O.S. Engines FS-120S-E User Manual

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O.S. Engines FS-120S-E User Manual

It is of vital importance, before attempting to operate your engine, to read the general

'SAFETY INSTRUCTIONS AND WARNINGS' section on pages 2-4 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.

CONTENTS

SAFETY INSTRUCTIONS AND

2-4

STARTING

12-13

WARNINGS ABOUT YOUR O.S. ENGINE

INTRODUCTION, INSTALLING THE GLOWPLUG

 

RUNNING-IN

14-15

BASIC ENGINE PARTS

5

 

15

 

 

IDLE MIXTURE ADJUSTMENT

RELOCATION OF CARBURETTOR CONTROLS

 

 

 

CHOKE VALVE

6

VALVE ADJUSTING

16-17

FUEL TANK, INSTALLATION

7

CARE AND MAINTENANCE

18

EXHAUST HEADER PIPE AND SILENCER,

 

O.S. GENUINE PARTS & ACCESSORIES

19

THROTTLE LINKAGE,

 

 

 

NEEDLE-VALVE EXTENSION

8

ENGINE EXPLODED VIEWS &

 

 

 

ENGINE PARTS LISTS

20-21

PROPELLERS,

 

 

 

PROPELLER AND SPINNER ATTACHMENT

9-10

CARBURETTOR EXPLODED VIEWS &

 

 

 

PARTS LIST

22

FUEL

10

 

 

 

 

ENGINE THREE VIEW DRAWINGS

23

GLOWPLUGS

11

 

 

 

 

NOTE

24

CARBURETOR

12

 

 

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 or abused. 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.

2

WARNINGS

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 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 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.

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' recommendations, using appropriate screws and locknuts.

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.

Install 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.

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. A safety locknut assembly is provided. Always use it. This will prevent the propeller from flying off in the event of a "backfire", even if it loosens.

If you install 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.

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 in any way, unless you are highly experienced in tuning propellers for specialized competition work such as pylon-racing.

Use an electric starter for this engine. The wearing of safety glasses is also strongly recommended.

3

NOTES

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.

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!

4

INTRODUCTION

The O.S. FS-120S-E is an aircooled, overhead-valve four- stroke-cycle engine for model aircraft use. It is produced by the world' s pldest and largest model engine manufacturing company: a company which also pioneered the quantity production at model four-stroke-cycle engines.

Please note that this engine is not supplied with any tools (e.g. Allen keys, wrenches, etc.)

Standard Accessories

Exhaust Header Pipe Assembly

Glow Plug Type F

Silencer Assembly

 

INSTALLING THE GLOW PLUG

Carefully insert plug, with washer, fingertight only, before final tightening with the correct size plug wrench.

Glow plug

Washer

BASIC ENGINE PARTS

Rocker Cover

Cylinder Head

Carburettor

Push Rod Cover

Drive Hub

Cover Plate

Beam Mount

 

Propeller Washer

 

Lock Nut

Propeller Nut

Crankcase

 

 

5

RELOCATION OF CARBURETOR CONTROLS

The needle-valve and throttle lever locations are interchangeable by reversing the carburetor. This can be done as follows:

Remove the carburetor carefully by unscrewing the two screws which secure both carburetor and choke valve. (See Photo 1.)

If the carburetor remains difficult to remove, slightly loosen the two screws which secure the intake pipe to the cylinder head. After reversing the carburetor, re-fit it to the intake pipe gently, taking care not to damage the O-ring in the carburetor by using foce.

Screw

"O" Ring

Carburetor Retaining Screw

Set screw

Choke lever

Hexagon nut

Cap screw

Choke rubber pad

Photo 1

CHOKE VALVE

The FS-120S-E is equipped with a spring-loaded choke valve. The choke valve operating lever can be located right or left by transposing the hexagon nut and cap screw.

After mounting the engine in the model, secure the L-shaped choke rod by tightening the set-screw.

If the rod supplied is too long, reduce it to the required lebgth. If the rod length is more than 40mm (1 1/2 in.) its outer end should be supported to avoid vibration.

6

FUEL TANK

The suggested fuel tank size is 400cc or 14 oz. This will give approximately 10 minutes running time when some partthrottle operation is included. Locate the fuel tank so that the centre line of the tank is 10 to 15mm below the centre line of the needle-valve.

NOTE

If the model is left unattended with the fuel tank filled, fuel may flow into the carburetor, causing it to "flood" and making the engine difficult to start. Take appropriate action to prevent this.

Centre line

INSTALLATION

Because the FS-120S-E powerful, large-displacement, singlecylinder four-stroke-cycle engines, it is essential to use very substantial engine mounting. Conventional wooden mounting beams should be of rigid hardwood and of at least 15mm or 5/8-in square section.

Make sure that these mounting beams are accurately aligned and firmly integrated with the airframe, reinforcing the adjacent structure to absorb vibration. Use 5mm or larger steel screws, preferably Allen type hexagon socket head cap screws, with washers and locknuts, for bolting the engine to the bearers. As an alternative to wooden beam mounting, a special O.S. cast aluminium radial motor mount, complete with 5mm mounting screws, is available as an optional extra part (Code No.71904200) , where front bulkhead (firewall) type mounting is called for. Engine installation should, in any case, be made in such a way that basic maintenance can be conveniently carried out.

Make sure that the mounting beams are parallel and that their top surfaces are in the same plane.

CORRECT

INCORRECT

 

 

Front view

Side view

Top surfaces are not

Opposite beam

in the same plane.

 

Top surfaces are in the same plane.

Top surfaces are not

 

 

 

Re-align the surfaces in the same plane.

 

 

as necessary

Engine does not

 

 

 

rest firmly.

 

 

How to fasten the mounting screws.

 

 

 

 

 

 

 

Tighten second nut firmly

5mm steel Allen screw

5mm steel nuts

 

down onto first nut.

 

Tighten this nut first.

 

Spring washer or

 

Spring washer

 

 

lock washer

 

 

 

15mm min.

 

Hardwood such as

 

15mm min.

cherry or maple.

 

Steel washer

 

 

 

5mm steel screw

 

Hardwood mounting beams

O.S. radial motor mount

(cast aluminum)

 

 

 

 

7

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