O.S. Engines FS-56a User Manual

Page 1

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.

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Also, please study the entire contents of this instruction manual, so as to familiarize yourself with the controls and other features of the engine.

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Keep these instructions in a safe place so that you may readily refer to them whenever necessary.

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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 WARNINGS ABOUT YOUR O.S. ENGINE

NOTES WHEN APPLYING AN ELECTTRIC STARTER

ABOUT THE ENGINE

ENGINE PARTS NAME

BEFORE STARTING

INSTALLATION

INSTALLING SILENCER

FUEL TANK & LINES

PROPELLER

GLOWPLUG

2-6

10-13

14-16

17-18

MIXTURE CONTROLS

STARTING

RUNNING -IN ("Breaking-in")

IDLE MIXTURE ADJUSTMENT

CARE AND MAINTENANCE

ENGINE EXPLODED VIEW & PARTS LIST

CARBURETOR EXPLODED VIEWS & PARTS LIST

GENUINE PARTS & ACCESSORIES

THREE VIEW DRAWING

MEMO

22-23

24-26

27-28

29-30

31-33

34-35

36-37

Page 2

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 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.

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.

NOTES

These cover the many other possibilities, generally less obvious sources of danger, but which, under certain circumstances, may also cause damage or injury.

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.

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.

Page 3

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.

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.

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.

NOTES

Always check the tightness of the propeller nut and retighten it, if necessary, before restarting the engine. Also, check the tightness of all the screws and nuts before restarting the engine.

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.

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 in any way, unless you are highly experienced 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 carburetor.

Page 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.

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 glowplugignition 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!

NOTES WHEN APPLYING AN ELECTRIC STARTER

Do not over-prime. This could cause a hydraulic lock and damage the engine on application of the electric starter.

If over-primed, remove glowplug, close needle-valve and apply starter to pump out surplus fuel. Cover the head with a rag to prevent pumped out fuel from getting into your eyes.

Page 5

ABOUT THE ENGINE

This is the first model from the new FS series of the single cylinder overhead valve four cycle engines. It features a sharp and modern look and broad power band to suit a variety of model types. Newly designed F-4040 silencer minimizes noise with its soft, low-amplitude sound. Threaded header pipe allows adjustments in the distance between silencer and exhaust and exhaust angle. New lubricating system eliminates the need for breather tubing from the crankcase. It has the same mounting dimensions, drive hub position and linkage position with the FS-52S.

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

STANDARD ACCESSORIES

F-4040 Silencer Assembly

Silencer Body

Exhaust Header Pipe(W/M10 Lock Nut)

Glow Plug TYPE F

Intake Manifold

Carburetor Type 40NA

Rocker Cover

Cover Plate

ENGINE PARTS NAME

Exhaust Header Pipe Nut M10

Cylinder Head

Exhaust Header Pipe

Propeller Nut

Lock Nut

Propeller Washer

Drive Hub

Crankcase

Beam Mount

F-4040 Silencer Body

Page 6

BEFORE STARTING

Tools, accessories, etc. The following items are necessary for operating the engine.

Propellers

The choice of propeller depends on the design and weight of the aircraft and the type of flying in which you will be engaged. Determine the best size and type after practical experimentation. As a starting point, refer to the props listed in the accompanying table. Slightly larger, or even slightly smaller,

props than those shown in the table may be used, but remember that the propeller noise will increase, due to higher rpm or if a largerdiameter/lower-pitched prop is used.

Type

Sport & Aerobatic

Scale

Size(DxP)

13x6, 12x6-8

13x6-7, 12x6-8

Warning: Make sure that the propeller is well balanced. An unbalanced propeller and/or spinner can cause serious vibration which may weaken parts of the airframe or affect the safety of the radio-controlled system. DO NOT forget the WARNINGS and NOTES on propeller and spinner safety given on front pages.

Reminder!

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.

Spinner

Since the FS -56 is intended to be started with an electric starter, the addition of a spinner assembly for centering the starter sleeve is desirable. Use a heavy-duty, well balanced spinner either of metal or plastic.

