O.S. engine FS-52S Setup guide

It is of vital importance, before attempting to

operate your engine, to read the general

'SAFETY INSTRUCTIONS AND WARNINGS'

section on pages 2-6 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 aircraft, radio control equipment, etc.,

are accessible for checking at the same time.

●

SAFETY INSTRUCTIONSAND WARNINGS

ABOUT YOUR O.S. ENGINE

INTRODUCTION,BASIC ENGINE PARTS

INSTALLATION

EXHAUST HEADER PIPEAND SILENCER,

THROTTLE LINKAGE, NEEDLE-VALVE EXTENSION

PROPELLERS, FUEL

GLOWPLUG

FUELAND PRESSURE LINES,

PROPELLER AND SPINNER ATTACHMENT

TYPE 40N CARBURETTOR,

CONTROL LOCATIONS

STARTING

CONTENTS

RUNNING -IN

IDLING MIXTURE ADJUSTMENT

VALVE ADJUSTING

CARE AND MAINTENANCE

ENGINE EXPLODED VIEW

ENGINE PARTS LIST

CARBURETTOR EXPLODED

VIEW & PARTS LIST

GENUINE PARTS &ACCESSORIES

THREE VIEW DRAWING

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.

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 NOTES

These cover events which

might involve serious (in

extreme circumstances, even

fatal) injury.

These cover the many other

possibilities, generally less obvious

sources of danger, but which, under

certain circumstances, may also

cause damage or injury.

WARNINGS

Model engine fuel is poisonous. Do not

allow it to come into contact with the eyes

or mouth.Always store it in a

clearlymarkedcontainerand

out of the reach of children.

Never operate your engine in an en-

closed space. Model engines, like auto-

mobile 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.

•

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.

A weakened or loose propeller may

disintegrate or be thrown off and, since

propeller tip speeds with powerful

engines may exceed 600 feet(180 metres)

per second, it will be understood that

such a failure could result in serious

injury, (see 'NOTES' section relating to

propeller safety).

•

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

anyoneelsetosmoke,neartoit.

•

NOTES

•

This engine was designed for model

aircraft. Do not attempt to use it for any

other purpose.

Mount the engine in your model securely,

following the manufacturers' recommenda-

tions, using appropriate screws and lock-

nuts.

Be sure to use the silencer (muffler)

supplied with the engine. Frequent

exposure to an open exhaust may

eventually impair your hearing.

Such noise is also likely to cause

annoyance to others over a wide area.

Fit a top-quality propeller of the diameter

and pitch specified for the engine and

aircraft. Locate the propeller on the shaft so

that the curved face of the blades faces

forward-i.e. in the direction of flight. Firmly

tighten the propeller nut, using the correct

size wrench.

If you remove the glowplug from the engine

and check its condition by connecting the

battery leads to it, do not hold the plug with

bare fingers.Use an appropriate tool or a

folded piece of cloth.

NOTES

•

Always check the tightness of the propeller

nut and retighten it, if necessary, before

restarting the engine, particularly in the

case of four-stroke-cycle engines. If a

safety locknut assembly is provided with

your engine, always use it. This will prevent

the propeller from flying off in the event of a

"backfire", even if it loosens.

If you fit a spinner, make sure that it is a

precision made product and that the slots

for the propeller blades do not cut into the

blade roots and weaken them.

Preferably, use an electric starter. The

wearing of safety glasses is also strongly

recommended.

•

•Discard any propeller which has become

split, cracked, nicked or otherwise rendered

unsafe. Never attempt to repair such a

propeller: destroy it. Do not modify a propeller

inanyway,unlessyouarehighlyexperienced

in tuning propellers for specialized

competition work such as pylon-racing.

Take care that the glow plug clip or battery

leads do not come into contact with the

propeller. Also check the linkage to the

throttle arm. A disconnected linkage could

also foul the propeller.

After starting the engine, carry out any

needle-valve readjustments from a safe

position behind the rotating propeller. Stop

the engine before attempting to make other

adjustments to the carburettor.

•

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.

