Table of Contents
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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.
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Table of Contents
Related Manuals for O.S. engine FS-40S
Summary of Contents for O.S. engine FS-40S
- 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. 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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Page 2: Table Of Contents
CONTENTS SAFETY INSTRUCTIONS AND WARNINGS RUNNING -IN ABOUT YOUR O.S. ENGINE CARBURETOR INTRODUCTION,BASIC ENGINE PARTS CARBURETOR AIR-BLEED ADJUSTMENT INSTALLATION TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START INSTALLATION OF CHOKE ROD, NEEDLE VALVE EXTENSION, EXHAUST PIPE ADJUSTMENT(FS-26S) VALVE ADJUSTING SILENCER, CARE AND MAINTENANCE LINKAGE OF THROTTLE LEVER THREE VIEW DRAWING... -
Page 3: Safety Instructions And Warnings About Your O.s. Engine
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. As owner, you, alone, are responsible for the safe operation of your engine, so act with discretion and care at all times. - Page 4 WARNINGS • Never touch, or allow any object to come • Model engine fuel is also highly flammable. Keep it away from open flame, into contact with, the rotating excessive heat, sources of sparks, or propeller and do not crouch anything else which might ignite over the engine when it is it.
- Page 5 NOTES • • This engine was designed for model If you remove the glowplug from the engine aircraft. Do not attempt to use it for any and check its condition by connecting the other purpose. battery leads to it, do not hold the plug with bare fingers.Use an appropriate tool or a •...
- Page 6 NOTES • Always check the tightness of the propeller • Discard any propeller which has become nut and retighten it, if necessary, before split, cracked, nicked or otherwise rendered restarting the engine, particularly in the unsafe. Never attempt to repair such a case of four-stroke-cycle engines.
- Page 7 NOTES • • Adjust the throttle linkage so that the engine For their safety, keep all onlookers stops when the throttle stick and trim lever (especially small children) well back (at on the transmitter are fully retarded. least 20 feet or 6 meters) when preparing Alternatively, the engine may be stopped by your model for flight.
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Page 8: Introduction,Basic Engine Parts
Carburetor manufacturing company; a company which Exhaust pipe also pioneered the quantity production of model four-cycle engines. Propeller nut Accessories FS-40S FS-26S •Silencer Body •Silencer Assembly •Choke rod •Choke rod Fuel inlet •Silicone tubing •Silicone tubing... -
Page 9: Installation
Rigid hardwood (e.g. maple) 3.5mm steel screw At least for FS-40S At least 12mm 15mm(19/32") for FS-40S (1/2") for FS-26S Hardwood mounting beams Make sure that the mounting beams are parallel 3mm steel Allen screw for FS-26S and that their top surfaces are in the same plane. -
Page 10: Installation Of Choke Rod, Needle Valve
INSTALLATION OF CHOKE ROD NEEDLE VALVE EXTENSION The needle-valve supplied with this engine is The FS Series engines are equipped with self- designed to incorporate an extension so that, when reopening choke valves. the engine is enclosed within the fuselage, the Cut the choke rod (supplied) to the length indicated, needle-valve may be adjusted from the outside. -
Page 11: Silencer
SILENCER LINKAGE OF THROTTLE LEVER The FS-26S and FS-40S are supplied with silencers First, ensure that the throttle rotor is fully closed when as standard equipment. the throttle-lever is in the closed position. Adjust rotor stop screw if necessary. Then couple the lever to the... - Page 12 7 Fuel tank Resistance coil For installation in the model, a 120cc(4.2oz.) (nichrome wire) for FS-26S, a 150cc(5oz.) for FS-40S tank is suggested. Fuel bulb 8 Fuel bottle or pump Fuel pumps For filling the fuel tank, a simple, polyethylene "squeeze"...
