O.S. Engines 21RZ-RP 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.
CONTENTS
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE
INTRODUCTION, BASIC ENGINE PARTS
INSTALLATION
AIR CLEANER TYPE 202
GLOWPLUG
TOOLS, ACCESSORIES, etc.
CARBURETOR CONTROLS
STARTING THE ENGINE &
RUNNING-IN('Breaking-in)
IF THE ENGINE FAILS TO START
FINAL ADJUSTMENT
2~5
10
~
11
11
12~13
14
~
15
14
CARBURETOR CLEANLINESS
BEFORE STARTING THE ENGINE
6
CARE AND MAINTENANCE
7
GUARANTEE
THREE VIEW DRAWING
8
EXPLODED VIEW
9
ENGINE PARTS LIST
CARBURETOR EXPLODED VIEW &
PARTS LIST
O.S. GENUINE PARTS &
ACCESSORIES
MEMO
1
16
15
~
17
18
19
20
21
22
23
24
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.
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
•
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.
•
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.
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.
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
•
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 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.
NOTES
5
The MAX-21RZ-R(P) is high performance
3.5cc class power units for one-eighth-scale
radio-controlled 'Track racing' cars. It has been
designed to meet the exacting requirements of
the world's most expert drivers. An exhaustive
program of research, development and prototype testing has resulted in one of the most
powerful production model racing car engines
currently available.
Standard accessories
Glow Plug R5
Exhaust Seal Ring Silicone Tubing
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.
Super Air Cleaner 202
NOTE
As delivered, the engine has its carburetor lightly
fit into its intake. Secure it changing its angle
according to the car chassis.
BASIC ENGINE PARTS
Heatsink Head
Carburetor
Type 20A
Mounting Lugs
Crankshaft
Silicone Tubing
SILICONE TUBING AND O-RINGS
Before installing the engine on the chassis:
Connect the intake chamber and the carburetor with
1.
the silicone tubing supplied.
(Note: In the event of the silicone tubing requiring replacement, use tubing of 2.5mm i.d. 5.5mm
o.d. and 85mm in length.)
2.Fit the exhaust seal ring supplied.
6
Exhaust
Seal Ring
Crankcase
Intake
Chamber
INSTALLING THE GLOWPLUG
Fit washer to glowplug and
insert carefully into heatsink
head, making sure that it is
not cross-threaded
before tightening firmly.
Glow plug
Washer
INSTALLATION OF THE CARBURETOR
As delivered, the engine has its carburetor lightly
fit into its intake boss. Secure it as follows.
Loosen the retainer screw, rotate the
1.
carburetor 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
2.
screw gently until it
stops, then tighten
a further 90-120˚.
Do not overtighten
the screw as this
will damage the
carburetor body.
Rotate the
retainer nut
gently until
it stops.
Tighten a
further
90-120˚
7
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 are
in alignment with the mounting holes.
Chassis
Chamfer inside edges of bearers.
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