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4

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' recommenda-
tions, using appropriate screws and lock-
nuts.

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.

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.

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.

5

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.

Summary of Contents for MAX-46AX

Page 1: ...for checking at the same time 1 CONTENTS 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 RUNNING IN Breaking in IDLING ADJUSTMENT CHART MIXTURE CONTROLVALVE ADJUSTMENT REALIGNMENT ...

Page 2: ...sonous 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 Never operate your engine in an en closed space Model engines like auto mobile engines exhaust deadly carbon monoxide 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 C...

Page 3: ...ssary 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 an...

Page 4: ...er compression WITHOUT the glowplug battery being reconnected Remember this if you wish to avoid the risk of a painfully rapped knuckle 7 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 val...

Page 5: ...valve unit through 90 and re attach it to the bracket in the required position see sketch right Vertical position Factory position Cover plate fitting holes Needle Valve unit Needle Valve unit attachment screws Needle Valve Assembly Bracket 1 2 Cover plate Retaining Screw 9 INSTALLATION OF THE ENGINE Rigid hardwood e g maple At least 15mm 5 8 At least 15mm 5 8 O S radial motor mount Available as a...

Page 6: ...e 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 Throttle Lever Fixing Screw 11 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...

Page 7: ... containing a moderate percentage of nitromethane unless more is essential for racing events Do not run the engine too lean and do not leave the battery connected while adjusting the needle However plug life can be extended and engine performance maintained by careful use i e Apart from when actually burned out a plug may need to be replaced because it no longer delivers its best performance such ...

Page 8: ...T 18 lubricant by volume Some fuels containing coloring additives tend to deteriorate and may adversely affect running qualities Once a satisfactory fuel has been selected and used for a while it may be unwise to needlessly change the brand or type In any engine a change of fuel may cause carbon deposits in the combustion chamber or on the piston head to become detached and lodged elsewhere with t...

Page 9: ...nce twin leads with special glowplug connectors as shown on the right are commercially available 17 12V Battery Starter 6 Fuel tank For installation in the model a 300cc 10 6oz tank is suggested 7 Fuel bottle or pump For filling the fuel tank a simple polyethylene squeeze bottle with a suitable spout is all that is required Alternatively one of the purpose made manual or electric fuel pumps may be...

Page 10: ... allows the working parts to mate together under load at operating temperature Therefore it is vitally important to complete the break in before allowing the engine to run continuously at high speed and before finalizing carburetor adjustments However because O S engines are produced with the aid of the finest modern precision machinery and from the best and most suitable materials only a short an...

Page 11: ... to arrive at the optimum setting Optimum needle setting 1 Optimum needle setting 2 21 20 45 Needle valve adjustment diagram This diagram is for reference purposes only Actual needle positions may differ from those shown To stop the engine close the throttle completely to cut off fuel air supply Note Practical best optimum needle valve setting Exhaust note starts to change Disconnect battery leads...

Page 12: ...ontrol Screw clockwise 15 30 If the mixture is excessively rich engine rpm will become unstable opening the throttle will produce a great deal of smoke and rpm may drop suddenly or the engine may stop This condition may also be initiated by excessively prolonged idling If on the other hand the mixture is too lean this will be indicated by a marked lack of exhaust smoke and a tendency for the engin...

Page 13: ...nsating carburetor readjustments Note 1 2 25 CARBURETOR CLEANLINESS ENGINE CARE AND MAINTENANCE At the end of each operating session drain out any fuel that may remain in the fuel tank Next energize the glowplug and try to restart the engine to burn off any fuel that may remain inside the engine Repeat this procedure until the engine fails to fire Remove the glowplug and eject any re sidue by rota...

Page 14: ...shaft Ball Bearing F Crankcase Crankshaft Ball Bearing R Crankshaft Gasket Set Cover Plate Needle Stay Needle Valve Unit Assembly Needle Assembly O Ring 2pcs Set Screw Ratchet Spring Needle Valve Unit Body Needle Valve Unit Retaining Screw Screw Set Glow Plug A3 E 3010 Silencer Assembly Pressure Fitting No 7 Assembly Screw Retaining Screw C M3x35 2pcs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1...

Page 15: ...e specifications are subject to alteration for improvement without notice 6 7 8 N M3 5x6 1 2 3 4 5 1 1 1 2 2 1 1 1 1 1 2 2 2 1 3 4 5 6 7 8 24681410 22681419 22781420 24681610 22781800 24681200 24681100 45581820 22681953 46215000 25081700 No Code No Description 29 No 8 71608001 A5 71605100 73101020 23024009 1 4 28 L 73101000 1 4 28 71913100 72200080 25425020 873S O S GLOW PLUGS O S GENUINE PARTS AC...

Page 16: ...00 79870040 M4 25425600 M4 55500003 SILENCER EXTENSION ADAPTORS 31 7 45cc 0 455cu in 22 0mm 0 866in 19 6mm 0 772in 2 000 17 000r p m 1 65ps 16 000r p m 375g 13 2oz 114g 4 02oz Displacement Bore Stroke Practical R P M Power output Weight SPECIFICATIONS Dimensions mm THREE VIEW DRAWING E 3010 Silencer Assembly JAPAN 3 7 4 UNF1 4 28 38 1 44 4 119 4 27 2 60 4 7 24 8 36 3 17 5 17 8 67 4 48 100 5 35 51 ...

Page 17: ...ts reserved Printed in Japan 090300 TEL 06 6702 0225 FAX 06 6704 2722 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan U N E Q U A LLED QUALITY PRECISION PERFOR M A N C E E S T A BLISHING THE STANDARDS OF EXCELLE N C E URL http www os engines co jp ...

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