O.S. Engines 21XM User Manual
It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-3 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 INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
FITTING THE GLOWPLUG, INSTALLATION OF THE CARBURETTOR
BASIC ENGINE PARTS
PIPING, INSTALLATION, LINKAGES
FUEL AND GLOWPLUG
FLEXIBLE DRIVE SHAFT, PROPELLER, BEFORE STARTING THE ENGINE
ADJUSTING THE CARBURETTOR, REALIGNMENT OF MIXTURE CONTROL VALVE
STARTING
RUNNING-IN (''Breaking-in'')
ADJUSTMENT,CARBURETTOR CLEANLINESS
CARE AND MAINTENANCE
TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START
EXPLODED VIEW
PARTS LIST
CARBURETTOR EXPLODED VIEW & PARTS LIST
THREE VIEW DRAWING AND SPECIFICATION
2~3
4
5
6
7
8
9
10
11
12~13
14
15
16
17
18
19
1
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR
O.S. ENGINE
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.
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.
NOTES
These cover the many other possibilities, generally less
obvious sources of danger, but which, under certain
circumstances, may also cause damage or injury.
WARNINGS
Never touch, or allow any object to come
•
into contact with, the rotating propeller.
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.
2
NOTES
●
This engine was designed for model boats.
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 most powerful highspeed engines) may eventually impair your hearing
and such noise is also likely to cause annoyance to
others over a wide area.
●
For their safety, keep all onlookers (especially
small children) well back (at least 12 feet or 4
metres) when preparing your model for running.
●
Take care that the glowplug clip or battery leads do
not come into contact with the propeller or any
other rotating parts. Also check the security of the
linkage to the throttle arm.
●
When starting your engine, use an electric
starter.The wearing of safety glasses is also
strongly recommended.
●
When handling the boat immediately prior to
launching, be especially cautious. Keep the
propeller and other rotating parts away from you.
●
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
supply.
●
Warning! lmmediately after a glowplug-ignition
Never try to stop the engine physically.
be stopped by cutting off the fuel
engine has been run and is still warm, conditions
sometimes exist whereby it is just possible for the
engine to fire if the glowplug battery is accidentally
reconnected.
3
The O.S. MAX-21XM is a high-performance
water-cooled outboard marine engine for small
and medium-size radio-controlled outboard
boats. It is of sturdy construction and designed
for easy maintenance. It is not necessary to
readjust the linkage when the installation angle
to the hull is changed.
A tilt mount is supplied as standard. Also, a
carbon-fibre propeller is included.
FITTING THE GLOWPLUG
Fit washer to glowplug and insert
carefully into cylinder-head, making
sure that it is not cross-threaded before
tightening firmly.
Glow plug
Washer
INSTALLATION OF THE CARBURETTOR
NOTE
This engine rotates clockwise. Do not force it to
•
turn counter-clockwise.
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.
We do not recommend running your boat on the
•
sea, or in any other saltwater environment.
Under such conditions, it is difficult to prevent
the engine from becoming corroded and,
eventually, inoperative.
As delivered, this engine has its carburettor lightly fitted into
its intake boss. Secure it as follows.
1.
Loosen the retainer screw and rotate the carburettor to its
proper position in the intake boss.
2.
The carburettor is aligned vertically and sealed against air
leaks by a heatproof rubber gasket between the
carburettor body and the rim of the intake boss. Therefore,
press the carburettor firmly down into the intake boss while
rotating the retainer screw.
Turn the screw gently until it stops, then tighten a further
90˚.
Note:
The two-piece retainer is designed to pinch the carburettor
from both sides. Do not overtighten.
4
BASIC ENGINE PARTS
Carburettor(OS TYPE 20J)
Needle-Valve
Water-Cooled Cylinder Head
E-2050 Silencer
Water Inlet Tube
Exhaust Outlets
Cooling Water Pickup
Flywheel(OS No.2J)
Mixture Control Screw
Crankcase
Throttle Lever
Throttle Linkage Bracket
Steering Arm
Transom Mounting Plate
Oil Transfer Tube
Cavitation Plate
Outboard Unit Lower Housing
Carbon-Reinforced Propeller
Skeg
5
PIPING
Connect the water inlet tube (L=170mm) and oil transfer pipe
(L=65mm) securely as shown on page 5. In the event of either
tube becoming damaged, it should be replaced with best
quality 5.5mm OD✕2.5mm ID silicone tubing.
Note : When cutting silicone tubing.....
Silicone tubing
Use knife or razor blade. Do not use wire cutters or pliers
If you should need to clean out silicone tubes, use methanol or glow-fuel, not gasoline.
INSTALLATION
The face of the mounting plate is precision machined flat.
Make sure that the hull's transom is also flat. The adjacent
hull structures should be as rigid as possible so that the
engine will be able to develop its full performance. Use 4mm
steel screws, such as Allen type socket head cap screws, with
locknuts or lockwashers for bolting the engine to the hull. For
extra security, apply LOCTITE to the screw threads to prevent
nuts vibrating loose.
LINKAGES
Steering Linkage
Use a high-torque servo, preferably with dual pushrods as
shown below.(A single pushrod will bend easily which results
in poor steering accuracy.)
Steering Servo
Steering Arm
Throttle Linkage
Use flexible 'Bowden' type cable having a 3mm OD outer
sleeve. Secure one end of the sleeve to the engine, by means
of the throttle linkage bracket supplied, and the other end to
any appropriate part of the hull structure immediately surrounding the throttle servo.(See sketch) If the two ends are
not secured in this way, steering the boat will upset throttle
control. Make sure that no strain is imposed on the throttle
cable when steering fully left or right. Adjust the throttle linkage so that the throttle can be fully closed to stop the engine
prior to lifting the boat from the water.(If necessary, consult
your R/C system handbook for setting up linkage in relation to
transmitter stick movement.)
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