O.S. engine MAX-91SZ-Hring Owner's Instruction Manual
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O.S. engine MAX-91SZ-Hring Owner's Instruction Manual

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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.
NOTES ON HEATING THE GLOW PLUG
INTRODUCTION, BEFORE STARTING
STARTING, RUNNING-IN ("Breaking-in")
CONTENTS
2-5
ADJUSTMENT CHART
6
7-8
9-12
CARBURETOR EXPLODED VIEW & PARTS LIST
13-15
16-17
18-19
20-22
1
22-26
27
28
29
30-33
34-35
36-37
38
39
40

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Summary of Contents for O.S. engine MAX-91SZ-Hring

  • Page 1: Table Of Contents

    CONTENTS ADJUSTMENT 22-26 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE ADJUSTMENT CHART NOTES ON INSTALLING, COOLING-FAN AND CLUTCH INSTALLATION OF THROTTLE SERVO NOTES WHEN APPLYING AN ELECTRIC STARTER,...

  • Page 2: Safety Instructions And Warnings About Your O.s. Engine

    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.
  • Page 3 NOTES • • These engine were 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 And Clutch

    Notes on installing cooling fan and clutch Application is as follows: Do not use a tool which Remove the crankcase rear cover plate from the locks piston when engine and rotate the crankshaft to the bottom installing a cooling-fan dead center (BDC) position. and clutch, or top of Insert the crankshaft clamp so that its grooved portion surrounds the crankpin and lower end of...
  • Page 5 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.
  • Page 6 BEFORE STARTING In case of 1.5volt dry cell Tools, accessories, etc.The following items are necessary for operating the engine. Battery leads Items necessary for starting Glow Plug O.S. No.8 is supplied with the engine. Battery leads These are used to conduct current from the battery to the glowplug.

  • Page 7: Engine Parts Name, Installation

    TOOLS Hex Wrench Long Socket Wrench With Plug Grip Necessary for engine installation. Recommended for easy removal and replacement of 1.5mm, 2mm, 2.5mm, 3mm the angled and recessed glowplug, the O.S.Long Socket Wrench incorporates a special grip. Phillips Screwdriver No.1, No.2, etc. Screwdriver End Wrenches Necessary for carburetor adjustments.

  • Page 8: Of The Standard Accessories

    INSTALLATION OF THE STANDARD ACCESSORIES Insert the carburetor rubber INSTALLATION OF THE CARBURETOR gasket on the carburetor Insert the carburetor retainer as illustrated. body securely. Unscrew the retainer screw a little. Then, insert the carburetor JAPAN in the crankcase. Carburetor Rubber Gasket Carburetor Retainer Note: In case it is hard to insert the carburetor in...

  • Page 9: Installation Of The Engine

    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,...

  • Page 10: Carburetor Controls

    The Medium Speed Needle Valve CARBURETOR CONTROLS This is an extra control that can be brought into With a fixed-wing model, power failure is rarely a play, if necessary, after adjusting A and B above. It serious threat to the safety of the aircraft since it can provides the means of fine-tuning mixture strength usually glide down to a safe landing.
  • Page 11 STARTING 3. Preparation of the starter Be sure to use a muffler pressurized fuel feed. Use Install the starting shaft to the the same fuel as you intend to employ for actual starter securely. operation of your model. Improper installation will allow the Opening and closing of the Needle-Valve shaft swing...

  • Page 12: Adjustment

    ADJUSTMENT RUNNING-IN ("Breaking-in") All internal-combustion engines benefit, to some Please observe the following before beginning to make any adjustment. degree, from extra care when they are run for the first few times known as running-in or breaking-in. ー High-Speed Needle Valve. Turn this approximately This is allows the working parts to mate together 30 degrees (3 to 4 click) at a time, when making under load at operating temperature.
  • Page 13 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 running are observed, readjust the Idle Mixture observe response over the medium speed range.
  • Page 14 SUBSEQUENT READJUSTMENTS CARBURETOR CLEANLINESS Once the engine has been run-in and the The correct functioning of the carburetor depends carburetor controls properly set up, it should be on its small fuel orifices remaining clear. unnecessary to alter the mixture settings, except to The minute particles of foreign matter that are make minor changes to the Main (High-Speed) present in any fuel can easily partially obstruct...
  • Page 15 ADJUSTING CHART High Speed Needle Valve - 2 turns opened from fully closed position. Medium Speed Needle Valve - 2 turns opened from fully closed position. Start the engine Warm up the engine Observe the mixture condition while "floating" the model Lean mixture Rich mixture Turn the Idle Mixture...

  • Page 16: Installation Of Throttle Servo

    INSTALLATION OF THROTTLE SERVO After the engine is installed 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 control rod A and B should be equal length.

  • Page 17: Trouble Shooting

    Symptom TROUBLE SHOOTING 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. Clean or replace fuel filter.
  • Page 18 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. Install silencer securely. Silencer is disconnected or has play Symptom Not reaching expected peak r.p.m. Corrective action Cause Set the needle only after warming up.

  • Page 19: Engine Exploded View & Parts List

    ENGINE EXPLODED VIEW ENGINE PARTS LIST C.M3x15 Description Code No. 29064000 Heatsink Head 29063100 Cylinder Liner 29503400 Piston Ring 29063200 Piston 27006000 Piston Pin 27917000 Piston Pin Retainer (2pcs.) 29505010 Connecting Rod 29183000 Carburetor Complete 60M-C 45010002 Propeller Nut 46120000 Thrust Washer 26731002 Crankshaft Ball Bearing (Front)
  • Page 20 CARBURETOR EXPLODED VIEW C.M3x8 Type of screw C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw CARBURETOR PARTS LIST Description Code No. Description Code No. 27381410 27981900 Throttle Lever Assembly Needle Valve Assembly 22826131 27981910 Needle Throttle Lever Retaining Screw (2pcs.) 29183200 Carburetor Rotor...

  • Page 21: O.s. Genuine Parts & Accessories

    O.S. GENUINE PARTS & ACCESSORIES SUPER FILTER IN-FLIGHT CONTROL GLOWPLUG DRIVE HUB ASSEMBLY (w / woodruff key) NEEDLE VALVE ( L ) (72403050) No.8 (71705000) (71608001) Drive Hub (27708010) Woodruff Key (27708200) (71605100) CAP SCREW SET CRANKSHAFT CLAMP LONG SOCKET WRENCH LOCK WASHER WITH PLUG GRIP (10set)

  • Page 22: Memo

    MEMO 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 Copyright 2005 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 60091740 110500...

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