We would suggest that you use such fuels only if you are satisfied that they do not adversely affect running qualities when compared with familiar standard fuels. When changing to a fuel brand or formula that is different from the one to which you are accustomed, it is a wise precaution to temporarily revert to in-flight running-in procedures, until you are sure that the engine is running entirely satisfactorily.

FUEL

The FS -56 should be operated on a methanol based fuel containing not less than 18% (volumetric) castor oil, or a top quality synthetic lubricant (or a mixture of both),

Reminder!

plus a small percentage (5-20%) of nitromethane for improved flexibility and power. (The carburetor is adjusted a little on the rich side at the factory for a fuel containing 20% lubricant and 15% nitromethane.) Some commercial fuels also contain coloring additives as an aid to fuel level visibility. In some cases, these additives have indicated slightly negative effects on the performance.

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 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.

Page 7

Fuel Tank

A fuel tank of approximately 220cc capacity is suggested. This allows around 12 minutes flying time, dependent upon the type of fuel used, the size of propeller and on the amount of full-throttle to part-throttle operation throughout the flight.

GLOW PLUG

O.S. Type F glowplug is installedin the engine.

GLOWPLUG IGNITER

Commercialy available handy glowplug heater in which the glowplug battery and battery leads are integrated.

FUEL PUMP

Alternatively, one of the purpose-made manual or

Manual

Electric

electric fuel pumps may be used to transfer fuel directly from your fuel container to the fuel tank.

Electric Starter and Starter Battery

Required when starting the engine.

12-Volt lead-acid battery

O.S. Super Filter (Fuel Can Filter)

Install a filter on the outlet tube of your refueling container to prevent entry of foreign matter into fuel tank. O.S. ‘Super Filters’ (large and small) are available as optional extras.

O.S. Non-Bubble Weight

To prevent the pickup from adhering to the tank wall under suction and restricting fuel flow, slots may be filed in the end of the weight. Alternatively, an O.S. NonBubble Weight is available as an optional extra.

Electric Starter

Fuel Filter

It is recommended to install a good in-line filter between the fuel tank and carburetor to prevent entry of foreign matter into the carburetor.

SILICONE FUEL LINE

Heatproof silicone tubing of approx. 5mm o.d. and 2.5mm i.d. is required for the connection between the fuel tank and engine.

TOOLS

LONG SOCKET WRENCH WITH PLUG GRIP

Recommended for easy removal and replacement of the angled and recessed glowplug, the O.S.Long Socket Wrench incorporates a special grip.

8mm

HEX Screwdriver

Necessary for engine installation.

1.5mm, 2.5mm

Phillips Screwdriver

No.2, etc.

SCREWDRIVER

Necessary for carburetor adjustments.

Socket Screwdriver

5mm, 5.5mm, 7mm

End Wrenches

Needle Nose Pliers

10mm, etc.

Page 8

INSTALLATION

It is suggested to use as heavy and rigid as possible engine mounting for highest performance and safe running. Conventional wooden mounting beams should be of rigid hardwood and of at least 15mm or 5/8-in square section. Use at least 3mm steel screws, such as Allen type, with locknuts, for bolting the engine to the bearers..

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

CORRECT

Rear view

Top surfaces are in the same plane.

Side view

How to fasten the mounting screws.

Hardwood mounting beams

3.5mm steel nuts

Spring washer or lock washer

15mm min.

Tighten second nut firmlydown onto first nut.

Tighten this nut first.

Hardwood such as cherry or maple.

Steel washer

3.5mm steel screw

Radial motor mount (cast aluminum)

3.5mm steel Allen screw

Spring washer

INCORRECT

Top surfaces are not in the same plane.

Re-align the surfaces as necessary

Opposite beam Top surfaces are not in the same plane.

Engine does not rest firmly.

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Make sure that these mounting beams are accurately aligned and firmly integrated with the airframe, reinforcing the adjacent structure to absorb vibration. Use 4mm or larger steel screws, preferably Allen type hexagon socket head cap screws, with washers and locknuts, for bolting the engine to the bearers.

O.S. Radial Motor Mount

A special O.S. radial motor mount (Code No.71913000) is available, as an optional extra, for use where firewall type mounting is required.

