O.S. engine MaX-37SZ-HRING Manual Download Page 6 | Manualshive

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O.S. engine MaX-37SZ-HRING Manual Download Page 6

10

INTRODUCTION

Throttle lever is not installed on
the carburetor when the engine
leaves the factory.
Install it before using the engine.

NOTE

STANDARD ACCESSOIES

Glow Plug No.8

Throttle Lever Assembly

This  is  a  high  performance  engine
designed  for  small-sized  radio-
controlled helicopters.
Since the mounting bolt pattern of the
engine as well as silencer is the same as
those of the 32SX-H, it can be directly
replaced  with  the  32SX-H  and  most  of
other 32-39 size engines. This powerful
engine is suitable for sport flight as well
as 3D flight.

With some models, needle interferes the
body and working on the body to avoid
this would be required.

Instruction manual

11

ENGINE PARTS NAME

Needle Valve

Fuel Inlet

Mixture Control Valve

Throttle Lever

Rotor Guide Screw

Carburetor Gasket

Heatsink Head

Carburetor

Type 20M

Crankshaft

Propeller nut

Crankcase

Glowplug

Beam Mount

Cover Plate

Thrust Washer

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Summary of Contents for MaX-37SZ-HRING

Page 1: ...he model radio control equipment etc are accessible for checking at the same time 1 2 5 6 7 8 9 10 11 16 20 23 29 36 37 38 39 40 24 28 17 30 31 32 35 12 15 18 19 41 42 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 INTRODUCTION ENGINE PARTS NAME BEFORE STARTING INSTALL...

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 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 Mode...

Page 3: ... 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 5 NOTES Take care that loose clothing ties ...

Page 4: ...damaged Also do not insert a screw driver or the similar into the exhaust port It is recommended to use Crankshaft Clamp 37 Code No 71530600 available as an optional tool 7 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 ...

Page 5: ...surplus fuel Cover the head with a rag to prevent pumped out fuel from getting into your eyes 9 F J J F 28 34 27 33 A B 9 0 9 0 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 throttl...

Page 6: ...silencer is the same as those of the 32SX H it can be directly replaced with the 32SX H and most of other 32 39 size engines This powerful engine is suitable for sport flight as well as 3D flight With some models needle interferes the body and working on the body to avoid this would be required Instruction manual 11 ENGINE PARTS NAME Needle Valve Fuel Inlet Mixture Control Valve Throttle Lever Rot...

Page 7: ...f both provided that they are always of top quality For consistent performance and long engine life it is essential to use fuel containing AT LEAST 18 lubricant by volume Some fuels containing coloring additives tend to deterriorate and may adversely affect running qualities If in doubt compare to a fuel known to be good Modelenginefuelispoisonous Donotallow it to come into contact with the eyes o...

Page 8: ...stortion within the engine itself probably resulting in loss of performance and internal damage The recommended screws for securing the engine to the engine mounts in the model are 3mm or 4 40 steel Allen type It is also advisable to use lock washers or LOCTITE to prevent nuts from loosening Front view CORRECT Side view Top surfaces are in the same plane Re align the surfaces as necessary INCORREC...

Page 9: ...tion is initiated by the application of a 1 5 volt power source When the battery is disconnected the heat retained within the combustion chamber remains sufficient to keep the plug filament glowing thereby continuing to keep the engine running Ignition timing is automatic under reduced load allowing higher rpm the plug becomes hotter and appropriately fires the fuel air charge earlier conversely a...

Page 10: ...ure Control Valve 19 REALIGNMENT OF MIXTURE CONTROL VALVE In the course of making carburetor adjustments it is just possible that the Mixture Control Valve may be inadvertently screwed in or out too far and thereby moved beyond its effective adjustment range Its basic setting can be reestablished as follows Mixture Control Valve Carburetor Body First rotate the Mixture Control Valve until its slot...

Page 11: ...employ for actual operation of your model STARTING 21 Close Open 1 2 3 Opening and closing of the Needle Valve Turn the needle clockwise to close the needle valve and turn the needle counter clockwise to open the needle valve as shown in the sketch Opening the needle valve Firstly turn the needle clockwise slowly until it stops The position it stops is the fully closed position of the needle valve...

Page 12: ...he throttle is fully closed when the throttle lever as well as trim lever on the transmitter are fully pulled down NOTE If the throttle response is poor or the engine stops due to a temporarily over rich mixture im mediately after the engine is started pinch the fuel line for one or two seconds until the engine r p m increase and the engine runs steadily Reminder Never touch or allow any object to...

Page 13: ...ed 25 lf at this time the engine is slow to pick up and produces an excess of exhaust smoke the mixture is too rich Correct this condition by turning the Mixture Control Valve clockwise lf the mixture is extremely 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 an e...

Page 14: ... within the range where idle reliability and high speed performance are not unduly compromised Readjustments should therefore be carried out as follows After about 10 seconds of idling open the throttle to float the model lf the transition is smooth the idle mixture is O K If the symptoms of either rich or Iean running are observed readjust the Mixture Control Screw accordingly K When satisfactory...

Page 15: ...tly cleaned to remove dirt and lint that accumulates on the filter screen Finally occasionally remove the needle valve holder from the carburetor as shown in Photo and extract any remaining foreign matter that may have lodged in the location shown in right Remove this with an 8mm spanner Dirt and fbrous matter mostly accumulate here 29 ADJUSTING CHART Open the Needle Valve 1 5 turns from the fully...

Page 16: ...m 31 Do not close the needle valve and mixture control valve too far as this will cause a lean setting and over heating of the engine This can in turn create nitromethane oxide leading to internal rusting of the engine Always adjust the needlevalve slightly on the rich side of peak rpm Do not leave unused fuel in the engine at the conclusion of a day s flying Accepted practice is to cut off the fu...

Page 17: ...Incorrect carburetor settings Return the needle valve and mixture control valve to basic position Incorrect servo linkage Reconnect linkage after setting servo at neutral Reverse rotating direction of electric starter Mare sure the engine rotates counter clockwise seen from crankshaft side 33 Symptom Cause Corrective action Engine fires intermittently but does not run Insufficient fuel in the tank...

Page 18: ...nected or disconnected Check the connections and secure them Fuel tubing from tank to is split or broken Replace the tubing 35 Symptom Cause Corrective action Symptom Cause Corrective action Poor response Deteriorated glowplug Replace glowplug Incorrect carburetor settings Readjust low r p m range with metering needle and mixture control valve Poor r p m drop Too much throttle opening at idle Lowe...

Page 19: ...8 9 10 11 12 13 14 15 16 17 Heatsink Head Cylinder Liner Piston Ring Piston Piston Pin Piston Pin Retainer 2pcs Connecting Rod Carburetor Complete 20M Propeller Nut Thrust Washer Crankshaft Bearing Front Crankcase Crankshaft Bearing Rear Crankshaft Gasket Set Cover Plate Screw Set Throttle Lever Assembly Glow Plug No 8 No Description Code No 23414300 23413100 25403400 23413200 23406000 24517000 23...

Page 20: ...bly 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 Spring Fuel Inlet w Gasket Mixture Control Valve Assembly O Ring L 2pcs O Ring S 2pcs Carburetor Rubber Gasket Carburetor Retaining Screw 2pcs 1 1 1 2 3 4 5 5 1 5 2 5 3 5 4 5 5 5 6 6 6 1 6 2 7 8 2908514...

Page 21: ...71530600 37 SUPER FILTER DRIVE HUB CRANKSHAFT CLAMP 23408000 55500002 M3 LOCK WASHER 10set M2 6x7 CAP SCREW SET 10pcs 79871020 41 THREE VIEW DRAWING Displacement Bore Stroke Practical R P M Power output Weight SPECIFICATIONS Dimensions mm JAPAN 45 42 30 6 18 38 7 57 5 JAPAN 45 9 21 3 61 15 8 30 8 35 50 1 4 28UNF 6 07 cc 0 370 cu in 20 5mm 0 806 in 18 4mm 0 725 in 2 000 21 000 r p m 1 4 ps 1 42 hp ...

Page 22: ...right 2004 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 60091520 061106 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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