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 ABOUT YOUR O.S. ENGINE INTRODUCTION 2 ~5 6 BASIC ENGINE PARTS, INSTALLATION 7 ~8 BEFORE STARTING 8 ~10 FACTS ABOUT GLOW PLUGS FUEL CARBURETTOR CONTROLS 10 ~11 SUBSEQUENT READJUSTMENTS 18 CARBURETTOR CLEANLINESS 18 ADJUSTING CHART 19 INSTALLATION OF THROTTLE SERVO 20 CARE AND MAINTENANCE 21 ENGINE EXPLODED VIEW & PARTS LIST 22 ~23 CARBURETTOR EXPLODED VIEW & PARTS LIST 24 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 Note: The MAX-91FX-HGL RING is a highperformance, high-quality engine that has been specifically develpped for radiocontrolled bigger size helicopters. This is ideal for scale models which require more power and torque for heavier weight. This motor is produced by the world's oldest and largest model engines design and manufacturing company, a company that has built more helicopter engines than any other manufacturer worldwide.
INSTALLING THE GLOWPLUG BASIC ENGINE PARTS Install the washer on the glowplug and screw carefully into cylinderhead, making sure that it is not cross-threaded before tightening firmly. Heatsink Head Carburettor Cover Plate Propeller 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. It is essential that the engine mounts in the model are also accurately made and aligned.
CORRECT INSTALLATION OF THE CARBURETOR As delivered, the engine has its carburetor lightly fitted into its intake boss. Secure it as follows. 1. Loosen the retainer nut, rotate the carburetor to its correct position and press it well down into the intake boss, compressing the rubber gasket as shown in the sketch, before re-tightening screw. Side view Front view Top surfaces are in the same plane. INCORRECT 2. Rotate the retainer nut gently until it stops, then tighten a further 90-120 degrees. 0.
2 Glowplug O.S. No.8 glowplug is installed in the engine. 4 Plug wrench Used for tightening glowplug. The O.S. long plug wrench is available as an optional accessory. 3 Glowplug battery The power source for heating the glowplug may be either a large heavy-duty 1.5volt dry cell, or preferably, a 2-volt rechargeable lead-acid cell . 5 Battery leads These are used to conduct current from the battery to the glowplug.
7 Fuel container filter Fit a filter to the outlet tube of your refuelling container to prevent entry of foreign matter into the fuel tank 8 Silicone tubing This is required for the connection between the fuel tank and engine. FACTS ABOUT GLOWPLUGS Fuel Can Filter 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.
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, 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 5% to 30% nitromethane for the 60G carburetor is preferable. The 60H carburetor is designed to use less than 10% nitromethane fuel.
This carburetor is not fitted with a throttle stop screw. Instead, idling speed is adjusted by means of the throttle trim lever on the transmitter. 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.
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. 9. Stopping the engine Fully pull down the throttle trim on the transmitter. Reminder! Never touch, or allow any object to come into contact with, the rotating rotor. In case the engine does not stop. Hold the rotor head, and pinch the silicone tube to stop the fuel supply.
RUNNING-IN ("Breaking-in") SETTING UP, STARTING AND ADJUSTMENT 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.
G Having provisionally set the idle mixture, the next step is to adjust the mixture for hovering flight. NOTE: If throttle response is poor, or the engine stops on restarting, due to a temporarily over-rich mixture, first try pinching the fuel delivery tube for one or two seconds when the engine is restarted, in the expectation that the engine will pick up and run steadily. H Hover the model and actuate the throttle to observe response over the medium speed range.
achieve satisfactory mid-range throttle response, but such readjustments should onIy be made within the range where idling reliability and highspeed performance are not unduly compromised. L Now adjust the Needle Valve to achieve the best performance when the model is flying at full throttle. lf, at full throttle, acceleration is poor, theexhaust 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.
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 Valve11/2 turns from the fully closed position. Make sure that the Mixture Control Valve is at the factory setting.
INSTALLATION OF THROTTLE SERVO After the engine in the helicopter, please observe the following recommendations when linking the throttle servo to the carburetor. Servo output arm Throttle arm Locate the servo so that its output arm and the throttle pushrod are, as closely as possible, directry in line with carburetor's throttle arm, as shown. Throttle control rods A and B should be of equal length.
CARE AND MAINTENANCE Note: Do not inject after-run oil into the carburetor as this may cause the O-rings inside the carburettor to deteriorate. 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. It is also recommended that a good in-line filter be installed between the tank and carburettor.
EXPLODED VIEW C.M3.0X15 1 2 3 22 u 6 4 5 t 7 C.M3.
ENGINE PARTS LIST Description 23 No. Code No. 1 2 9504 200 Heatsink Head 2 2 9503 100 Cylinder Liner 3 2 9503 400 Piston Ring 4 2 9053 200 Piston 5 4 5406 000 Piston Pin 6 2 7917 000 Piston Pin Retainer(2pcs.
60G CARBURETOER PARTS LIST & EXPLODED VIEW C.M3X8 1-1 1 2 4 6 N.+M3X4 7 0 0-3 3-3 5 8 - 9 0-4 0-1 0-2 3-2 3-1 3 ✽ Type of screw C…Cap Screw M…Oval Fillister-Head Screw F…Flat Head Screw N…Round Head Screw S…Set Screw No. Code No. 1 1-1 2 2 7381 410 2 7982 200 Carburetor Rotor 3 3-1 2 7982 300 Mixture Control Valve Assembly 2 7881 810 "O"Ring (L) (2pcs.) 3-2 3-3 2 7881 800 "O"Ring (S) (2pcs.) 2 7881 820 "O"Ring (L) (2pcs.
O.S. GENUINE PARTS & ACCESSORIES ■ O.S. GLOW PLUGS A5 No.
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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 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