Page 9

THROTTLE LINKAGE

Before connecting the throttle to its 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.

NEEDLE-VALVE EXTENSION

The needle-valve supplied with this engine is designed to incorporate an extension so that, when the engine is enclosed within the fuselage, the needle-valve may be adjusted from the outside. Cut a commercially available rod to the required length, bend one end to an L shape, insert it into needle's center hole and secure it by tightening the set-screw in the needle-valve knob with 1.5mm Allen key. Needle Valve Extension Cable Set (Code No.

72200080) is available from O.S. as an optional part.

Screw the exhaust header pipe in the

cylinder head to the bottom and secure it with the nut. (A short screw in depth may damage the threads of the cylinder head due to vibration.)

Screw the silencer on the exhaust header pipe more than 8mm (10 turns) and secure it with the nut. (A short screw in depth may break the silencer or header pipe due to vibration.) The distance between silencer and cylinder head can be adjusted by approximately 10mm by screwing the silencer on or out the header pipe. Do not screw the silencer on the header pipe more than 10mm , or it hits the silencer assembly screw. Adjust the silencer position by rotating the silencer.

1.5mm Allen key.

Set Screw

Needle Valve Extension Cable Set

INSTALLING SILENCER

Apply silicone sealant to the threads to prevent the silencer and header pipe from loosening and leaking oil.

Exhaust Header Pipe Nut

Exhaust Header Pipe

Apply silicone sealant.

Page 10

The exhaust outlet of the silencer can be rotated to any desired position in the following manner:

Loosen the locknut and assembly screw.

Set the exhaust outlet at the required posi-

2) tion by rotating the rear part of the silencer.

Re-tighten the assembly screw, followed by the locknut.

Assembly screw

Exhaust pressure nipple

Reminder!

Make sure that the tank is well rinsed out with methanol or glow fuel before installation and that the pickup weight is well clear of the bottom of the tank when held vertically.

The suggested fuel tank size is 220cc. This will give approximately 12 minutes running time when some part-throttle operation is included.

Baffle

Turn to reguired position

Locknut

"O" Ring

Exhaust outlet

FUEL TANK & LINES

Locate the fuel tank so that the center line of the tank is 10 to 15mm below the center line of the needle-valve.

For plumbing, use heavy duty silicone tube of 2.5mm inner dia and 5mm outer dia.

Be sure to use a pressurized fuel system by connecting the muffler pressure nipple to the vent-pipe of the fuel tank.

Locate the fuel tank as close to the engine as possible to minimize fuel level head pressure variation.

needle-valve Center Line

Fuel Tank Center Line

Approx. 15mm

Approx.10-15mm

Page 11

There is a risk, particularly with powerful fourstroke engines, of the propeller flying off if the prop nut loosens due to detonation ("knocking") in the combustion chamber when the engine is operated too lean, or under an excessively heavy load.

Obviously, this can be very hazardous. To eliminate such dangers, the O.S. Safety Locknut Assembly was devised. Install this as follows:

Install the prop to the engine shaft, followed

by the retaining washer and prop nut and tighten firmly with a 12mm wrench. (not supplied).

Add the special tapered and slotted locknut

and secure with a 10mm wrench (not supplied) while holding the prop nut with the 12mm wrench.

PROPELLER

Propeller washer

Locknut

NOTE:

Make a habit of always checking the tightness of the propeller before starting the engine. Remember that, especially with wooden propellers, there is a tendency for the material to shrink, or for it to be reduced by the serrated face of the drive hub. Retighten the propeller nut if necessary after loosening the Safety Propeller Locknut. The locknut should be tightened firmly after retightening the propeller nut.

Propeller nut

Since the compatibility of the glowplug and fuel may have a marked effect on performance and reliability, it is suggested to use the O.S. Type F plug when it is necessary to replace. Carefully install plug finger-tight, before final tightening with the correct size plug wrench.

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 become cooler and ignition is retarded.

GLOWPLUG

Glowplug life

Particularly in the case of very high performance

glowplugs must be regarded as expendable

engines, items. However, plug life can be extended and engine performance maintained by careful use, i.e.:

Install a plug suitable for the engine.

Use fuel containing a moderate percentage of nitromethane unless more is essential for racing events.

