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 MAX-15
Summary of Contents for O.S. engine MAX-15
- 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 STARTING THE ENGINE SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE RUNNING-IN (Breaking-in) INTRODUCTION TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START INSTALLATION OF THE ENGINE CARE AND MAINTENANCE INSTALLATION OF SILENCER ENGINE EXPLODED VIEW & NEEDLE-VALVE LOCATION PARTS LIST... -
Page 3: Safety Instructions And Warnings About Your O.s. Engine
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. - 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
INTRODUCTION Cylinder head The "LA-S Series" engines are designed for control line Glowplug models. They have broad power characteristics which are suitable for both trainer models and stunt models. A separate needle-valve is mounted at the rear, where manual adjustment is safely away from the rotating propeller. -
Page 9: Installation Of The Engine
How to fasten the mounting screws. INSTALLATION Installation in the model Tighten second nut firmly down onto first nut. O.S. radial motor mount A typical method of beam (Available as an optional extra part. 3mm steel nuts mounting is shown below,left. Tighten this nut first. -
Page 10: Installation Of Silencer
NEEDLE-VALVE EXTENSION Assembly screw Cone baffle The needle-valve supplied with these engines is Turn to requlred position designed to incorporate an extension so that, when the engine is enclosed within the fuselage, the needle-valve may be adjusted from the outside. Exhaust outlet Cut a commercially available rod to the required length, bend one end to an L shape, insert it into... -
Page 11: Before Starting 10
Remove the two cover-plate screws which secure BEFORE STARTING the needle-valve assembly bracket, then carefully Tools, accessories, etc. remove the two screws by which the needle-valve The following items are necessary for operating the unit is attached to the bracket. engine. - Page 12 Warning (Very hot) Resistance coil 8 Fuel bottle or pump (nichrome wire) For filling the fuel tank, a simple, Never touch polyethylene "squeeze" bottle, the nichrome with a suitable spout,is all that is wire while For tightening required. Alternatively, one of the the battery is glowplug purpose-made...
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Page 13: Plumbing And Fuel Tank Position
PLUMBING AND FUEL TANK POSITION Silencer (muffler) pressurized fuel system Make sure that there are no kinks or folds in the To reduce variation in fuel "head" and ensure steady plumbing. fuel delivery at the carburettor, it is advisable to employ Measurement A (height from the bottom surface of the mounting lug a silencer (muffler) pressurized fuel system, i.e. - Page 14 Running-in Aerobatic & Sport 15LA-S Methanol 25LA-S 9 6,10 5 Castor Oil 40LA-S 11 5 11 5 Nitromethane 46LA-S 11 6 11 6 7,12 5 Reminder! Model engine fuel is poisonous. Do not GLOWPLUG allow it to come into contact with the eyes or An O.S.
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Page 15: Starting The Engine
Glowplug life STARTING THE ENGINE Preparations Particularly in the case of very high performance engines, glowplugs must be regarded as expendable Installing the glowplug However, plug life can be extended and engine Install the washer on the glowplug and performance maintained by careful use, i.e.: screw carefully into cylinder-head, •... - Page 16 Warning: When using a spinner assembly, make Opening and closing of the needle-valve sure that the notches in the spinner shell are large enough to clear the propeller blades and so Close do not cut into and weaken the blade roots. Tighten the spinner nut firmly so that compression is first felt as indicated (i.e.
- Page 17 Priming Hold model securely when starting Assistant should hold Fuel Tube the model so that it cannot move forward when the engine starts. Glowplug battery. Fuel inlet Place your finger Place as far to the rear as possible. over the venturi to choke intake.
- Page 18 Apply electric starter Bring the starter into contact with the spinner nut or spinner and depress the starter switch for one or two seconds. Repeat if necessary. When the engine fires, withdraw the starter immediately. Attention: Never place your finger over the carburettor intake when applying the starter.
