It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' section on pages 2-5 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.
CONTENTS SAFETY INSTRUCTIONS AND WARNINGS 2~5 ABOUT YOUR O.S.
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.
WARNINGS • Never touch, or allow any • Never operate your engine in an en- object to come into contact with, the rotating parts. closed space. Model engines, like automobile engines, exhaust deadly carbonmonoxide. Run your engine only in an open area. • Model engine fuel is poisonous. Do not allow it to come into contact with the eyes or mouth. Always store it in a clearly marked container and out of the reach of children. • Model engines generate considerable heat.
NOTES • • After starting the engine, carry out any needle- These engine were designed for model helicopters. Do not attempt to use it for any other purpose. valve readjustments after stopping the rotor by closing the throttle to the lowest r.p.m.. Stop the engine before attempting to make other adjustments to the carburetor. • Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts. • Use an electric starter.
NOTES • Take care that loose clothing (ties, shirt sleeves, scarves etc.) do not come into contact with the rotor. Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt pocket from where they could fall through the rotor disc. • For their safety, keep all onlookers (especially small children) well back (at least 20 feet or 6 metres) 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.
INTRODUCTION BASIC ENGINE PARTS The MAX-46FX-H RING is a highperformance engine that has been developed expressly for "medium-sized" radio-controlled helicopters. Heatsink Head Glowplug Carburettor Typr 40E Note: Because of initial tightness, a standard electric starter may have difficulty in rotating the engine when cold, before it has been adequately run-in. In this case, use a high-torque type starter.
INSTALLING THE GLOWPLUG Install the washer on the glowplug and screw carefully into cylinderhead, making sure that it is not cross-threaded before tightening firmly. CORRECT Side view Front view Top surfaces are in the same plane. INCORRECT Glow plug Washer INSTALLATION OF THE ENGINE The under-surfaces of all O.S. engine beam mounting lugs are precision machined flat and exactyly parallel to the engine's horizontal axis.
BEFORE STARTING INSTALLATION OF COOLING FAN Tools, accessories, etc. The following items are necessary for operating the engine. As supplied the MAX-46FX-H is equipped with a conventional drive hub, keyed to flats on each side of the crankshaft. However, some helicopters require this to be replaced by a taper collet for cooling fan installation. Fit this as follows. Rotate crankshaft to TDC. Remove drive hub and thrust washer. Slide taper collet onto 3/8-in. dia. front journal with its slot uppermost-i.
Warning (Very hot) Never touch the nichrome wire while the battery is connected. 6 Fuel bottle or pump For filling the fuel tank, a simple, polyethylene "squeeze" bottle, with a suitable spout,is all that is required. Alternatively, one of the purpose-made manual or electric fuel pumps may be used to transfer fuel directly from your fuel container to the fuel tank. to ge ss. e olta er v ightn Low uce br red e Raisage to volt ease .
9 Hexagon starting shaft This shaft mounted on an electric starting motor is driven into the main body of a helicopter to turn the engine. FACTS ABOUT GLOWPLUGS Since the compatibility of glowplug and fuel may have a marked effect on performance and reliability, it may be worthwhile to choose the R/C type plug found most suitable after tests. Recommended O.S. plugs are No.8, A5 and A3. Carefully install plug finger-tight, before final tightening with the correct size plug wrench.
However, plug life can be extended and engine performance maintained by careful use, i.e.: • Install a plug suitable for the engine. • Use fuel containing a moderate percentage FUEL Select, by practical tests, the most suitable fuel from among the best quality fuels available in your country for helicopter use. For the best throttle response, a fuel containing 10% to 30% nitromethane is preferable. Lubricants may be either castor-oil or a suitable synthetic oil (or .
Mixture Control Valve (MIxture Control Screw) CARBURETOR CONTROLS With a fixed-wing model, power failure is rarely a serious threat to the safety of the aircraft since it can usually glide down to a safe landing. In a helicopter, on the other hand, it is vitally imporant that the engine keeps running and that there is a quick and reliable response to the throttle in order to ensure safe ascent and descent of the model.
4. Checking the rotating direction of the starter Make sure that the starter rotates to the direction shown in the sketch. If the direction is reverse, reverse the leads on battery. STARTING Be sure to use a muffler pressurized fuel feed. Use the same fuel as you intend to employ for actual operation of your model. 1. Opening and closing of the Needle-Valve Turn the needle clockwise to close the needle-valve, and turn the needle counter-clockwise to open the needle-valve as shown in the sketch. 5.
