background image

18

Adjust the needle-valve

10.

Abrupt adjustment of the needle-valve may cause the 
engine to stop, especially when it is new and insufficiently 
run-in.

As the speed of the engine does not instantly change with 
needle-valve readjustment, small movements, with pauses 
between, are necessary to arrive at the optimum setting.

Practical best (optimum) needle-valve setting

Fig.24

Approx. 40

Maximum rpm setting 
("Lean")

"Rich" needle-valbe setting
when starting the engine.

Revolutions start to decrease.

Close the needle-valve
gradually and slowly.

Engine stops.

Re-starting the engine when warm

To re-start the engine when warm, simply re-energise the 
plugs and reapply the starter with the throttle in the idling 
position. If the engine does not start, disconnect the battery 
from the glowplugs and re-prime by closing the choke valve 
while rotating the propeller twice with the throttle open. 
Initially, the high temperature inside the combustion chambers 
may turn the liquid fuel into gas and emit it through the 
exhaust pipes. Therefore, repeat the priming procedure once 
or twice until the cylinders become cool enough for restarting.

RUNNING-IN ("Breaking-in")

Obtain a 18x6 propeller for running-in.

1

2

1. Running-in on the ground

Start the engine

Set the needle-valve at 500-1,000r.p.m. lower than 
maximum r.p.m. setting and run approx, 10 seconds. 
(It is suggested to use a tachometer.) 

Open the needle-valve at approx. 1,000r.p.m. lower 
than above setting and run approx. 20 seconds.

Repeat above procedure, while increasing the setting 1 r.p.m. 
gradually, for approx. 10 minutes.

Keep the throttle fully open, using only the needle-valve to 
change r.p.m. Prolonged running-in on the ground is not 
suggested because the purpose is just initial running-in 
to increace engine temperature gradually close to that of 
maximam r.p.m.

NOTE:

19

THROTTLE VALVE ADJUSTMENT

Photo. 5

Needle-valve

Fuel inlet

Choke valve

Mixture control screw

Throttle stop screw

2. Running-in in the air

Start the engine

Set the needle-valve approx 40  open from optimum 
position (approx. 40  open from maximum r.p.m.).

Fly the model.

NOTE: Avoid prolonged heavy load flight.

With each successive flight, close the needle-valve 
slightly, until, at the end of 10 flight, the needle-valve is 
set for optimum position.

Finish running-in.

The carburetor can now be adjusted for optimum throttle 
performance following the instructions given in the next 
section.

Needle-valve adjustment

Adjust the needle-valve following the instructions given in 
STARTING section.

Mixture control valve adjustment

After running is completed and the needle-valve is set at 
optimum position (approx 40  open from maximum r.p.m. 
position), check the idling running and adjust only when 
necessary. 

Summary of Contents for FT-160

Page 1: ...s supplied with the aircraft radio control equipment etc are accessible for checking at the same time Horizontally opposed twin cylinder overhead valve four stroke cycle 1 2 4 5 6 7 8 10 10 11 12 13 14 15 18 18 19 19 21 22 22 23 25 26 27 28 29 30 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE INTRODUCTION TOOLS AND ACCESSORIES ENGINE PARTS NAME INSTALLATION PROPELLER FUEL TANK GLOWPLUGS GL...

Page 2: ...de 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 head or exhaust header pipe in particular may result in a serious burn 3 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...

Page 3: ...ne running be especially cautious Keep the propeller pointed away from you and walk well clear of spectators Warning Immediately after a glowplug ignition engine has been run and is still warm conditions sometimes exist whereby it is just possible for the engine to abruptly restart if the propeller is casually flipped over compression WITHOUT the glowplug battery being reconnected Remember this if...

Page 4: ...e Carburetor Exhaust Pipe Propeller Nut Cylinder Head Left No 1 Cylinder Right No 2 Cylinder Photo 2 Aluminum tube Aluminum tube is not supplied with the engine 7 Push Rod Cover Choke Valve Intake Pipe Left Photo 3 Fuel Inlet Intake Pipe Right Rear Housing Intake Manifold Breather Nipple ...

Page 5: ...t by reversing the hexagon nut nd cap screw Unscrew the cap screw while holding the hexagon nut with 6mm wrench and re fit the lever to required location If the rod is too long reduce it to required length A needlessly lengthy rod may vibrete The rod should be as short as possible or have its outer end supported Fig 3 Set screw Choke lever Hex nut Cap screw Choke rubber pad Fuel inlet The fuel inl...

