O.S. Engines 46AX User Manual

Name: O.S. Engines 46AX
Brand: O.S. Engines
SKU: 1713039
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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 2-6 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 aircraft, radio control equipment, etc., are accessible for checking at the same time.

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

INTRODUCTION, BEFORE INSTALLING THE ENGINE

BASIC ENGINE PARTS NEEDLE-VALVE LOCATION

INSTALLATION OF THE ENGINE THROTTLE LINKAGE SILENCER FUEL TANK LOCATION GLOWPLUG FUEL, PROPELLERS MIXTURE CONTROLS BEFORE STARTING

CONTENTS

2-6

9-10

10 11 12 13

14-15

16-17

STARTING RUNNING-IN (Breaking-in) IDLING ADJUSTMENT CHART

MIXTURE CONTROLVALVE ADJUSTMENT, REALIGNMENT OF MIXTURE CONTROL

VALVE SUBSEQUENT STARTING PROCEDURE

SUBSEQUENT READJUSTMENT CARBURETOR CLEANLINESS,

ENGINE CARE AND MAINTENANCE ENGINE EXPLODED VIEWS &

ENGINE PARTS LISTS CARBURETOR EXPLODED VIEWS

& PARTS LISTS O.S. GENUINE PARTS & ACCESSORIES ENGINE THREE VIEW DRAWINGS MEMO

17-18 19-21

26-27

29-30

31 32

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

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.

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

These cover events which might involve serious (in extreme circumstances, even fatal) injury.

WARNINGS

Never touch, or allow any object to come into contact with, the rotating propeller and do not crouch over the engine when it is running.

A weakened or loose propeller may disintegrate or be thrown off and, since propeller tip speeds with powerful engines may exceed 600 feet(180 metres) per second, it will be understood that such a failure could result in serious injury, (see 'NOTES' section relating to propeller safety).

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.

NOTES

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

Model engine fuel is also highly flammable. Keep it away fr om open flame, excessive heat, sources of sparks, or anything else which might ignite it. Do not smoke or allow any one else to smoke, near to it.

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

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.

NOTES

This engine was designed for model aircraft. 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.

Be sure to use the silencer (muffler) supplied with the engine. Frequent exposure to an open exhaust may eventually impair your hearing. Such noise is also likely to cause annoyance to others over a wide area.

If you remove the glowplug from the engine and check its condition by connecting the battery leads to it, do not hold the plug with bare fingers.Use an appropriate tool or a folded piece of cloth.

Install a top-quality propeller of the diameter and pitch specified for the engine and aircraft. Locate the propeller on the shaft so that the curved face of the blades faces forward-i.e. in the direction of flight. Firmly tighten the propeller nut, using the correct size wrench.

NOTES

Always check the tightness of the propeller nut and retighten it, if necessary, before restarting the engine, particularly in the case of four-stroke-cycle engines. If a safety locknut assembly is provided with your engine, always use it. This will prevent the propeller from flying off in the event of a "backfire", even if it loosens.

If you fit a spinner, make sure that it is a precision made product and that the slots for the propeller blades do not cut into the blade roots and weaken them.

Preferably, use an electric starter. The wearing of safety glasses is also strongly recommended.

Discard any propeller which has become split, cracked, nicked or otherwise rendered unsafe. Never attempt to repair such a propeller: destroy it. Do not modify a propeller in any way, unless you are highly experienced in tuning propellers for specialized competition work such as pylon-racing.

Take care that the glow plug clip or battery leads do not come into contact with the propeller. Also check the linkage to the throttle arm. A disconnected linkage could also foul the propeller.

After starting the engine, carry out any needle-valve readjustments from a safe position behind the rotating propeller. Stop the engine before attempting to make other adjustments to the carburetor.

NOTES

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.

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

Do not start your engine in an area containing loose gravel or sand. The propeller may throw such material in your face and eyes and cause injury.

For their safety, keep all onlookers (especially small children) well back (at least 20 feet or 6 meters) 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. Keep the propeller pointed away from you and walk well clear of spectators.

Warning! Immediately after a glowplugignition engine has been run and is still warm, conditions sometimes exist whereby it is just possible for the engine to abruptly restart if the propeller is casually flipped over compression WITHOUT the glowplug battery being reconnected. Remember this if you wish to avoid the risk of a painfully rapped knuckle!

INTRODUCTION

This engine is ideally suited to a variety of R/C aircraft, including trainer, sports, aerobatic and scale types.

A separate precision-made needle-valve unit is installed at the rear, where manual adjustment is safely remote from the rotating propeller.

The needle-valve assembly can be installed either horizontally or vertically.

Standard accessories

Glow Plug A3 E-3010 Silencer Assembly Silicone Tube Instruction Manual

Note : With these engines, the piston will feel tight at the top of its stroke when the engine is cold. This is normal. The piston and cylinder are designed to achieve a perfect running clearance when they reach their intended running temperature.

BEFORE INSTALLING THE ENGINE

Installing the glowplug

Carefully insert plug, with washer, fingertight only, before final tightening with the correct size plug wrench.

Connecting fuel tubing

Connect the short length of fuel tubing (supplied) securely between the needle-valve outlet and carburetor inlet as shown in the illustration on the next page. In the event of the tubing becoming damaged, it should be replaced with 54-56mm length of 5mm ODx2mm ID silicone tubing. Use similar material to connect the fuel inlet nipple to the fuel tank.

Glow plug

Washer

BASIC ENGINE PARTS

Cylinder head

Carburetor

Throttle Lever

Crankshaft

Fuel inlet

Drive Hub

Propeller washer

Propeller nut

Glowplug

Crankcase

Fuel inlet

Needle valve

Fuel outlet

Cover Plate

Silicone T ube

Beam Mount

NEEDLE-VALVE LOCATION

The procedure for relocating the needle-valve is as follows:

Remove the two cover-plate screws which secure

1. the needle-valve assembly bracket, then carefully remove the two screws by which the needle-valve unit is attached to the bracket.

Rotate the needle-valve unit through 90˚ and re-

2. attach it to the bracket in the required position (see sketch right).

Note: As self-tapping screws are used for unit attachment, screw them in carefully so that screw threads match those of the unit body precisely.

Finally, secure the complete assembly to rear cover

3. plate as before.

Cover plate Retaining Screw

Cover plate fitting holes

Needle-Valve Assembly Bracket

Needle Valve unit attachment screws

Needle Valve unit

Vertical position (Factory position)

INSTALLATION OF THE ENGINE

Installation in the model

A typical method of beam mounting is shown below, left.

Rigid hardwood (e.g. maple)

At least



15mm(5/8")

O.S. radial motor mount

For 46AX, 50SX, 40/46FX (Code No. 71913100)

At least 15mm(5/8")

O.S. radial motor mount (Available as an optional extra part. See parts list)

Make sure that the mounting beams are parallel and that their top surfaces are in the same plane.

CORRECT

Front view

Top surfaces are in the same plane.

Side view

INCORRECT

Top surfaces are not in the same plane.

Re-align the surfaces as necessary

Opposite beam

Top surfaces are not in the same plane.

Engine does not rest firmly.

How to fasten the mounting screws.

Hardwood mounting beams

3mm steel nuts

Spring washer or lock washer

3mm steel screw

O.S. radial motor mount (cast aluminum)

Tighten second nut firmly down onto first nut.

Tighten this nut first.

Hardwood such as cherry or maple.

Steel washer

3.5mm steel Allen screw Spring washer

THROTTLE LINKAGE

Before connecting the throttle-lever/ servo linkage, make sure that no part of the linkage interferes with the internal structure of the aircraft or wiring, etc., when the throttle is fully open or fully closed.

Set the throttle lever linkage so that the throttle rotor is (a) fully open when the transmitter throttle stick is fully advanced and (b) fully closed when the throttle stick is fully retarded. Adjustment of the throttle rotor opening at the idling position can then be made with the throttle trim lever on the transmitter. (Select throttle-lever and servo-horn hole positions that will avoid excessive pushrod travel causing the throttle to bind at either end.)

Throttle Lever Fixing Screw

Note: When adjusting the throttle lever angle, relative to

the rotor,hold the rotor at about half-way between the open and closed positions while loosening and tightening the fixing screw, otherwise the rotor, rotor guide screw,throttle stop screw or carburettor body may become burred and damaged.

SILENCER

Secure the silencer to the engine by means of two fitting screws supplied after the engine is securely fixed to a test bench or a model.

The exhaust outlet of the silencer can be rotated to any desired position in the following manner:

Loosen the locknut and assembly screw.

Set the exhaust outlet at the required position by rotating the rear part of the silencer.

Re-tighten the assembly screw, followed by the locknut.

It is recommended to seal the fitting faces of engine exhaust and silencer with silicone sealant.

NOTE : The standard expansion-chamber type silencer is

quite effective, but reduces power to some degree.

E-3010 Silencer

Exhaust pressure nipple

Reminder!

Assembly screw

Cone baffle

Turn to requlred position

Exhaust outlet

Locknut

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