Do not run the engine too lean and do not leave the battery connected while adjusting the needle.

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:

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 out when idling. Starting qualities deteriorate.

Page 12

RELOCATION OF CARBURETOR CONTROLS

The carburetor can be turned 180 to reverse the needle-valve and throttle lever position.

Remove the intake manifold retaining

screws and carburetor retaining screws.

Rotate the intake manifold 180 gently

without removing the carburetor from the intake manifold.

Re-install the intake manifold and carburetor

retaining screws. Make sure the fitting faces are clean. Do not over-tighten the screws.

MIXTURE CONTROLS

Intake Manifold

Retaining Screw

Carburetor Retaining Screw

TYPE 40NA CARBURETTOR

Two mixture controls are provided on this Carburetor.

The Needle Valve

When set to produce maximum power at full throttle, this establishes the basic fuel/air mixture strength. The correct mixture is then maintained by the carburetor's built-in automatic mixture control system to cover the engine's requirements at reduced throttle settings.

The Mixture Control Nozzle

This meters fuel flow at part-throttle and idle speeds to ensure reliable operation as the throttle is opened and closed. The Mixture Control Nozzle is factory set for the approximate best result. First run the engine as received and readjust the Mixture Control Nozzle only if necessary.

Rotor Guide Screw

Throttle Lever

Air Funnel

Fuel Inlet

Needle Valve

Mixture Control Nozzle

The sequence in which these controls are adjusted is explained in the succeeding sections, under Starting, Running-in and Idle Adjustment.

Page 13

STARTING

The FS -56 is not equipped with manual choke controls, as it is intended for use with an electric starter only. A high-torque electric starter not only makes starting the engine easier, it dispenses with the need for a choke valve by turning the engine over fast enough to the cylinder automatically. Starting procedure is as follows:

Fill the fuel tank with fuel. When filled,

prevent fuel flowing into the carburetor with a commercially available fuel stopper, etc. Release the stopper before starting the engine.

Make sure that the plug element glows red,

2. and install the plug in the cylinder head.

Element glows when energized.

Pliers

Replace the plug when the element does not glow or is burnt out.

Glow Plug Igniter

WARNING When checking the plug element hold the plug with tools, such as pliers, etc. Do not hold near your face or the fuel remaining in the filament may burn you.

Check that the current to the glowplug is

3. switched off.

To close the needle-valve, turn it clockwise,

while to open the needle-valve, turn it counter-clockwise. Turn the needle-valve clockwise slowly until it stops. This is the fully closed position.

Open the needle-valve 2-2.5 turns from the fully closed position and set the throttle in the fully open position.

Mark

Open

Fully closed position

1 4

Fully opened position

Apply the starter and press the starter switch for 5-6 seconds, or until fuel is seen to emerge from the exhaust outlet, indicating that the cylinder is now primed.

Turn the prop “backwards” (clockwise) by

7. hand until it is against compression. This is to enable the kinetic energy of the prop to subsequently assist the starter through the compression stroke to start the engine.

Energize the glowplug and apply the starter. If the starter fails to rotate the engine completely, this may be due to the cylinder being over-primed, or to the starter battery being insufficiently charged.

Page 14

Make sure that the direction or rotation is correct.

Electric starter

Check these conditions and, instead of

7. pressing the starter button after applying the starter, have the starter spinning before applying it to the engine, to give it a "running start". When the engine starts, slowly open the throttle, leaving the needle-valve at its rich starting setting to promote cool running conditions. However, if the engine slows down because the mixture is excessively rich, the needle-valve may be closed a little to speed it up until it runs evenly.

Now disconnect current to the glowplug and gradually close the needle-valve so that the rpm increases. Make adjustments to the needle in small steps. Abrupt changes at this stage are likely to cause the engine to stall. Restart the engine by simply applying the starter with the glowplug re-energized and the throttle at its starting setting.

How to stop the engine

Pull down the throttle lever and trim lever on the transmitter fully.

Note: Make sure that the throttle linkage is made so that the throttle is fully closed when the throttle lever as well as trim lever on the transmitter are fully pulled down.

