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.
15CV-A, 25FX, 32SX
MAX-
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Table of Contents
Related Manuals for O.S. engine MAX-32SX
Summary of Contents for O.S. engine MAX-32SX
- Page 1 15CV-A, 25FX, 32SX MAX- 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 RUNNING-IN (Breaking-in) WARNINGS ABOUT YOUR O.S. ENGINE IDLING ADJUSTMENT CHART INTRODUCTION, BEFORE INSTALLING THE ENGINE MIXTURE CONTROL VALVE ADJUSTMENT, REALIGNMENT OF MIXTURE CONTROL VALVE BASIC ENGINE PARTS CARBURETOR PARTS SUBSEQUENT STARTING PROCEDURE SUBSEQUENT READJUSTMENT INSTALLATION OF THE ENGINE CARBURETOR CLEANLINESS, THROTTLE LINKAGE, SILENCER ENGINE CARE AND MAINTENANCE... -
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
BEFORE INSTALLING THE ENGINE INTRODUCTION Installing the glowplug This range of engines is ideally suited to a variety • Carefully insert plug, with of R/C aircraft, including trainer, sports, aerobatic washer, fingertight only, before and scale types. final tightening with the correct A separate precision-made needle-valve unit is •... -
Page 9: Basic Engine Parts
INSTALLATION OF THE CARBURETTOR BASIC ENGINE PARTS For 15CV-A Glowplug Cylinder head Loosen the retainer screw, rotate the carburettor to its correct position and make Throttle Stop Fuel inlet sure that it is pressed well down into the Screw intake boss, compressing the rubber gasket, Carburetor before retightening screw. -
Page 10: Installation Of The Engine
Make sure that the mounting beams are parallel and INSTALLATION OF THE ENGINE that their top surfaces are in the same plane. Installation in the model CORRECT INCORRECT O.S. radial motor mount A typical method of beam (Available as an optional extra mounting is shown below, left. -
Page 11: Throttle Linkage, Silencer 10
SILENCER THROTTLE LINKAGE The exhaust outlet of the silencer can be rotated to • Before connecting the throttle-lever / servo linkage, any desired position in the following manner: make sure that no part of the linkage interferes with the internal structure of the aircraft or wiring, etc., Assembly screw when the throttle is fully open or fully closed. -
Page 12: Fuel Tank Location
Reminder! Suggested Fuel Tank Capacities Model engines generate considerable heat. approx 100cc 15CV-A Do not touch any part of your engine until approx 200cc 25FX it has cooled. approx 220cc 32SX Contact with the muffler (silencer), cylinder head or exhaust header pipe, in particular, may result in a serious burn. -
Page 13: Glowplug
Glowplug life GLOWPLUG Particularly in the case of very high performance Since the glowplug and fuel combination used may engines, glowplugs must be regarded as expendable have a marked effect on performance and reliability, it However, plug life can be extended and engine would be worthwhile to experiment with different plug performance maintained by careful use, i.e.: types. -
Page 14: Fuel, Propellers 13
Reminder! FUEL Model engine fuel is poisonous. Do not allow it to come into contact with Select, by practical tests, the most suitable fuel from the eyes or mouth. Always store it in a among the best quality fuels available in your country clearly marked container and out of for model use. -
Page 15: Mixture Controls
• Sport Aerobatic The Mixture Control Valve (carburetor) This meters fuel flow at part-throttle and idling 15CV-A 6,8 4 6,9 4 speeds to ensure reliable operation as the throttle 25FX 6,9.5 5,10 5 9 6,9.5 5 is opened and closed. The Mixture Control Valve is 32SX 10 6,10.5 5,11 6 8,10 6... - Page 16 4 Glowplug battery 5 Battery leads Battery leads The power source for heating the glowplug may be These are used to conduct current either a large heavy-duty 1.5volt dry cell, or preferably, from the battery to the glowplug. a 2-volt rechargeable lead-acid cell (accumulator). Basically, two leads, with clips, are required, but, for greater conve- If a 2-volt cell is employed,...
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Page 17: Starting 16
9 Fuel can filter Fill the fuel tank. Do not allow fuel to overflow into Fuel Can Filter Fit a filter to the outlet tube of your the silencer, otherwise the engine may become refuelling container to prevent entry flooded and difficult to start. of foreign matter into the fuel tank. -
Page 18: Running-In (Breaking-In) 17
6. Connect battery leads to glowplug. RUNNING-IN ("Breaking-in") Bring electric starter into contact with spinner-nut or spinner and depress starter switch for one or All internal-combustion engines benefit from extra two seconds. Repeat if necessary. care when they are run for the first few timesknown When the engine starts, withdraw the starter im- as running-in or breaking-in. - Page 19 Optimum needle setting(1) Now close the needle-valve until the engine Slowly advance the throttle to its fully open position, speeds up to "two-cycle"operation and allow it to then gradually close the needle-valve until the run for about 10 seconds, then reopen the needle- exhaust note begins to change.
- Page 20 Needle-valve adjustment diagram Note : Practical best(optimum) needle-valve setting This diagram is for reference Clear, high-pitched two-stroke purposes only. exhaust note Maximum rpm Actual needle positions may setting("Lean"). Intermittent, high-pitched differ from those shown. two-stroke note superimposed To stop the engine, close the STARTING •...
