O.S. engine MAX-32SX-H Series Setup guide

It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-5 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 model, radio control equipment, etc.,
are accessible for checking at the same time.
•
•

CONTENTS
SAFETY INSTRUCTIONSAND WARNINGS
ABOUT YOUR O.S. ENGINE
INTRODUCTION
BASIC ENGINE PARTS,
INSTALLATION
NOTES CONCERNING
THE RECOIL STARTER
BEFORE STARTING
FACTS ABOUT GLOW PLUGS
FUEL
CARBURETOR CONTROLS
STARTING
RUNNING-IN,ADJUSTMENT
SUBSEQUENT READJUSTMENTS
CARBURETOR CLEANLINESS
ADJUSTING CHART
INSTALLATION OF THROTTLE SERVO
CARE AND MAINTENANCE
ENGINE EXPLODED VIEW &
PARTS LIST
CARBURETOR EXPLODED
VIEW & PARTS LIST
THREE VIEW DRAWING
O.S. GENUINE PARTS & ACCESSORIES
2 ~ 5
6
7
~ 8
8
8 ~ 10
10
~ 11
12
13
17
18
20
21
22
~ 25
26
27
~ 28
14
~ 17
19
29
1

Remember that your engine is not a "toy", but a highly efficient internal-
combustion 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.
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
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 NOTES
These cover events which
might involve serious (in
extreme circumstances, even
fatal) injury.
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 parts.
Model engine fuel is poison-
ous. 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,oranythingelsewhich
might ignite it. Do not smoke
orallowanyoneelsetosmoke,
near to it.
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.
Never operate your engine in an en-
closed space. Model engines, like auto-
mobile engines, exhaust deadly carbon-
monoxide. Run your engine only in an
open area.
3

NOTES
•
•
•
•
•
These engine were designed for model
helicopters. Do not attempt to use it for any
other purpose.
Mount the engine in your model securely, fol-
lowing the manufacturers' recommendations,
using appropriate screws and locknuts.
Install an effective silencer (muffler). Frequent
close exposure to a noisy exhaust (especially
in the case of the more powerful high-speed
engines) may eventually impair your hearing
and such noise is also likely to cause
annoyance to others over a wide area.
Check the linkage to the throttle arm before
each flight.
Avoid sudden high r.p.m. immediately after the
engine is started, as the clutch will engage and
you may be struck by the rotor.
•
•
After starting the engine, carry out any needle-
valve readjustments after stopping the rotor by
closing the throttle to the lowest r.p.m..
Stop the engine before attempting to make
other adjustments to the carburettor.
Use an electric starter. The wearing of safety
glasses is also strongly recommended.
Press the rotor head down securely.
Take care that the glow plug clip or battery
leads do not come into contact with rotating
parts.
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.
•
•
4

NOTES
•
•
•
•
•
•
Take care that loose clothing (ties, shirt sleeves,
scarves etc.) do not come into contact with the
rotor. Do not carry loose objects (such as pen-
cils, screwdrivers, etc.) in a shirt pocket from
where they could fall through the rotor disc.
For their safety, keep all onlookers (especially
small children) well back (at least 20 feet or 6
metres) 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.
Hold the rotor securely and keep well clear of
spectators.
Warning! lmmediately after a glowplug-ignition
engine has been run and is still warm,
conditions sometimes exist whereby it is just
possible for the engine to restart when turned
over WITHOUT the glowplug battery being
reconnected. Remember this if you wish to
avoid the risk of accidents.
Do not attempt to disassemble the recoil
starter (if fitted). If you do so, the very strong
spring inside will be suddenly ejected. This can
be very dangerous.
Do not extend the starter cord more than 45cm
(18"). Do not abruptly release the operating
handle. Allow the cord to rewind smoothly
while still holding the handle.
Pull the operating handle straight out when
stating the engine, so that the cord does not
rub against the helicopter structure or engine.
This will help prevent the cord from being
damaged by abrasion or engine heat.
5

