O.S. Engines 55HZ-H User Manual

It is of vital importance, before attempting to operate your eng ine, to read the gene ral 'SA FETY 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.

2-5

6-7

8-9

10-12

21-25

38-39

40-41

26-30

32-33

34-37

13-16

19-20

CONTENTS

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

NOTES ON INSTALLING COOLING-FAN AND CLUTCH

NOTES WHEN APPLYING AN ELECTRIC STARTER, INSTALLATION OF THROTTLE SERVO

NOTES ON HEATING THE GLOW PLUG INTRODUCTION, ENGINE PARTS NAME 

BEFORE STARTING, INSTALLATION OF THE ENGINE

INSTALLATION OF THE GLOW PLUG & CARBURETOR

GLOWPLUGS

CARBURETOR CONTROLS

STARTING, RUNNING-IN ("Breakingin")

ADJUSTMENT

ADJUSTMENT CHART

CARE AND MAINTENANCE

TROUBLE SHOOTING

ENGINE EXPLODED VIEW & PARTS LIST

CARBURETOR EXPLODED VIEW & PARTS LIST

O.S. GENUINE PARTS & ACCESSORIES

THREE VIEW DRAWING

MEMO

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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.

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

The advice which follows is grouped under two headings according to the degree of damage or danger which might arise through misuse or neglect.

WARNINGS

NOTES

Th e se co v er ev e nts wh ich mig h t inv o l ve se r ious (in extreme circumstances, even fatal) injury.

These cover the many other possibilities, generally less obvious sources of danger, but which, under certain circumstances, may also cause damage or injury.

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WARNINGS

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Never touch, or allow any object to come into contact with, the rotating parts.

Model engine fuel is poisonous. Do not allow it to come into contact with the eyes or mouth. Always store it in a clearly marked container and out of the reach of children.

Model engine fuel is also highly flammable . Keep it away from open flam e, excessive heat, sources of sparks, or anything else which might ignite it. Do not smoke or allow anyone else to smoke, near to it.

Model engines generate considerable heat. Do not touch any part of your engine until it has cooled. Contact with the muffler (silencer), cylinder head or exhaust header pipe, in particular, may result in a serious burn.

Never operate your engine in an enclosed space. Model engines, like automobile engines, exhaust deadly carbonmonoxide. Run your engine only in an open area.

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NOTES

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This engine was d es ig ned for model helicopters. Do not attempt to use it for any other purpose.

Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts.

Install an effective silencer (muffler). Frequent close exposure to a noisy exhaust (especially in the case of the more powerful high-speed engines) may eventually impair your hearing and such noise is also likel y t o c ause annoyance to others over a wide area.

Check the linkage to the throttle arm before each flight.

Avoid sudden high r.p.m. immediately after the engine is started, as the clutch will engage and you may be struck by the rotor.

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After starting the engine, carry out any needlevalve 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.

Use an electric starter. The wearing of safety glasses is also strongly recommended. Press the rotor head down securely.

Take care that the glow plug clip or battery leads do not come into contact with rotating parts.

Adjust the throttle linkage so that the engine stops when the throttle stick and trim lever on the transmitter are fully retarded. Alternatively, the engine may be stopped by cutting off the fuel supply. Never try to stop the engine physically.

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NOTES

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Take care that loose clothing (ties, shirt sleeves, scarves etc.) do not come into contact with the rotor. Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt pocket from where they could fall through the rotor disc.

For their safety, keep all onlookers (especially small children) well back (at least 20 feet or 6 metres) when preparing your model for flight. If you have to carry the model to the take-off point with the engine running, be especially cautious. Hold the rotor securely and keep well clear of spectators.

Warning! lmmediately after a glowplug-ignition engine has been run and is still warm, conditions sometimes exist whereby it is just possible for the engine to restart when turned over WITHOUT the glowplug battery being reconnected. Remember this if you wish to avoid the risk of accidents.

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.

Do not grip the engine mounting beams with a vise, or the crankcase will be distorted which will result in engine breaking.

Vise

Beam Mount

Notes on installing cooling fan and clutch

NOTES WHEN APPLYING AN ELECTRIC STARTER

Because of this initial tightness, 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. Cover the head with a rag to prevent pumped out fuel from getting into your eyes.

28 34

A=B

Linking the throttle servo to the carburetor Link the throttle servo to the carburetor using the throttle lever supplied. Throttle control rod A and B should be equal length. Set the linkage so that the servo output lever and throttle lever are parallel when the throttle stick on the transmitter is at middle position. Installing hole intervals on the F lever and on the J lever are different. Decide the lever to use according to the servo used. Be sure to cut off another lever to avoid any interference.

Note on heating the glow plug

The heatsink head on the engine is treated with an anodized finish which does not conduct current. Therefore, when heating a glow plug, connect one lead to the glow plug and the other to the cover plate retaining screw.

Example

INTRODUCTION

As delivered, the engine has the

carburetor lightly fit into the

intake. Secure it changing the

angle according to the model.

NOTE

STANDARD ACCESSOIES

Glow Plug No.8

Instruction manual

This is a high performance engine expressly

designed for 50 size helicopters. Since engine

mounting and muffler mounting bolt patterns

are the same as the 50SX-H Hyper, it can be

installed in the existing 50 size helicopters.

Newly designed 40L carburetor enables to

adjust idling, hovering and high speed

independently. Close to 60 size power offers

wide power range suitable for sport flight as

well as 3D flight.

Note on engine installation

The engine mounting bolt hole

size of the 55HZ Hyper is 3.7mm

the same as that for the 50SXH

Hyper. Use 3mm Allen type

screws for securing the engine to

the engine mounts.

Heatsink Head

Carburetor Type 40L

Crankshaft

Propeller nut

Crankcase

Glowplug

Beam Mount

Cover Plate

High Speed Needle Valve

Fuel Inlet

Mixture Control Valve

Throttle Lever

Idle Mixture Control Screw

Mixture Control Valve Stopper

Thrust Washer

Carburetor Rubber Gasket

Medium Speed Needle Valve

ENGINE PARTS NAME

Items necessary for starting

Tools, accessories, etc.The following items are necessary for operating the engine.

Glow Plug

O.S. No.8 is supplied with the engine.

Battery leads

Glowplug battery

The power source for heating the glowplug may be either a large heavy-duty 1.5volt dry cell, Ni-cd battery or glowplug Igniter.

1.5 volt dry cell

These are used to conduct current from the batter y to the glowplug. Basically, two leads, with clips, are required, but, for greater convenience, twin leads with special glowplug connectors, as shown on the right, are commercially available.

Battery leads

glowplug Igniter

Make sure glowplug element glows bright red inside room or shadow.

Battery leads

In case of 1.5volt dry cell

12V Battery

Starter

Electric starter and starter battery

An electric starter is recommended for starting.

Hexagon starting shaft

This shaft mounte d on an electric starting motor is driven into the shaft cup to turn the engine.

BEFORE STARTING

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