All internal-combustion engines benefit from extra care when they are run for the first few timesknown as running-in or breaking-in. This allows the working parts to mate together under load at operating temperature. Therefore, it is vitally important to complete the break-in before allowing the engine to run continuously at high speed and before finalizing carburetor adjustments. However, because O.S. engines are produced with the aid of the finest modern precision machinery and from the best and most suitable materials, only a short and simple running-in procedure is called for and can be carried out with the engine installed in the model.

The recommended procedure is as follows:

Use the same fuel and prop as you intend for flying your model.

Open the needle-valve 2-2.5 turns from the

2. fully closed position and start the engine.

RUNNING-IN ("Breaking-in")

Open the throttle slowly to the mid speed position, and disconnect the current to the glowplug.

Now open the throttle slowly to the fully opened position and run the engine for no more than 5 seconds with the needle-valve tuned to produced near maximum r.p.m., then, immediately, slow the engine down again by opening the needle-valve approximately one turn. The rich mixture, so induced, will cool the engine, at the same time providing increased lubrication.

Repeat this process, alternately running the engine fast and slow by means of the needle-valve, while keeping the throttle fully open, then begin to extend the short periods of high-speed operation until two tanks of fuel have been consumed.

Page 15

WARNING: When ground running the engine, avoid dusty or sandy locations. If dust or grit is drawn into the engine, this can have a ruinous effect, drastically shortening engine life in a matter of minutes.

Following the initial running-in session, check

6. for any looseness in the installation due to vibration, then allow the engine a period of moderately rich operation in flight.

For the first flight, have the needle-valve set on the rich side and adjust the throttle trim on the transmitter so that the engine does not stop when the throttle is closed to the idle setting.

With each successive flight, close the

8. needle-valve very slightly until, at the end of about 10 flights, the needle is set for full power. Do not "over-lean" the mixture in an attempt to extract more power.

If overheating should be suspected at any time during flight (i.e.if the engine begins to "labor") reduce power by partially closing the throttle and land the aircraft to enable the needle-valve to be readjusted to a richer setting.

Start the engine, open the throttle fully and

1. set the needle-valve slightly rich (30-45°) from the highest r.p.m. setting.

Close the throttle to the idle position. Allow the engine to idle for about 5 seconds, then reopen the throttle. The engine should accelerate smoothly back to full speed.

If, instead, the engine responds sluggishly

3. and emits an excess of white smoke from the exhaust, the idle mixture is too rich. Turn the mixture control screw approx. 45° clockwise to lean the idle mixture.

On the other hand, if the engine hesitates

4. before picking up speed or even ceases firing completely, the idle mixture is likely to be too lean. Turn the mixture control valve 90° counter-clockwise to substantially enrich the mixture, then back again 45° clockwise.

IDLE MIXTURE ADJUSTMENT

In paragraphs 3 and 4 above, the 45° total

5. movements are, of course, approximate. It will be necessary to fine-tune the mixture control screw 10-15° at a time to reach the best setting for optimum throttle response.

Continue re-checking the idle mixture setting until the engine responds smoothly and positively to operation of the throttle at all times.

Page 16

REALIGNMENT OF MIXTURE CONTROL NOZZLE

In the course of making carburetor adjustments, it is just possible that the Mixture Control Nozzle may be inadvertently screwed in or out too far and thereby moved beyond its effective adjustment range.

Rotate the Mixture Control Nozzle until its slotted head is flush with the carburetor body. This is the basic position.

Mixture Control Nozzle

Carburetor Body

CARBURETOR CARE & MAINTENANCE

If you experience difficulty in obtaining a consistent mixture setting it could be due to foreign debris in the carburetor. Carefully disassemble the carburetor and wash in methanol. Do not use gasoline or kerosene that can effect the silicone rubber "O" rings.

Debris tends to accumulate in this area

VALVE ADJUSTING

Valve clearances are correctly set before any O.S. engine leaves the factory and, in normal use, will seldom require adjustment. However, if, after a considerable amount of running time, a loss of power is detected, or if he engine has been disassembled for repair, these clearances should be checked and reset as necessary. For checking and adjusting the valve clearances, a VALVE ADJUSTING TOOL KIT is available as an optional accessory.

