O.S. engine Max-37SZ-Hring Owner's Instruction Manual
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O.S. engine Max-37SZ-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.
CONTENTS
INTRODUCTION, BEFORE STARTING
STARTING, RUNNING-IN ("Breaking-in")
2-5
6-7
ADJUSTMENT CHART
7-8
9-12
13-14
ENGINE EXPLODED VIEW & PARTS LIST
15-16
CARBURETOR EXPLODED VIEW & PARTS LIST
17-18
18-20
1
21-23
24
25
26
27
28-31
32-33
34-35
36
37
38

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Summary of Contents for O.S. engine Max-37SZ-Hring

  • Page 1: Table Of Contents

    CONTENTS ADJUSTMENT 21-23 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE SUBSEQUENT READJUSTMENTS CARBURETOR CLEANLINESS NOTES ON INSTALLING, COOLING-FAN AND CLUTCH ADJUSTMENT CHART 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 • 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 And Clutch

    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 similar into the exhaust port.

  • Page 5: Notes When Applying An Electric Starter

    NOTES WHEN APPLYING AN ELECTRIC STARTER Do not over-prime. This could cause 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. Cover the head with a rag to prevent pumped out fuel getting into your eyes.
  • Page 6 Fuel In case of 1.5volt dry cell Select, by practical tests, the most suitable fuel from Battery leads 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.

  • Page 7: Engine Parts Name

    LONG SOCKET DRIVER WITH PLUG GRIP Recommended for easy removal and replacement of the angled and recessed glowplug, the O.S.Long Socket Wrench incorporates a special grip. End Wrenches 8mm, 13mm, 14mm, etc. Needle Nose Pliers ENGINE PARTS NAME Heatsink Head Glowplug Rotor Guide Screw Mixture Control Valve...

  • Page 8: Facts About Glowplugs

    INSTALLING INSTALLATION OF THE ENGINE THE GLOWPLUG The under-surfaces of all O.S. engine beam mounting lugs are precision machined flat and Install washer on glowplug and insert carefully into exactyly parallel to the engine's horizontal axis. It is Heatsink-head, making sure that it is not cross- essential that the engine mounts in the model are threaded before tightening firmly.

  • Page 9: Carburetor Controls

    CORRECT Front view Side view Top surfaces are in the same plane. Make sure that only the under-surfaces of the INCORRECT engine’s mounting lugs are in contact with the engine mount. Please note that crankcase volume of the 37SZ-H is a little larger than the 32SX-H’s. If the crankcase body touches the mount, chamfer the edges of the mount.
  • Page 10 Graduations on the carburetor body STARTING Be sure to use a muffler pressurized fuel feed. Use Fully opened position Approx. the same fuel as you intend to employ for actual operation of your model. Opening and closing of the Needle-Valve Fully closed position Turn the needle clockwise to close the needle-valve, and turn...

  • Page 11: Adjustment

    NOTE: RUNNING-IN ("Breaking-in") If the throttle response is poor or the engine stops due to a temporarily over-rich mixture im- All internal-combustion engines benefit, to some mediately after the engine is started, pinch the degree, from extra care when they are run for the first fuel line for one or two seconds until the engine few times known as running-in or breaking-in.
  • Page 12 Hover the model and actuate the throttle to lf, at this time, the engine is slow to pick up and observe response over the medium speed range. produces an excess of exhaust smoke, the mixture lf the engine smokes excessiveIy and throttle is too rich.

  • Page 13: 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 adjustments to the Needle Valve occasionally, to take can easily partially obstruct these orifices and upset...
  • Page 14 ADJUSTING CHART Open the Needle Valve 1.5 turns from the fully closed position. Make sure that the Mixture Control Valve is at the factory setting. Start the engine Warm up the engine Observe the mixture condition while "floating" the model Lean mixture Rich mixture Turn the Mixture...

  • Page 15: Installation Of Throttle Servo

    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 Throttle control rod A and B should be equal of length. Locate the servo so that its output arm and the Set the linkage so that the servo output arm and throttle throttle pushrod are, as closely as possible, directry arm become parallel when the throttle stick on the trans-...

  • Page 16: 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 17 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 is loose Symptom Not reaching expected peak r.p.m. Cause Corrective action Set the needle only after warming up.
  • Page 18 ENGINE EXPLODED VIEW ENGINE PARTS LIST C.M3x15 Code No. Description 23414300 Heatsink Head 23413100 Cylinder Liner 25403400 Piston Ring 0.2mm 23413200 Piston 23406000 Piston Pin 24517000 Piston Pin Retainer (2pcs.) 23415000 Connecting Rod 23483000 Carburetor Complete (Type 20M) 23210007 Propeller Nut 22620003 Thrust Washer 22831000...
  • Page 19 CARBURETOR EXPLODED VIEW C.M3x8 N.+M3.5x5 ＊ 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 Code No. Description 27381410 Throttle Lever Assembly 22826131 Throttle Lever Retaining Screw (2pcs.) 23483200 Carburetor Rotor 23483100 Carburetor Body 45581820...

  • Page 20: O.s. Genuine Parts & Accessories

    O.S. GENUINE PARTS & ACCESSORIES GLOWPLUG DRIVE HUB SUPER FILTER CRANKSHAFT CLAMP (23408000) ( L ) (71530600) No.8 (72403050) (71608001) (71605300) (71605100) LONG SOCKET WRENCH CAP SCREW SET LOCK WASHER WITH PLUG GRIP (10set) M2.6x7 (10pcs.) (71521000) (79871020) (55500002) The specifications are subject to alteration for improvement without notice. 7.5 7.5 THREE VIEW DRAWING SPECIFICATIONS...

  • Page 21: 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 60091520 010603 Copyright 2004 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.

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Max-37sz-hring

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