O.S. engine MAX-12LD Owner'S Instruction Manual Download Page 2

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CONTENTS

SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE

INTRODUCTION, BASIC ENGINE PARTS

ENGINE SHIELD, INSTALLATION

THROTTLE LINKAGE
AIR CLEANER

NOTES CONCERNING
THE RECOIL STARTER

GLOWPLUGS

TOOLS, ACCESSORIES, etc.

CARBURETOR CONTROLS

STARTING THE ENGINE &
RUNNING-IN('Breaking-in)

IF THE ENGINE FAILS TO START

FINAL ADJUSTMENT

CARBURETOR CLEANLINESS

CARE AND MAINTENANCE
PARTS REPLACEMENT

EXPLODED VIEW &
ENGINE PARTS LIST

CARBURETOR EXPLODED VIEW
& PARTS LIST

O.S. GENUINE PARTS &
ACCESSORIES

THREE VIEW DRAWING

MEMO

Summary of Contents for MAX-12LD

Page 1: ...ontained 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 vehicle radio control equipment etc are accessible for checking at the same time ...

Page 2: ... TOOLS ACCESSORIES etc CARBURETOR CONTROLS STARTING THE ENGINE RUNNING IN Breaking in IF THE ENGINE FAILS TO START FINAL ADJUSTMENT CARBURETOR CLEANLINESS CARE AND MAINTENANCE PARTS REPLACEMENT EXPLODED VIEW ENGINE PARTS LIST CARBURETOR EXPLODED VIEW PARTS LIST O S GENUINE PARTS ACCESSORIES THREE VIEW DRAWING MEMO 2 5 15 16 17 17 18 18 19 20 23 26 27 24 25 28 7 8 8 9 9 10 10 11 11 12 13 15 12 6 1 ...

Page 3: ...equest that these instructions are also passed on to its new owner SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE The advice which follows applies basically to ALL MODEL ENGINES and is grouped under two headings according to the degree of damage or danger which might arise through misuse or neglect WARNINGS NOTES These cover events which might involve serious in extreme circumstances even ...

Page 4: ...es of sparks or anything else which might ignite it Do not smoke or allow anyone else to smoke near to it Never operate your engine in an en closed space Model engines like automobile 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 Contact with the muffler silencer cylinder...

Page 5: ... of the most powerful highspeed engines may eventually impair your hearing and such noise is also likely to cause annoyance to others over a wide area The wearing of safety glasses is also strongly recommended Take care that the glowplug clip or battery leads do not come into contact with rotating parts Also check that the linkage to the throttle arm is secure For their safety keep all onlookers e...

Page 6: ...sion WITHOUT the glowplug battery being reconnected Do not attempt to disassemble the recoil starter of the 12LD X and 15LD X If you do so the very strong spring inside will be suddenly ejected This can be very dangerous Do not extend the starter cord more than 45cm 18 Do not abruptly release the operating handle Allow the cord to rewind smoothly while still holding the handle Pull the operating h...

Page 7: ...g the fixing screws Use LOCTITE sparingly as excess sealant will have a deleterious effect on the shield material Apply a little LOCTITE to these screw holes INSTALLATION OF ENGINE Make sure that the chassis is flat and free from flaws or dirt The recommended screws for securing the engine to the chassis are 3mm 8 to 10mm long In the case of the 12 15LD X fit the engine mount spacers between the e...

Page 8: ...hat link age rod and upper plate become parallel and then retighten it securely If the linkage rod and upper plate are not paral lel throttle valve will not move smooth ly and may dam age the carburettor Adjust the ball link position so that linkage rod and upper plate become parallel by loosening 3mm set screw Upper plate Throttle servo 3mm set screw Chassis AIR CLEANER The air cleaner of this en...

Page 9: ...parts FILTER ELEMENT AND ITS REPLACEMENT The elements are already impregnated with a special filter oil As this oil is very sticky take care when handling them to prevent dust or dirt from adhering to the elements If your fingers become contaminated wash them with soap and water During storage the filter oil may become unevenly dispersed through the element This will be indicated if the blue colou...

