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14

FACTS ABOUT GLOWPLUGS

The role of the glowplug

Glowplug life

Particularly in the case of very high performance 
engines, glowplugs must be regarded as expendable 
items. 

With a glowplug engine, ignition 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, 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, A5 and A3. Carefully install plug finger-tight, 
before final tightening with the correct size plug 
wrench.

Install a plug suitable for the engine.

Use fuel containing a moderate percentage of 
nitromethane. 

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 as when:

When to replace the glowplug

Filament surface has roughened and turned white. 

Filament coil has become distorted.

Foreign matter has adhered to filament or plug 

body has corroded.

Engine tends to cut out when idling.

Starting qualities deteriorate.

15

INSTALLING
THE GLOWPLUG

Install washer on glowplug and insert carefully into 
Heatsink-head, making sure that it is not cross-
threaded before tightening firmly. 

Glow plug

Washer

INSTALLATION OF THE ENGINE

The under-surfaces of all O.S. engine beam 
mounting lugs are precision machined flat and 
exactyly parallel to the engine's horizontal axis. It is 
essential that the engine mounts in the model are 
also accurately made and aligned. If they are not, 
they will cause stress and distortion 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.

With some models, needle interferes the body 

and working on the body to avoid this would be 

required.

NOTE:

Содержание MaX-37SZ-HRING

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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