Page 6: ...mly after retightening the propeller nut NOTE 11 Ream the propeller shaft hole to 12mm bore with an appropriate reamer checking that the hole is exactly centered Install the prop to the engine shaft followed by the retaining washer and prop nut and tighten firmly with a 17mm wrench not supplied 1 2 3 Add the special tapered and slotted locknut and secure with a 12mm wrench while holding the prop n...

Page 7: ... to a conveniently located common external point on the fuselage This can either be a terminal with a separate terminal for the earth ground lead Fig 10 or a suitable socket or jack with connections for both glowplug and earth ground leads Fig 11 Note that the earth ground lead supplied is much heavier 2 0 mm multi strand copper core than the plug leads as this has to have the capacity to carry th...

Page 8: ...ways 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 Reminder Fuel The FT 160 should be operated on a methanol based fuel containing not less than 18 volumetric castor oil or a t...

Page 9: ...l from penetrating the airframe structure Release the choke control and immediately turn the propeller c o u n t e r c l o c k w i s e several times so that fuel is drawn well into the cylinders Fig 19 4 Fig 19 17 Set the throttle valve approximately 1 4 open from the fully closed position Fig 20 5 Fig 20 Fully open Fully closed Set at this position Starting with an electric starter Fig 21 6 Fig 2...

Page 10: ...valve at 500 1 000r p m lower than maximum r p m setting and run approx 10 seconds It is suggested to use a tachometer Open the needle valve at approx 1 000r p m lower than above setting and run approx 20 seconds Repeat above procedure while increasing the setting 1 r p m gradually for approx 10 minutes Keep the throttle fully open using only the needle valve to change r p m Prolonged running in o...

Page 11: ...ngine stopping is obtained The position where the lowest possible r p m with steady running is obtained Approx 40 open from maximum r p m setting Yes No Yes Engine stops Engine stops Disconnect the glowplugs from the battery Make sure that all 2 cylinders are firing Make sure glowplug heat is switched The engine hesitates before picking up to full speed or appears to run at medium speed with reduc...

Page 12: ...ated at the centre The pin is seen if the throttle lever is removed mark Throttle lever Carefully turn the screw in the direction of the mark with the screw driver supplied until it stops then turn back again exactly two revolutions NOTE If an on board glowplug re heat system is fitted mixture adjustment at idling speed should be carried out with this in operation 22 FLIGHT It is necessary to warm...

Page 13: ...point both valves should be closed If the prop driver drive hub of your engine is engraved with a letter T this mark should now be at the top The standard valve clearance on both inlet and exhaust valves is between 0 04mm and 0 1mm 0 0015 0 004 inch measured between valve stem and rocker arm Use the 0 04mm and 0 1mm feeler gauges to check clearances See Fig 29 Fig 29 0 04mm Feeler Gauge Rocker Arm...

Page 14: ... replace rocker box cover 6 Remember Excessive valve clearance will cause loss of power due to valve s not opening sufficiently On the other hand a total loss of clearance may cause difficult starting due to valves not closing properly resulting in loss of compression Re tighten locknut while holding adjusting screw stationary Fig 33 4 Hold at the screw head Fig 33 Tighten Locknut ...

Page 15: ...3 13 1 13 2 14 15 16 16 1 16 2 16 3 17 18 19 20 21 22 23 24 25 26 27 28 29 29 1 30 31 32 33 34 35 36 37 38 39 Description Code No No Description Code No No Screw Set Rocker Cover Rocker Support Assembly Rocker Support Rocker Arm Retainer 2pcs Rocker Arm Assembly 1pair Rocker Arm 1pc Tappet Adjusting Screw Exhaust Pipe Assembly Exhaust Pipe Exhaust Pipe Lock Nut Valve Assembly 1pair Valve 1pc Valve...

Page 16: ... choke valve assembly is not included in the carburettor complete Type of screw C Cap Screw M Oval Fillister Head Screw F Flat Head Screw N Round Head Screw S Set Screw CARBURETOR EXPLODED VIEWS PARTS LIST The specifications are subject to alteration for improvement without notice N M3x22 S M3x3 S M3x3 S M3x3 S M3x3 1 2 2 1 3 1 3 4 1 4 5 6 7 7 1 8 10 10 1 10 2 11 9 9 1 9 3 9 2 9 4 9 6 9 5 9 7 29 R...

Page 17: ...120 76 THREE VIEW DRAWING Dimensions mm Specifications Displacement Bore Stroke PracticalR P M Output Weight C Copyright 2004 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 60090531 040501 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 ...

Reviews: