User Manual

ManualsBrandsOS Engines ManualsAirplanesFSa-72II Airplane Engine with F-5030 Silencer

Table Of Contents

60093300 061700

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

REALIGNMENT OF MIXTURE CONTROL VALVE

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

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, 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.

(71905010)

(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

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

TEL. (06) 6702-0225 FAX. (06) 6704-2722

The specifications are subject to alteration for improvement without notice.

(72506100)

2.5mm x 1000mm

O.S. SPEED SILICONE FUEL LINE

1/4

Open the needle-valve 2.5-3 turns from the fully

closed position and set the throttle in the fully open

position.

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 2.5-3 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 valve

approx. 45 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 valve 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 Valve

Carburetor Body

In the course of making carburetor adjustments, it is

just possible that the Mixture Control Valve 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

(72109680)

M11 INVERTED 80D

IN-COWL EXHAUST HEADER PIPE

M11 SIDE 60D

(72109690)

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 N...Round Head Screw

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.)

No.

Code No.

Description

Type of screw

N...Round Head Screw S...Set Screw

Description

Code No.

No.

Rotate the Mixture Control

Valve until its slotted head is

flush with the carburetor

body. Then, screw it in by

1mm (two turns). This is the

basic position.

(72200080)

NEEDLE VALVE EXTENSION CABLE SET

79871020

79871030

79871110

79871150

79871200

M2.6x7

M2.6x10

M3x8

M3x15

M3x20

Code No.

Size

Pcs. used in an engine

Rocker Cover (BLACK)

Rocker Arm Retainer (2pcs.)

Rocker Support (1pc.)

Rocker Arm (1pc.)

Tappet Adjusting Screw (1pair)

Split Cotter (2pcs.)

Valve Spring Retainer (1pc.)

Valve Spring (1pc.)

Intake Valve (1pc.)

Exhaust Valve (1pc.)

Cylinder Head (W/Gasket)

Cylinder Head Gasket (1pc.)

Intake Manifold (1pc.)

Carburetor Complete (Type 61N)

Piston Ring

Piston

Piston Pin

Connecting Rod

Cylinder Liner

Nipple N0.1

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-5030 Silencer Assembly

Silencer Body

Assembly Screw

Silencer Gasket (1pc.)

Pressure Nipple (No.7)

Exhaust Header Pipe Assembly

Exhaust Header Pipe Nut M11 (1pc.)

Glow Plug Type F

N.+M3x6

S.M3x3

1-1

9-1

S.M3X3

N.+M3x22

2-1

1-2

7-1

7-2

10-1

Needle Assembly

"O" Ring (2pcs.)

Set Screw

Needle Valve Holder Assembly

Ratchet Spring

Carburetor Body

Fuel Inlet (No.1)

Carburetor Rubber Gasket (1pc.)

Rotor Guide Screw

Mixture Control Valve Assembly

"O" Ring (L) (2pcs.)

"O" Ring (S) (2pcs.)

Carburetor Rotor

Throttle Lever Assembly

Throttle Lever Retaining Screw

Velocity Stack

Set Screw

Carburetor Retaining Screw (2pcs.)

1-1

1-2

2-1

7-1

7-2

9-1

10-1

44881970

24981837

26381501

27381940

26711305

44381100

22681953

46115000

45581820

45582300

46066319

24881824

44381200

22081408

22081313

44381300

26381501

45581700

21.3

49.5

59.5

44.1

103.6

108

33.7

UNF1/4-28

4- 3.7

Displacement

Bore

Stroke

Output

Practical R.P.M.

Weight

(Engine)

(Silencer)

SPECIFICATIONS

11.79 cc / 0.719 cu.in.

27.0 mm / 1.063 in.

20.6 mm / 0.811 in.

1.2 ps / 1.18 hp / 11.000 r.p.m.

2,400-12,500 r.p.m.

476 g / 16.79 oz.

54 g / 1.9 oz.

11-1

32-1

34-1

34-2

34-3

34-4

34-5

34-6

44304210

45761600

45961410

44861000

45061202

45960400

45960310

45960210

44750100

44751100

44304110

44714100

44369400

44381000

44303400

44303200

44306000

44305000

44303100

22681953

44307010

44302000

44230000

44301000

45231100

44362000

44301100

44366000

44366100

27881840

45664000

26531005

44308000

27708200

45810100

44825000

44825100

44825400

44625410

22681957

44825200

45626030

71615009

C.M3x15

C.M3x20

C.M2.6x10

C.M2.6x7

N.+M3x22

C.M3x8

C.M2.6x7

32-1

11-1

34-3

34-4

34-2

34-1

34-6

34-5

34-3