O.S. Engines 32SX-MX 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
NOTES CONCERING

THE RECOIL STARTER
GLOWPLUG
TOOLS, ACCESSORIES, etc.
CARBURETTOR CONTROLS

STARTING & INITIAL
RUNNING-IN('Breaking-in)

12

9

2~5

7

~
~

8

~

10
11

~

13

IF THE ENGINE FAILS TO START
ADJUSTMENT

6

CARE AND MAINTENANCE

7

O.S. GENUINE PARTS &
ACCESSORIES

8

THREE VIEW DRAWING

9

ENGINE EXPLODED VIEW
ENGINE PARTS LIST

CARBURETTOR EXPLODED VIEW &
PARTS LIST

1

13
15

13

~

15

~

16

16
17
18
19

20

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

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.

Model engine fuel is poison-

•

ous. 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 which might ignite it. Do
not smoke or allow anyone else
to smoke, near to it.

WARNINGS

Never operate your engine in an en-

•

closed space. Model engines, like auto­mobile engines, exhaust deadly carbon­monoxide. 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

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
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 20 feet or 6 meters) 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 that the linkage to the throttle arm is
secure.

If your engine does not have a built-in recoil

•

starter, 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.

4

NOTES

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! 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.

If your engine is fitted with a recoil starter,

•

pull the operating handle straight out when
starting the engine, so that the cord does
not rub against the hull or engine.
This will help prevent the cord from being
damaged by abrasion or engine heat.

Do not extend the starter cord more than

•

45cm (18"). Do not abruptly release the
operating handle.
Allow the cord to rewind smoothly while still
holding the handle.

Do not attempt to disassemble the recoil

•

starter (if fitted). If you do so, the very
strong spring inside will be suddenly
ejected. This can be very dangerous.

5

The O.S. MAX-32SX-MX is a high-perfor­mance water-cooled marine engine for small
radio-controlled boats, especially scale and
sport type hulls. The MAX-32SX-MX incor­porates a recoil starter system which pro­vides easy, positive starting, while eliminat­ing the need for an electric starter and star­ter-battery.

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. 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.

BASIC ENGINE PARTS

Carburettor Type 20C

Flywheel
Assembly

Flywheel No.2D

Beam Mount

Crankcase

INSTALLING THE GLOWPLUG

Install the washer on the
glowplug and insert carefully
into cylinder-head, making
sure that it is not cross­threaded before tightening
firmly.

6

Water Cooled Head

Starter Handle

Recoil Starter
Assembly No.4

Glow plug

Washer