Table of Contents
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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
NOTES ON INSTALLING THE ENGINE,
NOTES ON HEATING THE GLOW PLUG
INTRODUCTION
2-5
STARTING, RUNNING-IN ("Breaking-in")
6
7
8
ADJUSTMENT CHART
9
10
11
EXPLODED VIEW & PARTS LIST
12
13-16
16 18
1
19
20-21
22-24
24-27
28
29
30
31
32-35
36
37
38
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Table of Contents
Related Manuals for O.S. engine MAX-91SX-HRING C Spec PS VIPER
Summary of Contents for O.S. engine MAX-91SX-HRING C Spec PS VIPER
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Page 1: Table Of Contents
It is suggested that any instructions supplied with the model, radio control equipment, etc., are accessible for checking at the same time. CONTENTS FACTS ABOUT GLOWPLUG SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE CARBURETOR CONTROLS 20-21 NOTES ON INSTALLING, STARTING, RUNNING-IN ("Breaking-in") 22-24... -
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 Mount the engine in your model securely, fol- other adjustments to the carburetor.
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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 the piston may be... -
Page 5: Basic Engine Parts
FEATURES Note: As delivered, the carburetor is not fit to The MAX-91SX-H RING C-Spec PS VIPER is the engine. installed with VIPER twin-plug head made by OMI, USA instead of the original head. Note: Twin-plug haw power increase effect and special head material develops extreme Because of initial tightness, a standard cooling effect. -
Page 6: Installation Of The Engine
INSTALLATION OF THE ENGINE Top surfaces are not Top surfaces are not in the The under-surfaces of all O.S. engine beam in the same plane. same plane. mounting lugs are precision machined flat and Engine does not rest firmly. -
Page 7: Care Of Fuel Pump
CARE OF FUEL PUMP NEVER disassemble the fuel pump or pressure regulator. Their original performance may not be restored after reassembly. NEVER insert anything into the inlet or outlet nipples in an attempt to clear a suspected obstruction. Do not more the pump adjusting screw at the center a the adjustment gets out of order and the Pressure adjusting screw parts inside is damaged. -
Page 9: Before Starting 16
The pump requires running-in as with the engine. Be BEFORE STARTING sure to check the silicone tubes and connections Tools, accessories, etc. carefully for any cracks on the tubes and loose The following items are necessary for operating the connections as the engine runs ejecting excess fuel. engine. -
Page 10: Facts About Glowplug
7 Fuel pump Fuel pumps 10 Plug wrench For filling the fuel tank one of the Used for tightening glowplug. The purpose-made manual or electric fuel O.S. long plug wrench is available pumps may be used to transfer fuel as an optional accessory. For tightening Manual glowplug... -
Page 11: Carburetor Controls
CARBURETOR CONTROLS With a fixed-wing model, power failure is rarely a Idle MIxture Control Screw serious threat to the safety of the aircraft since it can usually glide down to a safe landing. In a helicopter, High Speed Needle Valve (Main Needle) on the other hand, it is vitally imporant that the engine keeps running and that there is a quick and reliable... - Page 12 3. Preparation of the starter STARTING Install the starting shaft to the Be sure to use a muffler pressurized fuel feed. Use starter securely. the same fuel as you intend to employ for actual Improper installation will allow the operation of your model. shaft swing creating...
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Page 13: Adjustment
RUNNING-IN ("Breaking-in") ADJUSTMENT Please observe the following before beginning to All internal-combustion engines benefit, to some make any adjustment. degree, from extra care when they are run for the first ー few times known as running-in or breaking-in. 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 14 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.
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Page 15: Subsequent Readjustments
SUBSEQUENT READJUSTMENTS CARBURETOR CLEANLINESS Once the engine has been run-in and the carburetor The correct functioning of the carburetor depends on controls properly set up, it should be unnecessary to its small fuel orifices remaining clear. alter the mixture settings, except to make minor The minute particles of foreign matter that are present changes to the Main (High-Speed) Needle Valve in any fuel can easily partially obstruct these orifices... -
Page 17: 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. Locate the servo so that its output arm and the throttle pushrod are, as close as possible, di- rectry in line with carburetor's throttle arm, as shown. - Page 19 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 Code No. Description Code No. Description 29084440 Return Screw 27381410 Throttle Lever Assembly 22826131 Throttle Lever Retaining Screw (2pcs.) 29084500 One-way Valve 29084200...
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Page 20: O.s. Genuine Parts & Accessories
O.S. GENUINE PARTS & ACCESSORIES O.S. GLOW PLUGS DRIVE HUB IN-FLIGHT CONTROL SUPER FILTER NEEDLE VALVE (72403050) (27708010) No.8 (71705000) (71608001) (71605100) ( L ) (71605300) LOCK WASHER CRANKSHAFT LONG SOCKET WRENCH Needle Adjusting CLAMP WITH PLUG GRIP Screw (10set) (5pcs.) 7091 M2.6x5... -
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 Copyright 2003 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 60091420 090301...