Page 10: ...allowing higher rpm the plug becomes hotter and appropriately fires the fuel air charge earlier conversely at reduced rpm the plug become cooler and ignition is retarded Since the compatibility of glowplug and fuel may have a marked effect on performance and reliability it may be worthwhile to choose the R C type plug found most suitable after tests Recommended O S plugs are No 8 A3 and A5 Careful...

Page 11: ...oint asthenitromethanecontentofthefuelisincreased As a starting point we recommend a fuel containing 10 20 nitromethane changing to a fuel containing more nitro only if necessary When the nitro content of the fuel isincreasedorthebrandoffuelischanged itisadvisable to initially run the engine with a richer needle valve setting so that the optimum setting for the new fuel may be rechecked as describ...

Page 12: ... of the purpose made manual or elec tric fuel pumps may be used to transfer fuel directly from your fuel container to the fuel tank ELECTRIC STARTER AND STARTER BATTERY Use an electric starter with 12 volt battery for starting the MAX 12LD and MAX 15LD CARBURETOR CONTROLS 10F The Needle Valve The Mixture Control Screw The Throttle Stop Screw For setting the minimum idling speed Needle Valve Thrott...

Page 13: ...and silencer STARTING THE ENGINE RUNNING IN Breaking in The following procedure is suitable for these engines when the O S T 1020 tuned silencer and a fuel containing up to 30 nitromethane are used Use the same fuel as is to be employed for all initial running and containing NOT LESS THAN 18 lubricant Temporarily remove the glowplug to check that it glows bright red when energized Open the Needle ...

Page 14: ... by profuse smoke from the exhaust It is vitally important to set the throttle at the correct position before attempting to start the engine If the engine is allowed to run with the throttle too far open under no load conditions it will rapidly overheat and may be seriously damaged Remember Next disconnect the glowplug battery and try running the car on the track If the engine stalls open the thro...

Page 15: ...le to idling speed then shut it off completely with the trim lever on the transmitter To cut off the fuel supply pinch the fuel delivery tube to the carburetor Repeat this procedure until 5 more tanks of fuel have been consumed during which time the throttle may be opened for brief bursts of increased power If the engine stops at medium speeds close the Mixture Screw 45 90 IF THE ENGINE FAILS TO S...

Page 16: ...y If at this point the engine puffs out an excessive amount of smoke and the vehicle does not accelerate smoothly and rapidly it is probable that the idling mixture is too rich FINAL ADJUSTMENT In this case turn the Mixture Control Valve clockwise 45 90 If on the other hand the engine tends to speed up momentarily and then cut out abruptly when the throttle is opened the idling mixture is too lean...

Page 17: ...o be reduced Finally beyond the nominal break in period a slight readjustment toward a leaner needle setting may be required to maintain performance CARBURETOR CLEANLINESS The correct functioning of the carburetor depends on its small fuel orifices remaining clear BALL LINK AND SLIDE VALVE EXTENSION It is seldom necessary to separate the slide valve extension from the slide valve itself For cleani...

Page 18: ...he minute particles of foreign matter that are present in any fuel may by accumulating and partially obstructing fuel flow cause engine performance to become erratic and unreliable One of these filters fitted to the outlet tube inside your refueling container will prevent the entry of foreign material into the fuel tank It is also recommended that a good in line filter be installed between the tan...

Page 19: ...licone fuel tubing Caution The rear crankshaft bearing of this engine uses a special plastic retainer If the front housing needs to be heated to remove or replace the bearing do not allow the bearing to exceed 120 C 248 F otherwise it may be damaged and rendered unserviceable PARTS REPLACEMENT Over a long period depending on how well your engine is protected from the ingress of harmful dust and gr...

Page 20: ... LD T EXPLODED VIEW Type of screw C Cap Screw M Oval Fillister Head Screw F Flat Head Screw N Round Head Screw S Set Screw 1 2 3 4 5 6 7 8 9 0 q w e N M3x27 C M2 6x12 15LD t r N M2 6x15 M M2 6x12 12LD M M2 6x7 20 ...

