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.
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.
NOTES This engine was designed for model aircraft. Do not attempt to use it for any other purpose. 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. Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts.
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. 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.
ABOUT THE ENGINE This is a FS (Alpha) series of the single cylinder overhead valve four cycle engine equipped with a fuel pump system. It offers broad power band to suite a variety models types. The PD-08 pump designed for bigger models and the 70R carburetor integrated with regulator ensures stable fuel delivery irrespective of model attitude and fuel level change.
BEFORE STARTING Tools, accessories, etc. The following items are necessary for operating the engine. 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.
Fuel Tank Electric Starter and Starter Battery A fuel tank of approximately 430cc capacity is suggested. This allows around 10-11 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. Electric Starter Required when starting 12-Volt lead-acid battery the engine. O.S.
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 5mm 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.
THROTTLE LINKAGE 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. For this purpose, a Needle Valve Extension Cable Set is supplied with the engine.
The exhaust outlet of the silencer can be rotated to any desired position in the following manner: 1) Loosen the locknut and assembly screw. 2) Set the exhaust outlet at the required position by rotating the rear part of the silencer. 3) Re-tighten the assembly screw, followed by the locknut. Note: If the silencer is enclosed within a cowl. it must be supplied with cooling air. If cooling is insufficient, the joint O ringe will deteriorate or melt in a short period of time.
PROPELLER 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. Propeller washer Locknut Obviously, this can be very hazardous. To eliminate such dangers, the O.S. Safety Locknut Assembly was devised.
MIXTURE CONTROLS TYPE 70R 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.
STARTING The FS -155-P 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 draw fuel to the cylinder automatically. Starting procedure is as follows: Element glows when energized. Pliers Replace the plug when the element does not glow or is burnt out. 1. Fill the fuel tank with fuel.
9. 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. Make sure that the direction or rotation is correct. Electric starter 8.
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. 8. 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.
REALIGNMENT OF MIXTURE CONTROL VALVE CARBURETOR CARE & MAINTENANCE 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. 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.
Install an in-line fuel filter between the tank and carburetor to prevent dirt and foreign matter in the tank from entering the carburetor. 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. Clean these filters periodically.
35 Code No. 42504200 45761600 42561400 42561100 44561200 45560410 45560310 42560200 45560130 44551000 42504100 42501460 42569400 42581000 42503400 42503200 42506000 28117000 42505000 42503100 72508100 42507000 29061410 42502000 27930000 42501000 45231100 42562000 21921800 42501100 46166000 42566100 45566310 44564000 29431000 45520000 42508000 45508200 45910100 42525000 42525100 42525300 42525310 42526000 45526032 72200080 71615009 Description Rocker Cover Rocker Arm Retainer (2pcs.) Rocker Support (1pc.
CARBURETOR EXPLODED VIEW 3 N.+M3x6 1-1 5 3-1 1 3-2 2 4 7 6 7-1 N.+M3x22 S.M3x3 11 8-2 9 S.M3x3 10-1 8-1 8 Type of screw C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw 10 36 CARBURETOR PARTS LIST No. Code No.
O.S.
MEMO 40 URL : 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 Copyright 2010 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
