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O.S. Speed 91HZ-R 3D Instruction Manual

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Integrated with O.S. Demand 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.
It is suggested that any instructions supplied with the
model, radio control equipment, etc., are accessible for
checking at the same time.
INSTALLATION OF THROTTLE SERVO
NOTES ON HEATING THE GLOW PLUG
INTRODUCTION, ENGINE PARTS NAME  
GLOWPLUGS, CARBURETOR CONTROLS
CONTENTS
2-5
6-7
8-9
ADJUSTMENT CHART
10
11-12
13-16
ENGINE EXPLODED VIEW & PARTS LIST
CARBURETOR EXPLODED VIEW & PARTS LIST
17-18
19-21
22-24
1
25-28
29
30-34
35
36-37
38-41
42-43
44-45
46
47
48

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Summary of Contents for O.S. Speed 91HZ-R 3D

  • Page 1: Table Of Contents

    Integrated with O.S. Demand 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.

  • Page 2: 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 3 !  NOTES   • • This engine was designed for model After starting the engine, carry out any needle- helicopters. Do not attempt to use it for any valve readjustments after stopping the rotor by other purpose. closing the throttle to the lowest r.p.m.. Stop the engine before attempting to make •...

  • Page 4: Notes On Installing Cooling-Fan Andclutch

    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.

  • Page 5: Notes When Applying An Electric Starter

    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.
  • Page 6 INTRODUCTION This is the O.S. SPEED version of the 91HZ-R Standard accessories developed expressly for the 3D flights. The equipped DRS (Demand Regulator System) Glow Plug No.8...

  • Page 7: Engine Parts Name

    ENGINE PARTS NAME Glowplug Heatsink Head Throttle Lever Idle Mixture Control Screw Carburetor Typr 61G Fuel Inlet High Speed Needle Valve Thermo Insulater Mixture Control Mixture Control Valve Valve Stopper Reguretor Cover Plate Medium Speed Thrust Washer Needle Valve Crankcase Carburetor Rubber Gasket Beam Mount Propeller nut...
  • Page 8 Fuel Fuel Pump Select, by practical tests, the most suitable fuel from among Alternatively, one of the purpose-made the best quality fuels available in your country for helicopter Manual manual or electric fuel pumps may be use. For the best throttle response, a fuel containing 10% to used to transfer fuel directly from your 30% nitromethane is preferable.

  • Page 9: Installation Of The Engine

    INSTALLATION OF THE ENGINE The under-surfaces of all O.S. engine beam CORRECT 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, Side view Front view they will cause stress and distortion within the engine...

  • Page 10: About The Reguretor

    INSTALLATION OF THE CARBURETOR As delivered, the engine has its carburetor lightly Note: In case it is hard to insert the carburetor in fitted into its intake boss. Secure it as follows. the crankcase, apply oil on the Thermo Insulater. Do not force it, or damage to the Thermo Insulater Loosen carburetor retainer screw slightly.

  • Page 11: About The Plumbing

    ABOUT THE PLUMBING Note: Carry out plumbing referring to a sketch on page 21. Since the muffler pressurized fuel feed is not used with this engine, plug a nipple on the muffler or Connect silicone tubing cut into approx. 10cm to the replace it with a bolt.

  • Page 12: Carburetor Controls

    GLOWPLUG Glowplug life Since the glowplug and fuel combination Particularly in the case of very high performance used may have a marked effect on engines, glowplugs must be regarded as expendable performance and reliability, it would be items. However, plug life can be extended and engine worthwhile to experiment with different performance maintained by careful use, i.e.: plug types.

  • Page 13: Starting

    GRADUATIONS ON THE CARBURETOR BODY BASIC POSITION OF MIXTURE CONTROL SCREW As shown in the sketch, the carburetor has (Mixture Control Valve) graduation marks. As delivered, the Mixture Control Screw is Fully opened position positioned at approximately the center as shown in the sketch.
  • Page 14 Medium Speed needle-valve: Opening and closing of the Needle-Valve one turn open from the fully closed position. 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. 3.

  • Page 15: Running-In ("Breaking-In")

    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.

  • Page 16: Adjustment

    ADJUSTMENT Please observe the following before beginning to The general course of adjustment procedure is make any adjustment. shown in the ADJUSTING CHART and is correct for a fuel containing 20% lubricant and 15-30% High-Speed Needle Valve. Turn this approximately nitromethane.
  • Page 17 After about 10 seconds of idling, open the throttle to Having provisionally set the idle mixture, the next 'float' the model. lf the transition is smooth, the idle step is to adjust the mixture for hovering flight. mixture is O.K. If the symptoms of either rich or Iean Hover the model and actuate the throttle to observe running are observed, readjust the Idle Mixture response over the medium speed range.

  • Page 18: Subsequent Readjustments

    CARBURETOR CLEANLINESS SUBSEQUENT READJUSTMENTS The correct functioning of the carburetor depends on Once the engine has been run-in and the carburetor its small fuel orifices remaining clear. The minute controls properly set up, it should be unnecessary to particles of foreign matter that are present in any fuel alter the mixture settings, except to make minor can easily partially obstruct these orifices and upset changes to the Main (High-Speed) Needle Valve...

  • Page 19: Care And Maintenance

    CARE AND MAINTENANCE Please pay attention to the matters Install an in-line fuel filter between the tank described below to ensure that your engine and carburetor to prevent foreign matter in serves you well in regard to performance, the tank from entering the carburetor. reliability and long life.

  • Page 20: Trouble Shooting

    TROUBLE SHOOTING Symptom Engine fails to fire. Corrective action Cause Fuel tank is empty. Fill the tank with fuel and repeat. Fuel not reaching the engine. Priming procedure. Glowplug element is burnt out. Replace glowplug. Glowplug battery discharged Recharge or replace the battery. Clogged fuel filter.
  • Page 21 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 Set the needle only after warming up.

  • Page 23: Carburetor Exploded View

    CARBURETOR EXPLODED VIEW C.M3x8 C.M2.6x7 10-1 C.M2x5 11-4 11-2 11-3 11-1 Type of screw C...Cap Screw CARBURETOR PARTS LIST Description Description Code No. Code No. Throttle Lever Assembly Needle Valve Assembly (Main Needle) 29085140 29088900 Retaining Screw (10pcs.) Needle Assembly 79871110 29085910 Carburetor Rotor...

  • Page 24: O.s. Genuine Parts & Accessories

    O.S. GENUINE PARTS & ACCESSORIES GLOWPLUG POWERBOOST PIPE 90 CRANKSHAFT CLAMP No.7 Exhaust Tube Silencer Retaining Screw (71530510) (2pcs.) (72145010) (71607100) (29122520) No.8 Exhaust Gasket Set Pressure Nipple M4 (71608001) (2pcs.) (72145020) (72145030) No.10 (Former A5) (71605100) LONG SOCKET WRENCH LOCK WASHER NON-BUBBLE SUPER FILTER...

  • Page 25: Memo

    MEMO 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722   Copyright 2011 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 60092520 031100...

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