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Remember that your engine is not a "toy", but a highly efficient internal-
combustion 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

These cover events which 
might involve serious (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

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

Model engine fuel is poison-
ous. 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 flame, 
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 en-
closed space. Model engines, like auto-
mobile engines, exhaust deadly carbon-
monoxide. Run your engine only in an 
open area.

Summary of Contents for MaX-37SZ-HRING

Page 1: ...quipment etc are accessible for checking at the same time 1 CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE NOTES ON INSTALLING COOLING FAN AND CLUTCH NOTES WHEN APPLYING AN ELECTRIC S...

Page 2: ...many other possibilities generally less obvious sources of danger but which under certain circumstances may also cause damage or injury 3 WARNINGS Never touch or allow any object to come into contact...

Page 3: ...ead 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...

Page 4: ...engineering plastic and locks the crankshaft without risk of damage to any part of the engine Application is as follows Remove the crankcase rear cover plate from the engine and rotate the crankshaft...

Page 5: ...able for sport flight as well as 3D flight INTRODUCTION STANDARD ACCESSOIES Glow Plug No 8 Instruction manual Items necessary for starting Tools accessories etc The following items are necessary for o...

Page 6: ...ntact with the eyes or mouth Always store it in a clearly marked container and out of the reach of children Reminder Fuel Model engine fuel is also highly flammable Keep it away from open flame excess...

Page 7: ...Long Socket Wrench incorporates a special grip End Wrenches 8mm 13mm 14mm etc Needle Nose Pliers 13 ENGINE PARTS NAME Heatsink Head Carburetor Typr 20M Crankshaft Propeller nut Crankcase Glowplug Beam...

Page 8: ...ting 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...

Page 9: ...tle this establishes the basic fuel air mixture strength This is then maintained by the carburetor s automatic mixture control system to cover the engine s requirements at reduced throttle settings Th...

Page 10: ...erous Approx 19 4 5 6 Checking the rotating direction of the starter Make sure that the starter rotates to the direction shown in the sketch If the direction is reverse reverse the leads on battery In...

Page 11: ...ining relatively large percentages of power boosting nitromethane operate at richer mixture settings than are needed for mild fuels and will therefore require the Needle Valve to be readjusted accordi...

Page 12: ...is flying at full throttle lf at full throttle acceleration is poor the H I J K L 23 exhaust unduly smoky and the model fails to reach expected straight line speed the mixture is too rich and the Need...

Page 13: ...e Valve setting The use of a different glowplug or changes to the mainrotor and its pitch angles may also require compensating carburetor readjustments CARBURETOR CLEANLINESS The correct functioning o...

Page 14: ...r approx 10 seconds then reopen throttle to observe transition Float the model Turn the Mixture Control Valve counter clockwise Idle OK Turn the Mixture Control Valve clockwise Lean mixture Rich mixtu...

Page 15: ...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 tank and carburetor 1 Finally injectsomeaft...

Page 16: ...ce if necessary Incorrect carburetor settings Return the needle valve and mixture control valve to basic position Incorrect servo linkage Re linkage after setting servo at neutral Reverse rotating dir...

Page 17: ...or disconnected Check the connections and secure them Fuel tubing from tank to is split or broken Replace the tubing 31 Symptom Cause Corrective action Symptom Cause Corrective action Poor response D...

Page 18: ...2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Description Code No No Screw Set Cover Plate Gasket Set Crankshaft Crankshaft Bearing Rear Crankcase Crankshaft Bearing Front Thrust Washer Propeller Nut Carbu...

Page 19: ...ly Throttle Lever Retaining Screw 2pcs Carburetor Rotor Carburetor Body Rotor Guide Screw Needle Valve Assembly Needle Assembly O Ring 2pcs Needle Valve Holder Assembly Needle Valve Holder Ratchet Spr...

Page 20: ...tion for improvement without notice GLOWPLUG DRIVE HUB CRANKSHAFT CLAMP M2 6x7 CAP SCREW SET 10pcs 23408000 79871020 37 THREE VIEW DRAWING Displacement Bore Stroke Practical R P M Power output Weight...

Page 21: ...ight 2004 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 60091520 010603 TEL 06 6702 0225 FAX 06 6704 2722 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan URL http www os...

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