Page 21: ...ust Header Pipe E 1000 Silencer 12LD 12LD 12LD 12LD 12LD 12LD e w q 0 9 8 7 6 5 4 3 2 1 7 1608 001 7 1605 300 2 1524 000 2 1164 000 2 1152 000 2 1230 000 7 2103 410 2 1313 030 2 1163 000 2 2631 019 2 1408 000 2 0810 007 2 1205 040 2 1706 000 2 1206 000 2 1503 000 2 1203 011 2 1554 000 2 1154 000 7 2403 420 r t No 7 2403 410 7 2403 510 2 1183 000 2 1151 000 2 1551 000 2 1157 000 12LD 12LD 15LD 15LD...

Page 22: ...ODED VIEW Type of screw C Cap Screw M Oval Fillister Head Screw F Flat Head Screw N Round Head Screw S Set Screw 1 2 3 4 5 6 7 8 9 0 q w e N M3x27 C M2 6x12 15LD X t r N M2 6x15 M M2 6x12 12LD X N M2 6x7 y 1 y y 2 u M M2 6x7 22 ...

Page 23: ...000 2 1313 030 y u 7 3003 000 y 1 y 2 7 3003 100 7 3003 200 7 2404 100 104 Filter Elements 3pcs Screw Set Glow Plug A3 Gasket Set Crankshaft Crankshaft Ball Bearing Rear Crankcase Crankshaft Ball Bearing Front Carburetor Complete Type 10F Connecting Rod Piston Pin Cylinder Piston Assembly Engine Shield Propeller Nut Drive Hub Engine Mount Spacer Heatsink Head Crankcase Exhaust Header Pipe E 1000 S...

Page 24: ...g Needle Valve Assembly Throttle Stop Screw O Ring S O Ring L Mixture Control Valve Assembly Description Code No 1 1 1 1 2 2 2 1 2 2 3 4 5 6 7 8 9 0 q N M2 6x7 S 3x3 No 0 9 8 7 6 5 4 3 2 1 2 1481 900 2 7881 820 2 1481 950 2 1285 600 4 6066 319 2 2781 800 2 1285 640 2 1183 700 2 1181 837 2 1183 100 2 1285 220 2 1165 000 2 1285 200 2 1285 400 2 1285 210 2 1285 520 2 3818 410 1 1 1 2 2 1 2 2 q 10F CA...

Page 25: ...05300 71605100 No 8 A3 A5 72403420 104 Filter Elements 3pcs 72103310 Super Joint Tube 15 72103020 T 1020 Tuned Silencer φ4 73300305 φ7 73300712 Dust Cap Set For Carburettor Nipple For T 1020 Tuned Silencer 71521000 Long Socket Wrench With Plug Grip E 1000 Silencer For TAMIYA TGX TG10 25 ...

Page 26: ...12 15LD THREE VIEW DRAWING 2 11 cc 0 129cu in 14 0 mm 0 551in 13 7 mm 0 539in 3 000 30 000 r p m 0 56 bhp 29 000 r p m 273g 9 64oz Dimensions mm Displacement Bore Stroke Practical R P M Power output Weight MAX 15LD SPECIFICATIONS 2 49 cc 0 152cu in 15 2 mm 0 598in 13 7 mm 0 539in 3 000 30 000 r p m 0 68 bhp 29 000 r p m 273g 9 64oz 26 ...

Page 27: ... Power output Weight MAX 12LD X SPECIFICATIONS 2 11 cc 0 129cu in 14 0 mm 0 551in 13 7 mm 0 539in 3 000 30 000 r p m 0 56 bhp 29 000 r p m 336g 11 86oz Displacement Bore Stroke Practical R P M Power output Weight MAX 15LD X SPECIFICATIONS 2 49 cc 0 152cu in 15 2 mm 0 598in 13 7 mm 0 539in 3 000 30 000 r p m 0 68 bhp 29 000 r p m 336g 11 86oz 27 ...

Page 28: ...MEMO 28 ...

Page 29: ...ghts reserved Printed in Japan U N EQUALLED QUALITY PRECISION PERFORMAN C E ESTABLISHING THE STANDARDS OF EXCELLENC E 100000 TEL 06 6702 0225 FAX 06 6704 2722 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan URL http www os engines co jp ...

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