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Page 13: Fuel And Pressure Lines
9 Electric starter and starter battery Note: When cutting silicone tubing··· An electric starter is recommended Silicone tubing for starting. 10 Fuel can filter Install a filter in the outlet line of your refuelling container to prevent entry of Do not use wire cutters foreign matter into the fuel tank. -
Page 14: Advice On Selection Of Fuel, Gloeplug & Propeller 13
ADVICE ON SELECTION OF FUEL, GLOWPLUG & PROPELLER Methanol Fuel Castor Oil Use a good quality commercial fuel or one of the Nitromethane blends shown in the table. Fuel "A" is suitable for Reminder! running-in and ordinary use. Fuel "B" is for use when more power is required and for improved Model engine fuel is poisonous. - Page 15 Do not run the engine too lean and do not leave the GLOWPLUG battery connected while adjusting the needle. The FS-26S and FS-40S are supplied with an O.S. Type F glowplug, specially designed for O.S. four- When to replace the glowplug stroke engines.
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Page 16: Starting The Engine 15
Propeller pump. Locknut Set (optional extra) with the FS-40S. Tighten the propeller nut Fuel pump firmly so that compression is first felt around this position(i.e. with blades... - Page 17 Turn the propeller 3 of arrow from the closed position. to 4 turns counter- FS-26S (3 to 3-1/2 turns) clockwise smartly FS-40S (2-1/2 to 3 turns) by finger in the Open the throttle fully direction of arrow. Fully opened position Turn approx.
- Page 18 Hold model securely when starting Heat glowplug Assistant should hold the model so that it cannot move forward when the engine starts. Glowplug battery. Starting battery Place as far to the rear as possible. Assistant Connect battery leads as shown (polarity is immaterial.) Starter Be careful not...
- Page 19 Check that the throttle is one-third open from the fully Needle-valve adjustment(1) closed position. Bring the starter into contact with the Slowly advance throttle to its spinner nut or spinner and depress the starter switch fully open position, then for one or two seconds. Repeat if necessary. When gradually close the needle- valve until the exhaust sound the engine fires, withdraw the starter immediately.
- Page 20 Needle-valve adjustment(2) Needle-valve adjustment(Summary) As the needle-valve is closed beyond the initial readjustment, Practical best(optimum) needle-valve setting the rpm of the engine will be increased and a continuous high- pitched exhaust note, only, will be heard. Maximum rpm setting("Lean"). Key to the needle-valve "Rich"...
- Page 21 Subsequent starting procedure On starting from cold, with the needle-valve Once the optimum needle-valve setting has been set at the rich starting position: established (see "Needle-valve adjustment- a good deal of white smoke is emitted. Summary") the procedure for starting is simplified as follows: As the needle-valve is closed and the r.p.m.
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Page 22: Running -In
How to stop the engine RUNNING-IN ("Breaking-in") All internal-combustion engines benefit, to some degree, from extra care when they are run for the first Close the throttle to reduce to the lowest possible r.p.m. few times - known as running-in or breaking-in. This is because the working parts of a new engine take a little time to settle down after being subjected to high Close... -
Page 23: Carburetor 22
CARBURETTOR These engines are equipped with a throttle type car- burettor which provides a wide range of engine speed control. With the throttle lever linked to a suitable servo in the model, movement of the throttle control on the transmitter will enable engine to be varied, proportionally, from idling speed to full power. - Page 24 Start the engine. Make sure that the throttle is fully open. 20-30 open from maximum Adjust the neede-valve. r.p.m. setting. Close the throttle gradually. The position where the lowest Find the idling position. possible r.p.m. ,with steady running, is obtained. Set the throttle opening by Fix the idling position.
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Page 25: Carburetor Air-Bleed Adjustment
CARBURETTOR AIR-BLEED ADJUSTMENT Pre-Flight Check Start engine and adjust needle- valve as previously described. Close the throttle gradually. Find the idling position. approx. ˚ Hold the model. Hold model level, then slowly raise its nose. If rpm increases. If engine runs unevenly or stops. Stop the engine. -
Page 26: Trouble Shooting When The Engine Fails To Start 25
TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START Four key points For quick, reliable starting, the following four conditions are required. 1 Good compression. 2 Adequate "glow" at glowplug. 3 Correct mixture. 4 Sufficient electric starter rotating speed. If the engine fails to start, or does not keep running after being started, check symptoms against the following chart and take necessary corrective action. - Page 27 Corrective action Cause Symptom Factor ..Incorrect heating of Voltage too high or too low. Re-check and readjust referring to "BEFORE Engine fires glowplug. STARTING" paragraph 4..intermittently but Over priming.