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Page 19: Important Note
Needle-valve adjustment(2) Needle-valve adjustment(1) Then gradually close the needle-valve until the exhaust sound As the needle-valve is closed beyond the initial readjustment, changes from an irregular pitch (four-cycle) to a steady pitch the r.p.m. of the engine will be increased and a continuous (two-cycle). - Page 20 Needle-valve adjustment(Summary) On starting from cold, with the needle-valve Practical best(optimum) needle-valve setting Maximum rpm setting("Lean"). set at the rich starting position: Clear, high-pitched two-stroke 20~30˚ a good deal of white smoke is emitted, accompanied by exhaust note "Rich" needle-valve a relatively low-pitched "four-stroke"...
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Page 21: Running-In (Breaking-In)
Subsequent starting procedure RUNNING-IN ("Breaking-in") Once the optimum needle-valve setting has been All internal-combustion engines benefit, to some established (see "Needle-valve adjustment- degree, from extra care when they are run for the first Summary") the procedure for starting is simplified as few times - known as running-in or breaking-in. -
Page 22: Trouble Shooting When The Engine Fails To Start 21
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 23 Cause Corrective action 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 24: 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. delivery tube from the venturi while the engine is running. -
Page 25: Exploded View
-15/25LA-S) EXPLODED VIEW (MAX M.M2.6X10(15LA-S) N.+M3X12(25LA-S) M3.5 B.M2.6X8 S.3X3 Type of screw C … Cap Screw M … Oval Fillister-Head Screw F … Flat Head Screw N … Round Head Screw S … Set Screw... - Page 26 -15/25LA-S) (MAX ENGINE PARTS LIST Code No. Description 25LA-S 15LA-S 22554000 Cylinder Head 21754000 Cylinder & Piston Assembly 21753000 22553000 Piston Pin 21706000 22606009 Connecting Rod 21205040 22405013 Venturi 22312000 21712010 Nozzle For Remote Needle 21381970 21381980 Propeller Nut 20810007 23210007 Propeller Washer 21109005...
- Page 27 -40/46LA-S) EXPLODED VIEW (MAX N.+M3X12 N.+M3X8 M3.5 S.3X3 r -3 r -4 r -5 r -2 r -6 r -1 Type of screw C … Cap Screw M … Oval Fillister-Head Screw F … Flat Head Screw N … Round Head Screw S … Set Screw...
- Page 28 ENGINE PARTS LIST -40/46LA-S) (MAX Code No. Description 40LA-S 46LA-S Cylinder Head 24004000 24004100 Cylinder & Piston Assembly 24003010 24003100 Piston Pin 23356000 45806000 Connecting Rod 24005000 Venturi 23312000 Nozzle For Remote Needle 21381980 Propeller Nut 23210007 Propeller Washer 24009000 Drive Hub 24008000 Thrust Washer...
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Page 29: Three View Drawing 28
MAX-15/25LA-S THREE VIEW DRAWING Dimensions(mm) 15LA-S SPECIFICATIONS 2.49 cc ( 0.1517 cu.in. ) Displacement 15.2mm ( 0.598 in. ) Bore 13.7mm ( 0.539 in. ) Stroke Practical R.P.M. 2,500 18,000 r.p.m. 0.41 bhp / 17,000 r.p.m. Power output 129.5g ( 4.56 oz. ) - Page 30 MAX-40/46LA-S THREE VIEW DRAWING Dimensions(mm) 40LA-S SPECIFICATIONS 6.49 cc ( 0.396cu.in. ) Displacement 21.2 mm ( 0.835in. ) Bore 18.4 mm ( 0.724in. ) Stroke Practical R.P.M. 2,000 16,000 r.p.m. Power output 1.0 bhp / 15,000 r.p.m. 267.5g ( 9.43oz. ) Weight 46LA-S SPECIFICATIONS 7.64 cc ( 0.467cu.in.
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Page 31: Optional Parts & Accessories
O.S. GENUINE PARTS & ACCESSORIES SUPER FILTER ( L ) RADIAL MOTOR MOUNT SILENCER EXTENSION GLOW PLUG ADAPTORS (72403050) (71605300) (71909310) for 15LA-S (21125108) for 15LA-S (71908100) for 25LA-S (22325100) for 25LA-S (71906200) for 40,46LA-S (23325100) for 40,46LA-S SPINNER NUT M5 (20824005) for 15LA-S / "... - Page 32 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. 110100...
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