O.S. engine MAX-12TR 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 vehicle, radio control equipment, etc.,
are accessible for checking at the same time.
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CONTENTS
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE
INTRODUCTION, BASIC ENGINE PARTS
INSTALLATION
AIR CLEANER TYPE 103
GLOWPLUG
TOOLS, ACCESSORIES, etc.
CARBURETTOR CONTROLS
PRESSURIZED FUEL SYSTEM
STARTING THE ENGINE &
RUNNING-IN('Breaking-in)
FINALADJUSTMENT
CARBURETTOR CLEANLINESS
CARE AND MAINTENANCE
O.S. GENUINE PARTS &
ACCESSORIES
ENGINES EXPLODED VIEW &
PARTS LIST
CARBURETTOR EXPLODED VIEW &
PARTS LIST
THREE VIEW DRAWING
MEMO
IF THE ENGINE FAILS TO START
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6
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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 applies basically to ALL MODEL ENGINES and 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
Model engine fuel is poi-
sonous. 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
whichmightigniteit.Donot
smokeorallowanyoneelse
to smoke, near to it.
Never operate your engine in an en-
closed space. Model engines, like
automobile engines, exhaust deadly
carbon-monoxide. 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.
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3
This engine is intended for model cars.
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.
Fit an effective silencer (muffler).
Frequent close exposure to a noisy
exhaust (especially in the case of the
more powerful highspeed engines)
may eventually impair your hearing
and such noise is also likely to cause
annoyance to others over a wide area.
The wearing of safety glasses is also
strongly recommended.
Take care that the glowplug clip or
battery leads do not come into contact
with rotating parts. Also check that the
linkage to the throttle arm is secure.
For their safety, keep all onlookers
(especially small children) well back
(at least 20 feet or 6 meters) when
preparing your model for running.
NOTES
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4
NOTES
To stop the engine, fully retard the
throttle stick and trim lever on the
trans-mitter, or, in an emergency, cut
off the fuel supply by pinching the fuel
delivery line from the tank.
•
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 it is rotated over
compression WITHOUT the glowplug
battery being reconnected.
•
5
INSTALLING THE GLOWPLUG
Carburettor
Install washer on glowplug
and insert carefully into
cylinder-head, making sure
that it is not cross-threaded
before tightening firmly.
BASIC ENGINE PARTS
The MAX-12TR is high-perfomance
engines for 1/10 class R/C racing cars.
There are two verions, the one with 10M
carburettor and the other with 10J
carburettor. The MAX-12TR has a
conventional crankshaft, while the MAX-
12TR(P) employs a special crankshaft
with integral pilot shaft.
Crankshaft
Glow plug
Washer
Drive Hub
Crankcase
Beam Mount
Heatsink Head
Cover Plate
As delivered, the engine has its carburetor
lightly fit into its intake. Secure it changing
its angle according to the car chassis.
NOTE
NOTE: With this engine, 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
normal running temperatures.
Standard accessories
Glow Plug A5 Super Air Cleaner 103 Assembly
103 Cleaner Body
103 Filter Elements (2pcs.)
Exhaust seal ring
Instruction manual
MAX-12TR
Exhaust
6
ENGINE INSTALLATION
Make sure that the vehicle's engine mounting
surfaces are level and in the same plane. Poor
installation may cause distortion of the
crankcase, bearings, etc., resulting in erratic
running and loss of performance.
The recommended screws for securing the
engine are 3mm or 4-40 steel Allen hexagon
socket type.
If existing holes in the engine mount do not align
perfectly with engine mounting lugs, enlarge
them slightly with a needle-file so that screws
enter vertically.
Chassis
Chamfer inside edges of bearers.
INSTALLATION OF THE CARBURETTOR
As delivered, the engine has its carburettor
lightly fit into the intake boss. Secure it as
follows.
Loosen the retainer screw, rotate the
carburettor to its correct position and make
sure that it is pressed well down into the
intake boss, compressing the rubber gasket,
before retightening screw.
Rotate the retainer screw gently until it
stops, then tighten a further 60-90˚.
Do not overtighten the screw as this will
damage the carburettor body.
1.
2.
Rotate the retainer nut
gently until it stops. Tighten a further 60-90˚
Fit the exhaust seal ring supplied.
7
AIR CLEANER TYPE 103
INSTALLATION OF AIR CLEANER
Carefully clean the carburettor, removing any old
adhesive or sealant that may have been
previously used on the outside of the air intake.
•
Press the air cleaner body
firmly over the carburettor air
intake. Make sure that the
outer rim of the air intake
engages the internal annular
groove in the air cleaner: failure to do so may
result in the air cleaner falling off.
•
It has a single filter element and is intended
primarily for circuit racing. The lower height
of the Super Air-Cleaner 103 also facilitates
easier installation in cars where available
space may be restricted.
Position the air cleaner correctly, so that it does
not foul the cylinder-head or obstruct the needle-
valve.
INSTALLING THE FILTER ELEMENT
The element is already
impregnated with a
special filter oil.As this oil
is very sticky, take care,
when handling it, to
prevent dust or dirt from
adheringtotheelement.If
your fingers become
contaminated, wash them
with soap and water.
Duringstorage,theoilmayhavebecomeunevenly
dispersed through the element. This will be
indicated if the blue colour of the element material
appears patchy. In this case, place the element in
asmallplasticbagandgentlyrubitbetweenfinger
and thumb to redistribute the oil.
It is advisable to replace the filter element with a
new one after not more than one hour of running
time. Always remove contaminated elements
carefully, to ensure that dirt cannot enter the
carburettor.
REPLACEMENT OF ELEMENT
Insert beneath flange
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8
GLOWPLUG
Since the compatibility of glowplug and fuel may have
a marked effect on performance and reliability, it may
be worthwhile to choose the R/C type plug found
most suitable after tests.Recommended O.S. plugs
are A5, No.8 and R5. Carefully fit plug finger-tight,
before final tightening with the correct size plug
wrench.
Glowplug life
Particularly in the case of very high performance
engines,
glowplugs must be regarded as expendable
items.
Install a plug suitable for the engine.
Use fuel containing a moderate percentage of
nitromethane unless more is essential for racing
events.
Do not run the engine too lean and do not leave the
battery connected while adjusting the needle.
However, plug life can be extended and engine
performance maintained by careful use, i.e.:
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The role of the glowplug
With a glowplug engine, ignition is initiated by the
application of a 1.5-volt power source. When the
battery is disconnected, the heat retained within the
combustion chamber remains sufficient to keep the
plug filament glowing, thereby continuing to keep the
engine running. Ignition timing is 'automatic' : under
reduced load, allowing higher rpm, the plug becomes
hotter and, appropriately, fires the fuel/air charge
earlier; conversely, at reduced rpm, the plug become
cooler and ignition is retarded.
Apart from when actually burned out, a plug may
need to be replaced because it no longer delivers its
best performance, such as when:
When to replace the glowplug
Filament surface has roughened and turned white.
Filament coil has become distorted.
Foreign matter has adhered to filament or plug
body has corroded.
Engine tends to cut out when idling.
Starting qualities deteriorate.
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9
Table of contents
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