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Page 28: Valve Adjusting 27
Note: VALVE ADJUSTING Valve clearances of all O.S. four-stroke-cycle ALL O.S. four-stroke engines have their valve(tappet) engines must be checked and reset ONLY WHEN clearances correctly set before they leave the factory. THE ENGINE IS COLD. However, if, after many hours of running time have Procedure is as follows: been logged, a loss of power is detected, or if the ( 1 ) - Page 29 Note: ( 2 ) If a clearance is found to be outside either of If the gap is found to be less than 0.04mm, it is these limits, it should be reset as follows. not necessary to readjust the clearance if the Carefully loosen the locknut on rocker-arm 1/4-1/2 engine has good compression and starts easily.
- Page 30 Remove 0.04mm feeler, rotate prop through two Insert 0.04mm feeler gauge between valve stem revolutions and recheck gap. and rocker-arm and gently turn adjusting screw clockwise until it stops.(Fig.4.) If clearance is correct, loosen the locknut on the other rocker-arm and repeat steps 1 to 5 above. Turn with fingers until it stops.
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Page 31: Care And Maintenance
Do not leave raw fuel in the engine at the CARE AND MAINTENANCE conclusion of a flying session: it may cause To ensure that you obtain long life and peak performance corrosion. The best practice is to disconnect the from your engine, observe the following. fuel line from the carburettor while the engine is running. -
Page 32: Three View Drawing
THREE VIEW DRAWING FS-26S/FS-40S Specification FS-26S Displacement 4.41 cc ( 0.269 cu.in. ) Bore 18.5mm ( 0.728 in. ) Stroke 16.4mm ( 0.648 in. ) Practical R.P.M. 2,200 12,000 r.p.m. Power output 0.41 bhp / 11,000 r.p.m. Weight 268g ( 9.45 oz. ) -
Page 33: Engine Exploded View 32
FS-26S ENGINE EXPLODED VIEW C.M2.6X12 C.M2.6X18 C.M2.6X7 C.M2.6X7 C.M2.6X7 Type of screw C Cap Screw B Binding Head Screw M Oval Fillister-Head Screw F Flat Head Screw N Round Head Screw S Set Screw... -
Page 34: Carburetor
FS-26S PARTS LIST Code No. Description Screw Set 4 4113 000 Rocker Cover 4 5704 200 Rocker Support Assembly 4 5761 400 Rocker Support 4 5761 410 Rocker Arm Retainer (2pcs.) 4 5761 600 Rocker Arm Assembly (1pair) 4 5761 000 Rocker Arm (1pc.) 4 5761 100 Tappet Adjusting Screw... - Page 35 FS-40S ENGINE EXPLODED VIEW C.M2.6X12 C.M3X18 C.M2.6X7 C.M2.6X7 C.M3X8 Type of screw C Cap Screw B Binding Head Screw M Oval Fillister-Head Screw F Flat Head Screw N Round Head Screw S Set Screw...
- Page 36 FS-40S PARTS LIST Description Code No. 4 5213 010 Screw Set Rocker Cover 4 5204 210 Rocker Support Assembly 4 5261 400 3 -1 Rocker Support 4 5261 410 3 -2 4 5761 600 Rocker Arm Retainer (2pcs.) Rocker Arm Assembly (1pair)
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Page 37: Carburetor Exploded View
CARBURETTOR EXPLODED VIEW TYPE FS-26S Code No. Description & PARTS LIST Throttle Lever Assembly 22081408 Throttle Lever Retaining Screw 22081313 TYPE FS-26S/FS-40S Carburetor Rotor 45281200 Carburetor Body 45281100 Carburetor Retaining Screw(3pcs.) 45281700 Throttle Stop Screw 22081811 Needle-valve Assembly 45281910 Needle... -
Page 38: Genuine Parts & Accessories
PARTS & ACCESSORIES Valve Adjusting Propeller Locknut Set Radial Mount Set O.S.Glow Plug For 40S ( 45810100 ) Tool Kit For 26S ( 71908300 ) TYPE F For 40S ( 71906000 ) ( 72200060 ) ( 71615009 ) Super Filter (L) Spinner Nut ( 72403050 ) For 40S 1/4''-28 ( 23024008 ) -
Page 39: Memo
MEMO... - Page 40 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 URL : http://www.os-engines.co.jp Copyright 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 110101...
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