8. Starting Connect the battery to the glowplug and start the engine by applying the starter. When started, switch off the starter and withdraw the starting shaft after making sure the rotation of the starter shaft stops. RUNNING-IN ("Breaking-in") All internal-combustion engines benefit, to some degree, from extra care when they are run for the first few times known as running-in or breaking-in. This is allows the working parts to mate together under load at operating temperature. However, because O.S.
Set up the throttle linkage as follows: With the transmitter throttle trim lever fully retarded, adjust the throttle servo linkage so that the throttle rotor is (a) fully open when the transmitter throttle stick is fully advanced and (b) fully closed (i.e. engine stopped) when the stick is fully retarded.The idling speed is then set by advancing the throttle trim lever to the point where the engine runs, steadily and reliably,at the desired idling speed.
D lf, at this time, the engine is slow to pick up and produces an excess of exhaust smoke, the mixture is too rich. Correct this condition by turning the Mixture Control Screw clockwise. lf the mixture is extremely rich, engine rpm will become unstable : opening the throttle will produce a great deal of smoke and rpm may drop suddenly or the engine may stop. This condition may also be initiated by an excessively prolonged warming-up period.
exhaust unduly smoky and the model fails to reach expected straight line speed, the mixture is too rich and the Needle Valve setting will need to be reduced. lf, however, after smoothly acceIerating to satisfactory high-speed straight and level flight, power is lost when the model is puIled up into a climb, the mixture is too lean. ln this case, land the model immediately and readjust Needle Valve to a richer setting.
SUBSEQUENT READJUSTMENTS CARBURETOR CLEANLINESS Once the engine has been run-in and the carburetor controls properly set up, it should be unnecessary to alter the mixture settings, except to make minor adjustments to the Needle Valve occasionally, to take account of variations in climatic condisitions.
ADJUSTING CHART A Open the Needle Valve 2 turns from the fully closed position. Make sure that the Mixture Control Valve is at the factory setting.
INSTALLATION OF THROTTLE SERVO After fitting the engine in the helicopter, please observe the following recommendations when linking the throttle servo to the carburetor. CORRECT-Throttle lever movement should be disposed symmetrically,as shown. Locate the servo so that its output arm and the throttle pushrod are, as closely as possible, directry in line with carburettor's throttle arm, as ˚ 90 shown.
CARE AND MAINTENANCE 1. The minute particles of foreign matter, that are 4. Finally, inject some after-run oil into the engine. present in any fuel may, by accumulating and partially obstructing fuel flow, cause engine performance to become erratic and unreliable. O.S. 'Super-Filters' (large and small)are available, as optional extras, to deal with this problem. One of these filters, fitted to the outlet tube inside your refueling container, will prevent the entry of foreign material into the fuel tank.
MAX-46FX-HRING EXPLODED VIEW C.M3X12 1 2 y 3 6 22 4 r 5 7 8 w N.+M3.5X6 C.
ENGINE PARTS LIST 23 No. Code No.
MAX-46FX-HRING (G) / HG (L/S)RING EXPLODED VIEW C.M3X12 1 2 y 3 6 4 24 r 5 7 8 w N.+M3.5X6 C.
ENGINE PARTS LIST 25 No. Code No.
CARBURETOER PARTS LIST & EXPLODED VIEW 1-1 3 1 2 3-1 5 6 4 7 7-4 N.+M3.5X6 7-5 7-2 7-1 7-3 8 No. Code No. Description 1 1-1 2 3 3-1 4 5 6 7 7-1 7-2 7-3 7-4 7-5 8 9 22781410 22781420 25683200 25683100 24881824 26781506 45581820 22681953 27881900 24981959 24981837 26381501 27381940 26711305 46215000 25081700 Throttle Lever Assembly Throttle Lever Retaining Screw Carburetor Rotor Carburetor Body "O" Ring (2pcs.
MAX-46FX-HRING THREE VIEW DRAWING 17.5 SPECIFICATIONS 44 7.45 cc (0.455 cu.in.) 22.0mm (0.866 in.) 19.6mm (0.772 in.) 2,000~17,000 r.p.m. 1.62 bhp / 16,000 r.p.m. 385g(13.6oz.) 37 27 7.5 2-φ3.2 88 UNF1/4-28 36.3 Displacement Bore Stroke Practical R.P.M. Power output Weight 70 ■ ■ ■ ■ ■ ■ 4-φ3.7 18.5 18.5 MADE IN JAPAN 35 60.5 19.
O.S. GENUINE PARTS & ACCESSORIES ■ O.S. GLOW PLUGS ■ TAPER COLLET ■ 873 SILENCER (25608100) (25425000) No.
Q U A L IT Y PRECISION & P ERFO RM AN NC E UN ES LED CE UAL EQ T AB L IS H IN G T H E STA N D A R D S O F EXCE LLE 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 C Copyright 2001 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