The kit comes in a plastic case and includes: (Code No.72200060)

• Feeler gauge 0.04mm

• Feeler gauge 0.1mm

• Hex. key 1.5mm

• Wrench 5mm

CARE AND MAINTENANCE

Please pay attention to the matters described below to ensure that your engine serves you well in regard to performance, reliability and long life.

As previously mentioned, it is vitally important to avoid operating the engine in conditions where dust, disturbed by the propeller, may be deposited on the engine and enter its working parts.

Remember to keep your fuel container closed to prevent foreign matter from contaminating the fuel.

Install a fuel filter to prevent dirt and foreign matter in the fuel container from entering the fuel tank. O.S. Super Filters (L) and (S) are available as optional extras.

Page 17

Install an in-line fuel filter between the tank and carburetor to prevent dirt and foreign in the tank from entering the carburetor.

Clean these filters periodically.

If these precautions are neglected, restriction of fuel flow may cause the engine to cut out, or the fuel/air mixture to become too lean causing the engine to overheat.

The use of modern high-performance alcohol based model engine fuels, while promoting cooler running, improved anti-detonation combustion and increased power, have the disadvantage of causing corrosion due to the acid by-products of combustion. The use of nitromethane in the fuel can also contribute to the problem.

Do not close the needle-valve and mixture control valve too far as this will cause a lean setting and over heating of the engine. This can, in turn, create nitromethane oxide leading to internal rusting of the engine. Always adjust the needlevalve slightly on the rich side of peak rpm.

Do not leave unused fuel in the engine at the conclusion of a day’s flying. Accepted practice is to cut off the fuel supply while the engine is still running at full throttle, then expel as much fuel residue as possible by turning the engine over 5-10 seconds with the electric starter. Finally, inject some after-run oil through the glowplug hole and turn the engine over several times by hand.

When the engine is not to be used for some months (for example, as between flying seasons), a worthwhile precaution is to remove it from the airframe and, after washing off the exterior with alcohol (not gasoline nor kerosene), remove carefully the carburetor with intake pipe, glow plug and all silicone tubing and put them safely aside. Then, immerse the engine in a container of alcohol. Rotate the crankshaft while the engine is immersed. If foreign matter is visible in the alcohol, rinse the engine again in clean alcohol. Finally, shake off and dry the alcohol ,and inject some after-run oil in the glowplug hole and rotate the crankshaft several times by hand. Reinstall the carburetor with intake pipe and glowplug on the engine and keep it in a dry place after putting in a vinyl bag.

Page 18

Description

Rocker Cover

Rocker Arm Retainer (2pcs.)

Rocker Support (1pc.)

Rocker Arm (1pc.)

Tappet Adjusting Screw (1pair)

Valve Spring Retainer (1pc.)

Code No.No.

44604200

45761600

45261410

45261110

45761200

46160400

123456789

C...Cap Screw

Type of screw

Valve Spring Seat (2pcs.)

Valve Spring (1pc.)

Intake Valve (1pc.)

Exhaust Valve (1pc.)

Cylinder Head (W/Gasket)

Cylinder Head Gasket (1pc.)

Intake Manifold (1pc.)

Carburetor Complete (Type 40NA)

Piston Ring

Piston

Piston Pin

Connecting Rod

Cylinder Liner

Cover Plate

Crankshaft

Crankshaft Ball Bearing (Rear)

Crankcase

Camshaft Ball Bearing (1pc.)

Camshaft

44660300

44660200

44650000

44651000

44604100

44614100

44669400

44681000

44603400

44603200

44606000

44605000

44603100

44607000

44602000

44230000

44601000

45231100

45262010

1011121314151617181920212223242526272829303132

34-2

34-6

34-4

34-3

Cam Cover

Push Rod (2pcs.)

Push Rod Cover (1pc.)

Push Rod Cover "O" Ring (2pcs.)

Cam Follower (2pcs.)

Crankshaft Ball Bearing (Front)

Drive Hub (W/woodruff key)

Woodruff Key

44601100

44666000

44666100

27881840

45664000

26531005

45808000

27708200

32-1

Lock Nut Set

F-4040 Silencer Assembly

Silencer Body

Assembly Screw

Silencer Gasket (1pc.)

