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ManualsBrandsOS Engines ManualsAirplanesFSa-56II Airplane Engine with F-4040 Silencer

Table Of Contents

60093290 061700

REALIGNMENT OF MIXTURE CONTROL NOZZLE

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 dust in the fuel

container from entering the fuel tank. O.S. Super

Filters (L) and (S) are available as optional extras.

Install an in-line fuel filter between the tank and

carburetor to prevent dirt and dust in the tank from

entering the carburetor.

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.

Clean these filters periodically.

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 needlevalve and mixture control

Nozzle 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, 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 and glowplug on the engine

and keep it in a dry place after putting in a vinyl bag.

(71913000)

(71531000)

(71531010)

O.S. GENUINE PARTS & ACCESSORIES

RADIAL MOTOR MOUNT

NON-BUBBLE WEIGHT

NON-BUBBLE WEIGHT (S)

(72403050)

SUPER FILTER

(

)

(71521000)

LONG SOCKET WRENCH WITH PLUG GRIP

ENGINE EXPLODED VIEW & PARTS LIST

CARBURETOR EXPLODED VIEW & PARTS LIST

Dimensions(mm)

THREE VIEW DRAWING

(72506100)

2.5mm x 1000mm

O.S. SPEED SILICONE FUEL LINE

1/4

Mark

Open

Fully closed

position

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.

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.

Turn the prop “backwards” (clockwise) by 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.

Check these conditions and, instead of 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.

10.

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.

How to stop the engine

Pull down the throttle lever and trim lever on the

transmitter fully.

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.

RUNNING-IN ("Breaking-in")

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 fully

closed position and start the engine.

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.

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 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 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.

IDLE MIXTURE ADJUSTMENT

Start the engine, open the throttle fully and 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 and emits

an excess of white smoke from the exhaust, the idle

mixture is too rich. Turn the mixture control Nozzle

approx. 30 clockwise to lean the idle mixture.

On the other hand, if the engine hesitates before

picking up speed or even ceases firing completely,

the idle mixture is likely to be too lean. Turn the

mixture control Nozzle 90 counter-clockwise to

substantially enrich the mixture, then back again 45

clockwise.

In paragraphs 3 and 4 above, the 45 total

movements are, of course, approximate. It will be

necessary to fine-tune the mixture control valve

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.

Mixture Control Nozzle

Carburetor Body

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.

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.

• Feeler gauge 0.04mm

The kit comes in a plastic case and includes:

(Code No.72200060)

• Feeler gauge 0.1mm

• Hex. key 1.5mm

• Wrench 5mm

PROPELLER LOCKNUT SET FOR SPINNER

1/4"-M5

(45810200)

(45810300)

1/4"-M4

(72109660)

M10 INVERTED 80D

IN-COWL EXHAUST HEADER PIPE

M10 SIDE 60D

(72109670)

VALVE ADJUSTING TOOL KIT

(72200060)

(72200200)

BOOSTER CABLE SET FOR SINGLE CYLINDER

(72200170)

(72200171)

(72200190)

(72200180)

Plug Cable Set

Plug Cable

Plug Terminal

Earth Cable 5

Type of screw

C...Cap Screw

Type of screw

C...Cap Screw N...Round Head Screw S...Set Screw

(72200080)

NEEDLE VALVE EXTENSION CABLE SET

Rotate the Mixture Control

Nozzle until its slotted

head is flush with the

carburetor body. This is the

basic position.

N.+M3x6

S.M3X3

1-1

3-1

3-2

8-1

8-2

8-3

8-4

8-5

C.M2.6x18

9-1

S.M3X3

1-1

3-1

3-2

8-1

8-2

8-3

8-4

8-5

9-1

22081408

22081313

44681200

44681600

46066319

24881824

21285220

44281100

45115000

22681953

44281900

44281970

24981837

26381501

27381940

26711305

44681300

26381501

79871055

CAP SCREW SETS

(

10pcs./sets

)

Rocker Support Retaining Screw (1pc.)

Cylinder Head Retaining Screw (5pcs.)

Cover Plate Retaining Screw (4pcs.)

Cam Cover Retaining Screw (2pcs.)

Intake Manifold Retaining Screw (2pcs.)

Rocker Cover Retaining Screw (2pcs.)

79871020

79871030

79871055

79871110

79871140

79871180

M2.6x7

M2.6x10

M2.6x18

M3x8

M3x12

M3x18

Pcs. used in an engine

Size

Code No.

Carburetor Retaining Screw (2pcs.)

Rocker Cover

Rocker Arm Retainer (2pcs.)

Rocker Support (1pc.)

Rocker Arm (1pc.)

Tappet Adjusting Screw (1pair)

Valve Spring Retainer (2pcs.)

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

Nipple No.1

Cover Plate

Crankshaft

Crankshaft Ball Bearing (Rear)

Crankcase

Camshaft Ball Bearing (1pc.)

Camshaft

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

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.)

Glow Plug Type F

No.

Code No.

Description

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

Velocity Stack

Set Screw

Carburetor Retaining Screw (10pcs.)

No.

Code No.

Description

Displacement

Bore

Stroke

Output

Practical R.P.M.

Weight

(Engine)

(Silencer)

SPECIFICATIONS

9.32 cc / 0.569 cu.in.

24.0 mm / 0.945 in.

20.6 mm / 0.811 in.

1.0 ps / 0.99 hp / 10.000 r.p.m.

2.400-13.000 r.p.m.

419 g / 14.8 oz.

42 g / 1.48 oz.

The specifications are subject to alteration for improvement without notice.

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

6-15 3-Chome Imagawa Higashisumiyoshi-ku

Osaka 546-0003, Japan

TEL. (06) 6702-0225

FAX. (06) 6704-2722

C.M3x12

C.M3x18

C.M2.6x10

C.M2.6x7

C.M2.6x18

C.M3x8

C.M2.6x7

32-1

34-3

34-4

34-2

34-1

34-6

34-5

11-1

32-1

34-1

34-2

34-3

34-4

34-5

34-6

44604220

45761600

45261410

45261110

45761200

46160400

44660300

44660200

44650000

44651000

44604110

44614100

44669400

44681000

44603400

44603200

44606000

44605000

44603100

22681953

44607010

44602000

44230000

44601000

45231100

45262010

44601100

44666000

44666100

27881840

45664000

26531005

45808000

27708200

45810100

44625000

44625100

44625400

44625410

22681957

44625200

45626010

71615009

UNF1/4-28

50.3

43.3

15.2

17.5

4- 3.7

32.5

34.1

R0.5