Because of this initial tightness, a standard
electric starter may have difficulty in rotating
the engine when cold, before it has been
adequately run-in. In this case, use a high-
torque type starter. DO NOT,however, confuse
tightness with the symptoms of hydraulic lock
caused by an excess of fuel within the cylinder
- often the result of over-priming.
Attempting to force the engine to turn over in
this condition may cause internal damage.
Instead, remove the glowplug,invert the
engine and eject surplus fuel from the
combustion-chamber.
Note:
These engines are produced by the world's
oldest and largest model engine
manufacturing company ; a company that
has designed and manufactured all types of
engines, large and small : two-stroke, four-
stroke, Wankel-rotary, supercharged, twin
nand multi-cylinder four-strokes and has
also produced more helicopter units than
any other maker worldwide.
Highperformance motors, designed for
small-sized radio-controlled helicopters,
the MAX-32SX-H Series is available in a
choice of three versions. The standard
32SX-H features ABC cylinder/piston
construction, whereas the 32SX-H Ring
employs a compression-ring equipped
piston, while the 32SX-HX Ring has the
addition of an O.S. Recoil Starting System
to eliminate the need for a separate electric
starter and battery.
INTRODUCTION The close-fitting ringless piston of the
standard 32SX-H 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 normal
running temperature.
6

BASIC ENGINE PARTS
Heatsink Head
Carburetor
Typr 20C
Crankshaft
Propeller nut
Crankcase
Needle valve
Glowplug
Beam Mount
Recoil Starter
Assembly No.O
MAX-32SX-HX
Starter Handle
INSTALLING THE GLOWPLUG
Install washer on glowplug
and insert carefully into
cylinder-head, making sure
that it is not cross-threaded
before tightening firmly. Glow plug
Washer
INSTALLATION
The under-surfaces of all O.S. engine beam
mounting lugs are precision machined flat and
exactyly parallel to the engine's horizontal axis. It is
essential that the engine mounts in the model are
also accurately made and aligned. If they are not,
they will cause stress and distortion within the engine
itself, probably resulting in loss of performance and
internal damage.
The recommended screws for securing the engine to
the engine mounts in the model are 3mm or 4-40
steel Allen type. It is also advisable to use lock
washers or LOCTITE to prevent nuts from loosening.
7

As the recoil starter is of unit construction, re-
placement parts are not available. Replace-
ment recoil starters are obtainable only as
complete units.
Do not pull the starter cord more than 50cm (20
in.). Do not abruptly release the starter knob.
Allow the cord to rewind slowly by holding on
to the knob.
Pull the knob straight so that the cord does not
touch the helicopter body, etc.
Warning!
Note:
1.
3.
Do not attempt to disassemble the recoil starter:
the very strong spring inside will spring out,
which is very dangerous.
2.
Front view
CORRECT
Side view
Top surfaces are in the same plane.
Re-align the surfaces as necessary
INCORRECT
Top surfaces are not
in the same plane. Top surfaces are not in the
same plane.
Engine does not rest firmly.
BEFORE STARTING
Tools, accessories, etc.
The following items are necessary for operating the
engine.
1 Fuel
Model glowplug engine fuel of good quality, preferably
containing a small percentage of nitromethane.
2 Glowplug
O.S. A3 glowplug is installed in the engine.
NOTES CONCERNING THE RECOIL STARTER
( 32SX-HX ONLY)
8

3 Glowplug battery
The power source for heating the glowplug may be
either a large heavy-duty 1.5volt dry cell, or preferably,
a 2-volt rechargeable lead-acid cell.
1.5 volt heavy-duty
dry battery or 2 volt rechargeable lead-acid cell (at least 5Ah)
If a 2-volt cell is employed,
use a resistance wire, as
shown, to reduce applied
voltage, otherwise element
will overheat and burn out.
Resistance coil
(nichrome wire)
Adjust applied voltage by changing the position of clip on
resistance coil until glowplug element is glowing bright red.
Battery leads
Raise
voltage to
increase
brightness.
Lower voltage to
reduce brightness.
Warning (Very hot)
Never touch the nichrome wire while the battery is
connected.
4 Plug wrench
Used for tightening glowplug. The
O.S. long plug wrench is available
as an optional accessory.
5 Battery leads
These are used to conduct current
from the battery to the glowplug.
Basically, two leads, with clips, are
required, but, for greater conve-
nience, twin leads with special
glowplug connectors, as shown on
the right, are commercially
available.
6 Fuel bottle or pump
For filling the fuel tank, a simple,
polyethylene"squeeze"bottle,with
a suitable spout,is all that is
required. Alternatively, one of the
purpose-made manual or electric
fuelpumpsmaybeusedto transfer
fuel directly from your fuel
container to the fuel tank.
For tightening
glowplug
Fuel bulb
Battery leads
Manual
Electric
Fuel pumps
9