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Page 21: Idling Adjustment Chart
IDLING ADJUSTMENT CHART Start the engine. Disconnect the battery leads at mid speed. 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. -
Page 22: Mixture Control Valve Adjustment
Note: Mixture Control Valve adjustments should MIXTURE CONTROL VALVE ADJUSTMENT be made in steps of 15-30˚ initially, carefully checking the effect, on throttle With the engine running, close the throttle and allow it response, of each small adjustment. to idle for about five seconds, then open the throttle fully. -
Page 23: Subsequent Starting Procedure
SUBSEQUENT STARTING PROCEDURE SUBSEQUENT READJUSTMENT Once the optimum needle-valve setting has been es- Once the engine has been run-in and the controls tablished (see page 19, Needle-valve adjustment dia- properly set up, it should be unnecessary to alter the gram) the procedure for starting may be simplified as mixture settings;... -
Page 24: Carburetor Cleanliness
CARBURETOR CLEANLINESS ENGINE CARE AND MAINTENANCE The correct functioning of the carburetor depends on At the end of each operating session, drain out any its small fuel orifices remaining clear. The minute fuel that may remain in the fuel tank. particles of foreign matter that are present in any fuel, Next, energize the glowplug and try to restart the can easily partially obstruct these orifices and upset... -
Page 25: Genuine O.s. Parts & Accessories 24
O.S. GENUINE PARTS & ACCESSORIES SPINNER NUT LONG PROPELLER NUT SETS O.S. GLOW PLUGS No.8 (71605100) (71608001) Type of Engine Code No. Size Code No. Size Type of Engine 15CV-A 20824005 25FX. 32SX 20. 25. RE 73101000 1/4"-28 23024008 1/4"-28 (71605300) 1/4"-28 ( L ) 25FX. - Page 26 SUPER SILENCERS SUPER FI LTER LOCK WASHER (10Sets) (72403050) Code No. Type of Engine Size 55500002 25FX.32SX Type of Engine Code No. Size 23325030 E-3030S 32SX NON-BUBBLE WEIGHT LONG SOCKET WRENCH WITH PLUG GRIP (71531000) (71521000)
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Page 27: Engine Exploded Views & Engine Parts Lists 26
EXPLODED VIEW (15CV-A) C . M 2 . 6 x 1 2 M . M 2 . 6 x 8 S . 3 x 3 Type of screw C Cap Screw F Flat Head Screw N Round Head Screw S Set Screw... -
Page 28: Parts Lists
ENGINEN PARTS LIST (15CV-A) Code No. Description 2 1504 010 Cylinder Head 2 1503 010 Cylinder & Piston Assembly 2 1706 000 Piston Pin 2 1205 040 Connecting Rod 2 1581 000 Carburetor ( Type 10K) 2 1481 700 Carburetor Retainer 2 0810 007 Propeller Nut 2 1109 005... - Page 29 EXPLODED VIEW (25FX,32SX) C.M2.6X12 5 -1 C.M2.6X7 5 -2 S.M3X3 N.+M3.5X5 e -2 e -7 e -1 e -5 e -4 e -6 e -3 Type of screw C Cap Screw F Flat Head Screw N Round Head Screw S Set Screw...
- Page 30 ENGINEN PARTS LIST (25FX,32SX) Code No. Description 25FX 32SX Cylinder Head 22604020 23404100 Cylinder & Piston Assembly 22603040 23403000 Piston Pin 22606009 23406000 Connecting Rod 22805010 23405000 Carburetor ( Type 20D ) 22681030 Carburetor ( Type 20F ) 23482000 Carburetor Rubber Gasket 22615000 22615000 Carburetor Retaining Screw (2pcs.)
- Page 31 CARBURETOR 10K (15CV-A) CARBURETOR 20D (25FX) 1 -1 N.+M3.5X5 Type of screw C Cap Screw F Flat Head Screw N Round Head Screw S Set Screw Description Code No. Code No. Description 22681430 Throttle Lever Assembly 2 2681 430 Throttle Lever Assembly 22681419 Throttle Lever 2 1284 200...
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Page 32: Engine Three View Drawing 31
THREE VIEW DRAWING CARBURETOR 20F (32SX) 15CV-A MAX - SPECIFICATIONS 2.49 cc ( 0.152 cu.in. ) Displacement 15.2mm ( 0.598 in. ) Bore 13.7mm ( 0.539 in. ) Stroke Practical R.P.M. 2,500 19,000 r.p.m. Power output 0.5 bhp / 18,000 r.p.m. 170g (5 .99 oz. -
Page 33: Specifications
THREE VIEW DRAWING 25FX MAX - 32SX MAX - SPECIFICATIONS SPECIFICATIONS 5.23 cc ( 0.319 cu.in. ) Displacement 4.07 cc ( 0.2485 cu.in. ) Displacement 19.5mm ( 0.768 in. ) Bore 18.0mm ( 0.7087 in. ) Bore 17.5mm ( 0.689 in. ) Stroke 16.0mm ( 0.630 in. - Page 34 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...