Take care that loose clothing (ties, shirt

sleeves, scarves, etc.)do not come into

contact with the propeller.Do not carry loose

objects (such as pencils, screwdrivers, etc.)

in a shirt pocket from where they could fall

through the propeller arc.

Do not start your engine in an area

containing loose gravel or sand.

The propeller may throw such material in

your face and eyes and cause injury.

For their safety, keep all onlookers

(especially small children) well back (at

least 20 feet or 6 meters) when preparing

your model for flight. If you have to carry

the model to the take-off point with the

engine running, be especially cautious.

Keep the propeller pointed away from you

and walk well clear of spectators.

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 the propeller is casually flipped

over compression WITHOUT the glowplug

battery being reconnected. Remember this

if you wish to avoid the risk of a painfully

rapped knuckle!

INSTALLING THE GLOWPLUG

Carburettor

Fit washer to glowplug and

insert carefully into cylinder-

head, making sure that it is

not cross-threaded

before tightening firmly.

BASIC ENGINE PARTS

Having pioneered the development of four-

stroke cycle model aircraft engines in 1976,

O.S. has maintained a continuing program of

technological advancement, examples of

which, would include the line of beautiful

multi-cylinder engines, with many new

engine designs continually under

development.Oneofthelatter is this new FS-

52S model. Closely resembling the FS-48S

externally, the FS-52S combines increased

performance and improved durability at

virtuallynoincreaseinoveralldimensionsor

weight.

Crankshaft

Glow plug

Washer

Drive Hub

Crankcase

Beam Mount

Silencer

Rocker Cover

INTRODUCTION

Push Rod Cover

Intake Pipe

INSTALLATION How to fasten the mounting screws.

Hardwood mounting beams

O.S. radial motor mount

(cast aluminum)

Tighten second nut firmly

down onto first nut.

Tighten this nut first.

Steel washer

3.5mm steel nuts

3.5mm steel screw

Spring washer or

lock washer

15mm min.

Hardwood such as

cherry or maple.

Spring washer

3.5mm steel Allen screw

Front view

CORRECT

Side view

Top surfaces are in the same plane.

Re-align the surfaces

as necessary

INCORRECT

Top surfaces are not

in the same plane. Opposite beam

Top surfaces

are not in the

same plane.

Engine does

not rest firmly.

Rigid hardwood

(e.g. maple)

At least

15mm(19/32")

At least

15mm(19/32")

Installation in the model

A typical method of beam

mounting is shown below,left. O.S. radial motor mount

(Available as an optional extra part.

See parts list)

Make sure that the mounting beams are parallel

and that their top surfaces are in the same plane.

NEEDLE-VALVE EXTENSION

The needle-valve supplied with this engine is

designed to accept an extension so that, when the

engine is enclosed in a cowling, the needle-valve may

be adjusted from the outside.

An L-shaped rod, of appropriate length, may be

inserted in the needle-valve knob center hole and

secured by tightening the set-screw with a 1.5mm

Allen key.

Before connecting the throttle to the servo, make sure

that the throttle arm and linkage safely clear any

adjacent part of the airframe structure, etc., as the

throttle is opened and closed.

Connect the linkage so that the throttle is fully closed

when the transmitter throttle stick and its trim lever

are at their lowest settings and fully open when the

throttle stick is in its fully-open position..

Carefully align the appropriate holes in the throttle

arm and servo horn so that they move symmetrically

and smoothly through their full travel.

Fit these in the following sequence.

Screw the header pipe into the cylinder head until it

bottoms, then unscrew sufficiently to achieve the

desired exhaust angle and tighten the locknut securely

with a 14mm wrench. Screw the silencer onto the outer

end of the header pipe and tighten the second locknut.

The application of a heatproof silicone sealant to the

threads of the exhaust system is recommended to

reduce the risk of joints loosening and the leakage of

exhaust gases and oil residue.

Reminder:

Model engines generate considerable heat and

contact with the header pipe or silencer may result in

a serious burn. If you need to tighten the silencer

joints, which may loosen when they are hot, use a

thick folded cloth for protection.

EXHAUST HEADER PIPE & SILENCER

THROTTLE LINKAGE

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