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.
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 • After starting the engine, carry out any needle- This engine was 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, fol- lowing the manufacturers' recommendations, using appropriate screws and locknuts. • Use an electric starter.
Notes on installing cooling fan and clutch Do not use a tool which locks piston when installing a cooling-fan and clutch, or top of the piston may be damaged. Also, do not insert a screw driver or the similar into the exhaust port. It is recommended to use Crankshaft Clamp 3246 (Code No.71530400) available as an optional tool. 6 Notes on installing cooling fan and clutch Do not grip the engine mounting beams with a vise, or the crankcase will be distorted which will result in engine breaking.
NOTES WHEN APPLYING AN ELECTRIC STARTER Because of this 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. Do not over-prime. This could cause a hydraulic lock and damage the engine on application of the electric starter. If over-primed, remove glowplug, close needle-valve and apply starter to pump out surplus fuel.
Note on heating the glow plug Example The heatsink head on the engine is treated with Alumite which does not conduct current. Therefore, when heating a glow plug, connect one lead to the glow plug and the other to the head of cover plate retaining screw. 10 INTRODUCTION This is the increased power version of the 50SX-H RING whis is developed expressly for F3C M class helicopter competition utilizing 0.50 cubic inch engines. STANDARD ACCESSOIES Glow Plug No.
ENGINE PARTS NAME Glowplug Heatsink Head Throttle Lever Mixture Control Screw Carburetor Typr 60LH Mixture Control Valve Fuel Inlet (No.1) Needle Valve Cover Plate Mixture Control Valve Stopper Caburetor Rubber Gasket Beam Mount Caburetor Sealing Washer Crankcase Propeller nut Crankshaft 12 BEFORE STARTING Tools, accessories, etc.The following items are necessary for operating the engine. In case of 1.5volt dry cell Battery leads Items necessary for starting Glow Plug O.S. No.
Fuel Pump Fuel 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. 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.
INSTALLATION OF THE ENGINE CORRECT 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. If they are not, they will cause stress and distortion within the engine itself, probably resulting in loss of performance and internal damage.
GLOWPLUG Glowplug life Since the glowplug and fuel combination used may have a marked effect on performance and reliability, it would be worthwhile to experiment with different plug types. Recommended O.S. plugs are No.8, No.7 and No.10 (Former A5) . Carefully install plug finger-tight, before final tightening with the correct size plug wrench. Particularly in the case of very high performance engines, glowplugs must be regarded as expendable items.
GRADUATIONS ON THE CARBURETOR BODY BASIC POSITION OF MIXTURE CONTROL SCREW (Mixture Control Valve) As shown in the sketch, the carburetor has graduation marks. As delivered, the Mixture Control Screw is positioned at approximately the center as shown in the sketch. Mixture gets lean when the Mixture Control Screw is turned right, while mixture gets rich when the Mixture Control Screw is turned left.
1. Opening and closing of the Needle-Valve 3. Preparation of the starter Turn the needle clockwise to close the needlevalve, and turn the needle counter-clockwise to open the needle-valve as shown in the sketch. Install the starting shaft to the starter securely. Poor installation will allow the shaft to swing which can be dangerous. 4. Checking the rotating direction of the starter Close Make sure that the starter rotates in the direction shown in the sketch.
In case the engine does not stop. Hold the rotor head, and pinch the fuel line to stop the fuel supply. If it still does not stop, pull off the fuel line from the carburetor. It is necessary to readjust the throttle linkage so that the carburetor rotor is fully closed when the throttle stick and throttle trim on the transmitter are fully pulled Down.
ADJUSTMENT The following adjustments are approximately correct when using a fuel containing 18-25% lubricant and 10-30% nitromethane. Bear in mind that fuels containing relatively large percentages of power-boosting nitromethane operate at richer mixture settings than are needed for mild fuels and will, therefore, require the Needle Valve to be readjusted accordingly. The type and percentage of lubricant used is also a factor here, as noted later in these instructions.
K After about 10 seconds of idling, open the throttle to 'float' the model. lf the transition is smooth, the idle mixture is O.K. If the symptoms of either rich or Iean running are observed, readjust the Mixture Control Screw accordingly. M Now re-check hovering performance and, if necessary, fine-tune the mixture for hovering flight. N For helicopters, good throttle response at medium r.p.m. (e.g.hovering speeds) is most important, since this is a power range widely used in helicopter flight.
CARBURETOR CLEANLINESS SUBSEQUENT READJUSTMENTS The correct functioning of the carburetor depends on its small fuel orifices remaining clear. The minute particles of foreign matter that are present in any fuel can easily partially obstruct these orifices and upset mixture strength so that engine performance becomes erratic and unreliable.
CARE AND MAINTENANCE Please pay attention to the matters described below to ensure that your engine serves you well in regard to performance, reliability and long life. Install an in-line fuel filter between the tank and carburetor to prevent foreign matter in the tank from entering the carburetor. Clean these filters periodically.
TROUBLE SHOOTING Symptom Engine fails to fire. Corrective action Cause Fuel tank is empty. Fuel not reaching the engine. Fill the tank with fuel and repeat. Priming procedure. Glowplug element is burnt out. Glowplug battery discharged Replace glowplug. Recharge or replace the battery. Clogged fuel filter. Silencer inside is dirty. Clean or replace fuel filter. Clean inside silencer. Over priming Remove glowplug and pump out excess fuel. Fuel tubing is disconnected.
Symptom Unstable idle Corrective action Cause Unsuitable glowplug Use suggested glowplug in the instructions. Unsuitable fuel Do not use extremely high nitro or low oil fuel. Silencer is disconnected or is loose Install silencer securely. Symptom Not reaching expected peak r.p.m. Corrective action Cause Insufficient warming up or running-in. Set the needle only after warming up. Complete running-in. Silencer or manifold is not securely connected or disconnected.
39 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Description Hyper Head Cylinder Liner Piston Ring Piston Piston Pin Piston Pin Retainer (2pcs.) Connecting Rod Carburetor Complete (Type 60LH) Propeller Nut Thrust Washer Crankshaft Bearing (Front) Carburetor Retainer Assembly Crankcase Crankshaft Bearing (Rear) Crankshaft Gasket Set Cover Plate Screw Set Glow Plug No.8 The specifications are subject to alteration for improvement without notice. Code No.
CARBURETOR EXPLODED VIEW C.M3X8 1-1 4 2 1 6 9 9-3 3-3 5 9-4 7 9-1 9-2 10 3-2 11 8 3-1 3 Type of screw C...Cap Screw 40 CARBURETOR PARTS LIST No. Code No.
O.S. GENUINE PARTS & ACCESSORIES POWER BOOST Pipe 55 GLOWPLUG (72144000) M3x35 Cap Screw (2pcs.) Spring Washer (2pcs.) Nipple (1pc) No.7 (71607100) No.8 (71608001) EXHAUST GASKET SET 55HZ (3pcs.) No.
MEMO 44 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 2009 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
