O.S. Engines 12TZP User Manual
It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-5 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.
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE
ENGINE CONSTRUCTION, NOTES WHEN
APPLYING AN ELECTRIC STARTER
ABOUT THE ENGINE
TOOLS, ACCESSORIES, etc.
BASIC ENGINE PARTS
INSTALLATION OF THE STANDARD
ACCESSORIES, CARBURETOR
CONTROLS 11H, 11H(B)
GLOWPLUG, INSTALLATION
CONTENTS
2-5
6-7
9-11
12-13
14-15
STARTING THE ENGINE & RUNNING-IN
('Breaking-in)
FINAL ADJUSTMENT
8
CARE AND MAINTENANCE,
CHECKING THE ENGINE
TROUBLE SHOOTING
ENGINES, CARBURETORS EXPLODED
VIEWS &PARTS LIST
O.S. GENUINE PARTS & ACCESSORIES
THREE VIEW DRAWING
1
16-19
20-23
24-25
26-29
30-37
38-39
40
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 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
!
These cover events which
might involve serious (in
extreme circumstances, even
fatal) injury.
!
•
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 an 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.
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 operate your engine in an enclosed 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.
!
NOTES
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.
Install 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.
NOTES
•
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.
4
!
Before starting the engine, always check
the tightness of all the screws and nuts
especially those of joint and movable
parts such as throttle arm. Missing
retightening the loose screws and nuts
often causes the parts breakage that is
capable of harming you.
•
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.
NOTES
•
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 it is rotated over
compression WITHOUT the glowplug
battery being reconnected.
5
ENGINE CONSTRUCTION
With this engine, the piston will
feel tight at the top of its stroke
(TDC) when the engine is cold.
This is normal. The cylinder bore
has a slight taper. The piston
and cylinder are designed to
achieve a perfect running
clearance when they reach
operating temperature.
Near TDC
Piston
Cylinder Liner
Crankshaft
Slight taper
NOTES WHEN APPL YING
AN ELECTRIC STARTER
Do not over-prime. This could
cause a hydraulic lock and damage
the engine on application of the
electric starter.
If over-primed, remove glowplug,
close needle-valve and apply
starter to pump out surplus fuel.
Cover the head with a rag to
prevent pumped out fuel getting
into your eyes.
When the engine is cold.
6
When the engine is hot.
7
MAX-
12TZ SERIES INSTRUCTIONS
This manual handles the following two versions.
MAX-12TZ(P)-T3 (3 port version)
with 11H carburetor
MAX-12TZ(P)-T5 (5 port version)
with 11H(B) carburetor
Standard accessories
Glow Plug P6 T-type head
(Turbo head) 1piece
Exhaust Seal Ring 1piece
(Hot Type)
ABOUT THE ENGINE
These engines are rear exhaust
engines designed expressly for 1/10
class R/C touring cars and stadium
trucks. T-Type P6 plus is supplied with
the engine. Also, dual adjustable
carburetor is supplied.
The engines develop enormous torque
from the low r.p.m. and offer improved
fuel consumption and durability.
Big diameter heatsink head has
improved cooling efficiency.
8
TOOLS, ACCESSORIES, etc.
The following items are necessary for operating the engine.
Items necessary for starting
FUEL
Generally, it is suggested that the user selects a fuel
that is commercially available for model two-stroke
engines and contains 10-30% nitromethane. As a
starting point, we recommend a fuel containing 20%
nitromethane, changing to a fuel containing more
nitro if necessary. When the brand of fuel is changed,
or the nitro content increased, it is advisable to
repeat the running-in procedure referred to in the
RUNNING-IN paragraphs. Please note that with
high-nitro fuels, although power may
be increased for competition purposes,
glowplug elements do not last as long
and engine life will be shortened.
REMINDER!
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.
For
MAX-
12TZ(P)-T5 only
Carburetor Reducer 6.5mm (Gray) 1piece
(w/ "O" Ring)
NOTE
As delivered, the engine has the
carburetor lightly fit into its intake.
Secure it changing its angle and
outer head position according to
the car chassis.
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.
FUEL FILTER
To be installed in the fuel line
between fuel tank and carburetor
to prevent dust from entering the
carburetor.
GLOWPLUG IGNITER
Commercialy available handy
glowplug heater in which the
glowplug battery and battery
leads are integrated.
STARTER BOX
For starting the engine.
9
7.2V BATTERIES FOR STARTER BOX
Batteries for starter box.
Select according to the
starter box used. Be sure to
full charge before using.
FUEL PUMP
For filling the fuel tank, a simple,
polyethylene "squeeze" bottle,
with a suitable spout, is required.
SILICONE FUEL LINE
Heatproof silicone tubing of
approx. 5mm o.d. and 2mm i.d.
is required for the connection
between the fuel tank and
engine.
TOOLS
HEX SCREWDRIVER
Necessary for engine installation.
1.5mm, 2mm, 2.5mm, 3mm
SCREWDRIVER
Necessary for carburetor adjustments.
No.1, No.2, etc
SOCKET DRIVER
It is required to tighten and loosen the
carburetor retainer nut. Opposite side distance
of 6mm
LONG SOCKET WRENCH WITH PLUG GRIP
Recommended for easy removal and
replacement of the angled and recessed
glowplug, the O.S.Long Socket Wrench
incorporates a special grip.
10
BASIC ENGINE PARTS
Outer Head
Carburetor
Type 11H
Crankshaft
Cover Plate
Mounting Lugs
Crankcase
Crankshaft Ball Bearing (Front)
11
Exhaust
MAX-
12TZ(P)-T3
INSTALLATION OF THE
STANDARD ACCESSORIES
Installing the glow plug.
Insert P6 plug supplied
into heatsink-head carefully, making sure that it is
not cross-threaded before
tightening firmly.
(All the O.S. T-Type plugs
including the P6 are not
supplied with a washer.)
Install the exhaust seal
ring supplied.
Glowplug
Exhaust
Seal Ring
Installing the carburetor reducer
5.5mm (Black) bore reducer is installed on
both the 12TZ(P)-T3 and 12TZ(P)-T5
carburetor.
Extra 6.5mm bore reducer is supplied with
the 12TZ(P)-T5 only. With this reducer
installed, more power can be obtained, while
engine adjustment becomes a little critical
About the Head Gasket
These engines are equipped with two head
gaskets of 0.1mm thick and 0.2mm thick. It is
suggested to adjust the total thickness
according to atmospheric temperature,
humidity and glowplug used.
At early stage of running-in, when a glowplug
tends to burn out early or when high
nitromethane content fuel is used, try to run
the engine with both gaskets or removing the
0.1mm gasket.
When low nitromethane content fuel is used,
try to run the engine removing the 0. 2mm
gasket.
12
CARBURETOR CONTROLS 11H,
Carburetor Reducer
Needle Valve
Mixture Control Valve
Throttle Stop
Screw
Thermo Insulator
Ball Link No.5
Metering Needle
Dust Cover
11H(B
13
)
Four adjustable controls are provided on
this carburetor.
The Needle-Valve(Adjusted at the factory):
For adjusting the mixture strength when the
throttle is fully open.
The Mixture Control Valve:
For changing the mixture strength at mid
speed and acceleration. (Do not rotate the
screw more chan one turn.)
The Metering Needle:
For adjusting the mixture strength at partthrottle and idle speed, to obtain steady
idling and smooth acceleration to mid speed.
The Throttle Stop Screw
(Adjusted at the factory):
For setting the minimum idle speed:
NOTE: Readjustment may be necessary,
occasionally to allow for changes in fuel
formula, gear ratio or clutch engagement
point.
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