Integrated with O.S. fuel regulator system. 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 the initial tightness, of the piston/sleeve assembly 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 an anodized finish which does not conduct current. Therefore, when heating the glow plug, connect one lead to the glow plug and the other to the head or cover plate retaining screw. 10 INTRODUCTION The MAX-55HZ-R has been developed based on the 55HZ designed expressly for 50 size helicopter models, and equipped with the new O.S. regulator system.
ENGINE PARTS NAME Glowplug Heatsink Head Throttle Lever Idle Mixture Control Screw Carburetor Typr 40L-R Fuel Inlet High Speed Needle Valve Mixture Control Valve Cover Plate Thrust Washer Crankcase Beam Mount Reguretor Mixture Control Valve Stopper Medium Speed Needle Valve Carburetor Rubber Gasket Propeller nut Crankshaft 12 BEFORE STARTING Tools, accessories, etc.The following items are necessary for operating the engine. In case of 1.
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. Lubricants may be either castor-oil or a suitable synthetic oil (or .
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. If they are not, they will cause stress and distortion within the engine itself, probably resulting in loss of performance and internal damage.
Note: In case it is hard to insert the carburetor in the crankcase. Do not force it, or damage to the crankcase can occur. 3. Rotate the retainer screw gently until it stops, then tighten a further 90-120 degrees. Do not over-tighten the screw as this will damage the Carburetor Body. Carburetor Rubber Gasket Retainer screw 0.
ABOUT THE REGURETOR CARE OF REGURETOR ALWAYS use fuel filters. Keep the fuel tank scrupulously clean and filter all fuel as it enters the tank (e.g.via an O.S.'SuperFilter' Code No.72403050) and use a good quality in-line filter between the tank and regulator. Remember to inspect filter screens at regular intervals and rinse clean as necessary. NEVER disassemble the pressure regulator. The original performance may not be restored after reassembly.
Fuel Stopper (commercially available) Remove when refuelling Check valve Grooved part should face the fuel tank. T Nipple (commercially available) JAPAN Check valve Be aware of direction Fuel tank Silicone tubing (commercially approx.10cm available) Fuel Stopper (commercially available) Fuel Filter (commercially available) 22 CARBURETOR CONTROLS C The Medium Speed Needle Valve This is an extra control that can be brought into play, if necessary, after adjusting A and B above.
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.
Medium Speed needle-valve: one turn open from the fully closed position. 1. Opening and closing of the Needle-Valve Turn the needle clockwise to close the needlevalve, and turn the needle counter-clockwise to open the needle-valve as shown in the sketch. 3. Preparation of the starter Install the starting shaft to the starter securely. Improper installation will allow the shaft to swing creating a dangerous situation.
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 Please observe the following before beginning to make any adjustment. The general course of adjustment procedure is shown in the ADJUSTING CHART and is correct for a fuel containing 20% lubricant and 15-30% nitromethane. High-Speed Needle Valve. Turn this approximately 30 degrees (3 to 4 clicks) at a time, when making initial adjustments; then in steps of approximately 15 degrees (1 to 2 clicks) when making final adjustments.
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 Idle Mixture Control Screw accordingly. Maximum 2. Having provisionally set the idle mixture, the next step is to adjust the mixture for hovering flight. Hover the model and actuate the throttle to observe response over the medium speed range.
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.
43 25804010 25804160 25803100 27703400 25803200 25806000 25217000 25205000 25881010 23210007 46120000 26731002 25881700 45566310 25801000 25830000 25802000 25804170 25807010 22681953 25613000 71608001 72403070 Description Heatsink Head Head Gasket Cylinder Liner Piston Ring Piston Piston Pin Piston Pin Retainer (2pcs.
CARBURETOR EXPLODED VIEW C.M3x8 1-1 3 C.M2.6x7 11 5 1 11-1 2 6 4-3 7 14 9-1 4-2 4-1 13-1 12-1 13 12 10 Size 79871020 M2.6x7 4 C...Cap Screw 9 CAP SCREW SETS (10pcs./sets) Code No. Type of screw 10-1 10-2 C.M2x5 8 Pcs. used in an engine Rotor Guide Washer Retaining Screw (1pc.) 44 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 48 URL : http://www.os-engines.co.jp C Copyright 2010 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX.
