then carefully
remove the two screws by which the needle-valve
unit is attached to the bracket.
Rotate the needle-valve unit through 90˚ and re-
2.
attach it to the bracket in the required position (see
sketch right).
Note:
As self-tapping screws are used for unit
attachment, screw them in carefully so that screw
threads match those of the unit body precisely.
Finally, secure the complete assembly to rear cover
3.
plate as before.
Cover plate Retaining Screw
Cover plate fitting holes
Needle-Valve
Assembly Bracket
Needle Valve unit
attachment screws
8
Needle Valve unit
Vertical position
(Factory position)
INSTALLATION OF THE ENGINE
Installation in the model
A typical method of beam
mounting is shown below, left.
Rigid hardwood
(e.g. maple)
At least
15mm(5/8")
O.S. radial motor mount
For 46AX, 50SX, 40/46FX (Code No. 71913100)
At least
15mm(5/8")
O.S. radial motor mount
(Available as an optional extra
part. See parts list)
Make sure that the mounting beams are parallel and
that their top surfaces are in the same plane.
CORRECT
Front view
Top surfaces are in the same plane.
Side view
INCORRECT
Top surfaces are not
in the same plane.
Re-align the surfaces
as necessary
Opposite
beam
Top surfaces are not
in the same plane.
Engine does not rest firmly.
9
How to fasten the mounting screws.
Hardwood mounting beams
3mm steel nuts
Spring washer or
lock washer
3mm steel screw
O.S. radial motor mount
(cast aluminum)
Tighten second nut firmly down
onto first nut.
Tighten this nut first.
Hardwood such
as cherry or maple.
Steel washer
3.5mm steel Allen screw
Spring washer
THROTTLE LINKAGE
Before connecting the throttle-lever/ servo linkage,
make sure that no part of the linkage interferes with
the internal structure of the aircraft or wiring, etc.,
when the throttle is fully open or fully closed.
Set the throttle lever linkage so that the throttle rotor is (a) fully open when the transmitter throttle
stick is fully advanced and (b) fully closed when
the throttle stick is fully retarded.
Adjustment of the throttle rotor opening at the idling
position can then be made with the throttle trim lever on the transmitter.
(Select throttle-lever and servo-horn hole positions
that will avoid excessive pushrod travel causing the
throttle to bind at either end.)
Throttle Lever Fixing Screw
Note:
When adjusting the throttle lever angle, relative to
the rotor,hold the rotor at about half-way between
the open and closed positions while loosening
and tightening the fixing screw, otherwise the
rotor, rotor guide screw,throttle stop screw or
carburettor body may become burred and
damaged.
10
SILENCER
Secure the silencer to the engine by means of two
fitting screws supplied after the engine is securely
fixed to a test bench or a model.
The exhaust outlet of the silencer can be rotated to
any desired position in the following manner:
1)
Loosen the locknut and assembly screw.
2)
Set the exhaust outlet at the required position by
rotating the rear part of the silencer.
3)
Re-tighten the assembly screw, followed by the
locknut.
It is recommended to seal the fitting faces of engine
exhaust and silencer with silicone sealant.
NOTE :
The standard expansion-chamber type silencer is
quite effective, but reduces power to some degree.
E-3010 Silencer
Exhaust pressure nipple
Reminder!
11
Assembly screw
Cone baffle
Turn to requlred position
Exhaust outlet
Locknut
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. Keep your hands and face away from
exhaust gas or you will suffer a burn.
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