Pressure Nipple (No.7)

Exhaust Header Pipe Assembly

Exhaust Header Pipe Nut M10 (1pc.)

45810100

44625000

44625100

44625400

44625410

22681957

44625200

45626010

34-1

34-2

34-3

34-4

34-5

34-6

Glow Plug Type F

71615009

The specifications are subject to alteration for improvement without notice.

ENGINE EXPLODED VIEW & PARTS LIST

C.M2.6x10

34-5

C.M3x18

C.M3x12

34-1

C.M2.6x7

C.M2.6x18

C.M2.6x7

32-1

C.M3x8

Pcs. used in an engine

)

10pcs./sets (

Cam Cover Retaining Screw (2pcs.) Intake Manifold Retaining Screw (2pcs.)

Size

M2.6x7

Code No.

79871020

CAP SCREW SETS

Rocker Support Retaining Screw (1pc.)

Cylinder Head Retaining Screw (5pcs.)

Cover Plate Retaining Screw (4pcs.)

Carburetor Retaining Screw (2pcs.)

Rocker Cover Retaining Screw (2pcs.)

M2.6x10

M2.6x18

M3x8

M3x12

M3x18

79871030

79871055

79871110

79871140

79871180

Page 19

N.+M3x6

1-1

CARBURETOR EXPLODED VIEW

3-1

C.M2.6x18

3-2

S.M3X3

8-4

8-5

8-1

8-2

8-3

S.M3X3

Type of screw

C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw

No.

Code No.

22081408

1-1

22081313

44681200

44681600

3-1

46066319

3-2

24881824

21285220

44281100

45115000

22681953

44281900

8-1

44281970

8-2

24981837

8-3

26381501

8-4

27381940

8-5

26711305

44681300

9-1

26381501

79871055

Specifications are subject to alteration for improvement without notice.

9-1

CARBURETOR PARTS LIST

Throttle Lever Assembly Throttle Lever Retaining Screw Carburetor Rotor Mixture Control Nozzle Assembly "O" Ring (L) (2pcs.) "O" Ring (S) (2pcs.) Rotor Guide Screw Carburetor Body Carburetor Rubber Gasket (1pc.) Fuel Inlet (No.1) Needle Valve Assembly Needle Assembly "O" Ring (2pcs.) Set Screw Needle Valve Holder Assembly Ratchet Spring Air Funnel Set Screw Carburetor Retaining Screw (10pcs.)

Description

Page 20

RADIAL MOTOR MOUNT

(71913000)

PROPELLER LOCKNUT SET

(For Spinner)

(45810200)

PROPELLER LOCKNUT SET FOR 4C SPINNER

1/4"-M5

(45810300)

SUPER FILTER

(L)

(72403050)

Needle Valve Extension Cable Set

(72200080)

O.S. GENUINE PARTS & ACCESSORIES

FLEXIBLE EXHAUST PIPES

Type

Code.No.

72108300 72108310

1010A 1010B

Length (mm)

120mm 240mm

VALVE ADJUSTING TOOL KIT

(72200060)

The specifications are subject to alteration for improvement without notice.

NON-BUBBLE WEIGHT

(71531000)

NON-BUBBLE WEIGHT

(S)

(71531010)

LONG SOCKET WRENCH WITH PLUG GRIP

(71521000)

SPECIFICATIONS

Displacement Bore Stroke Practical R.P.M. Power output Weight

9.32 cc / 0.569 cu.in.

24.0 mm / 0.945 in.

20.6 mm / 0.811 in.

2.400-13.000 r.p.m.

1.0 ps / 10.000r.p.m. 419 g / 14.8 oz.

F-4040 Silencer Assembly

42 g / 1.48 oz.

R0.5

34.1

UNF1/4-28

THREE VIEW DRAWING

4- 3.7

15.2

50.3

17.5

32.5

43.3

Dimensions(mm)

Page 21

MEMO

URL : http://www.os-engines.co.jp

6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan

TE L. (06) 6702-0225

FAX. (06) 6704-2722

60091920 040801