O.S. engine MAX-21XM Guía de configuración

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

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.

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.

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

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.

•

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

appropriatescrewsand locknuts.

Fit an effective silencer(muffler).

Frequent close exposure to a noisy exhaust

(especially in the case of the most powerful high-

speed 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

be stopped by cutting off the fuel

supply.

Never try to stop the engine physically.

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 fire if the glowplug battery is accidentally

reconnected.

●

FITTING THE GLOWPLUG

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.

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.

Fit washer to glowplug and insert

carefully into cylinder-head, making

sure that it is not cross-threaded before

tightening firmly.

INSTALLATION OF THE CARBURETTOR

As delivered, this engine has its carburettor lightly fitted into

its intake boss. Secure it as follows.

Loosen the retainer screw and rotate the carburettor to its

proper position in the intake boss.

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

Note:

The two-piece retainer is designed to pinch the carburettor

from both sides. Do not overtighten.

Washer

Glow plug

•

BASIC ENGINE PARTS

Carburettor(OS TYPE 20J)

Needle-Valve

Water-Cooled Cylinder Head

E-2050 Silencer

Water Inlet Tube

Exhaust Outlets

Cooling Water Pickup

Carbon-Reinforced Propeller Skeg

Outboard Unit Lower Housing

Cavitation Plate

Oil Transfer Tube

Transom Mounting Plate

Steering Arm

Throttle Linkage Bracket

Crankcase

Throttle Lever

Mixture Control Screw

Flywheel(OS No.2J)

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.

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.)

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 sur-

rounding 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 link-

age 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.)

Note :When cutting silicone tubing.....

If you should need to clean out silicone tubes, use methanol or glow-fuel, not gasoline.

Silicone tubing

Use knife or razor blade. Do not use wire cutters or pliers

Steering Arm

Steering Servo

FUEL

Use only top quality commercial model two-stroke engine fuel.

For consistent performance and long engine life, it is essential

to use fuel containing AT LEAST 18%(volumetric ratio)best-

quality lubricant. This engine is designed to run on both low

and high nitromethane content fuels, i.e. from mild mixtures

containing a few percent of nitromethane, up to high-speed racing

fuels containing 30%, or more, of nitromethane. Generally, power

output is increased

up to a certain point

as the nitromethane

content of the fuel is increased.As a starting point, we recommend

a fuel containing 10% nitromethane, changing to a fuel

containing more nitro if necessary. When the nitro content of the

fuel is increased or the brand of fuel is changed, it is advisable to

run the engine with a richer needle-valve setting, initially, so

that the optimum setting for the new fuel may be rechecked as

described in the RUNNING-IN paragraph.

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 naked 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.

Reminder!

The O.S. No.8 glowplug is recommended and one is supplied

with this engine. The MAX-21XM may not always run so well

with other types of plug.

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 becomes cooler and

ignition is retarded.

Glowplug life

Particularly in the case of very high performance engines,

glowplugs must be regarded as expendable items. However,

plug life can be extended and engine performance maintained

by careful use, i.e.:

GLOWPLUG

Secure 3mm OD Outer Pipe

Throttle Servo

Linkage Bracket

PROPELLER

The MAX-21XM's special carbon-fibre propeller has a

diameter of 42mm and a P/D ratio of 1.2. If any other propeller

is substituted, make sure that it is properly balanced.

FLEXIBLE DRIVE SHAFT

If, due to accidental damage or wear, the flexible drive shaft

(see p.16) should require replacement, proceed as follows.

(Note: a wise precaution is to have a spare flexible shaft on

hand for such emergencies.) BEFORE STARTING THE ENGINE

When to replace the glowplug -

Apart from when actually burned out, a plug may need to be

replaced because it no longer delivers its best performance,

such as when:

Never touch, or allow any object to come into contact

with, the rotating propeller and do not crouch over the

engine when it is running.

●

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 when idling.

Starting qualities deteriorate.

With aid of the correct sized screwdrivers and hexagon

keys, separate the complete lower end (outboard unit

assembly) from the power-head and remove all parts

necessary to give access to the flexible drive shaft. This

has squared ends that fit into the PTO shaft at the power-

head and the propeller shaft at the bottom end. Note that

the propeller shaft bearing has a left-hand thread.

Fit a plug suitable for the engine (e.g. OS No.8).

Use fuel containing a moderate percentage of nitromethane

unless essential for racing events.

Do not run the engine too lean and do not leave the battery

connected while adjusting the needle.

●

The rapid changes of hull attitude that occur when a fast

boat is operating in choppy water, especially when the fuel

tank is located at some distance from the carburettor,

means that fuel ''head''at the carburettor jet can vary quite

considerably, causing the engine to run erratically or stop.

Therefore, it is advisable to use a moderately pressurized

fuel system.

Remove the flexible drive shaft and its sleeve and if any deb-

ris is found in the sleeve, wash it out with fuel or alcohol be-

fore greasing the full length of the new shaft and reinserting

it into the sleeve.

Make sure that the ends of the new shaft fit properly into the

PTO shaft and propeller shaft and that the new flexible shaft

rotates smoothly.

Then replace the curved side plate, cavitation plate,etc. and

re-unite the power-head with the lower assembly. Gently turn

the flywheel to check that the propeller rotates smoothly be-

fore tightening assembly screws.

Before starting the engine for the first run of the day,

remove the glowplug and check the engine by rotating the

flywheel by hand. It should rotate smoothly. Now turn the

engine with an electric starter until fuel is drawn into the

carburettor. At first, rotation may feel 'sticky' due to oily

residue remaining within the engine. The engine should

rotate freely after fresh mixture has been drawn into the

working parts.

Check the glowplug. If the plug element is distorted, off-

center, or has a white appearance, engine performance

may be below par.

Replace the plug if necessary.

When re-starting the engine, turn the flywheel by hand, as

before (but without removing the glowplug) to make sure

that there is nothing unusual, before energizing the glowplug

and applying the starter.

●

Never attempt to turn the engine with the starter if the engine

is over-primed with fuel or flooded with corrosion-inhibiting oil.

To do so is likely to seriously damage the working parts.

WARNING!

ADJUSTING THE CARBURETTOR

Two adjustable controls are provided on this carburettor.

REALIGNMENT OF MIXTURE CONTROL VALVE

In the course of making carburettor adjustments, it is just

possible that the Mixture Control Valve may be inadvertently

screwed in or out too far and thereby moved beyond its

effective adjustment range. (Refer to sketch, p.10, top left.)

Its basic setting can be reestablished as follows:

The basic (factory) setting is as shown in the main sketch, i.e.

with the shoulder portion 'A' exactly at a tangent to the throttle

rotor hole.

To return the Mixture Control Valve to its original position, first

screw in the Mixture Control Valve, while looking into the rotor

hole. Then gradually unscrew the Mixture Control Valve until

'A' is precisely tangential to the rotor hole (i.e. so that 'A' and

'B' are superimposed) as in the main sketch.

The Needle-Valve:

For adjusting the mixture strength when the throttle is fully

open.

The Mixture Control Screw:

For adjusting the mixture strength at idling speeds, to ob-

tain steady idling and smooth acceleration to mid speeds.

●

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