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It is of vital importance, before attempting 
to operate your engine,  to read the 
general  'SAFETY INSTRUCTIONS AND 
WARNINGS'  
section on pages 2-4 of this 
booklet and to strictly adhere to the advice 
contained 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 aircraft, radio control equipment, 
etc., are accessible for checking at the same 
time.

Horizontally-opposed four-cylinder
overhead-valve four-stroke-cycle

1

2-4

5

6-7

8-9

10-11

12

13-14

14-18

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

GLOWPLUGS 

GLOWPLUG HEATING 

FUEL AND LUBRICATION, STARTING

RUNNING-IN ("Breaking-in")

THROTTLE VALVE ADJUSTMENT

CONTENTS

FLIGHT

CARE AND MAINTENANCE 

VALVE  CLEARANCE ADJUSTMENT

ENGINE EXPLODED VIEW 

ENGINE PARTS LIST

CARBURETOR EXPLODED VIEW

 &

PARTS LIST

O.S. GENUINE PARTS & ACCESSORIES

ENGINE THREE VIEW DRAWINGS

Summary of Contents for PEGASUS 320

Page 1: ...uctions supplied with the aircraft radio control equipment etc are accessible for checking at the same time Horizontally opposed four cylinder overhead valve four stroke cycle 1 2 4 5 6 7 8 9 10 11 12...

Page 2: ...e 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 head...

Page 3: ...ing 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 som...

Page 4: ...Crankcase Propeller Nut No 1 Cylinder Photo 2 No 2 Cylinder No 3 Cylinder No 4 Cylinder Front Housing 7 Rocker Cover Rear Housing Carburetor Exhaust Pipe Cylinder Head Photo 3 Drain Nipple Breather N...

Page 5: ...9 Choke valve The choke valve operating lever can be located rught or left by reversing the hexagon nut and cap screw Unscrew the cap screw while holding the hexagon nut with 6mm wrench and re fit th...

Page 6: ...ean or under an excessively heavy load Obviously this can be very hazardous To eliminate such dangers the O S Safety Locknut Assembly was devised Install this as follows To be equal To be equal Ream t...

Page 7: ...conveniently located common external point on the fuselage This can either be a terminal with a separate terminal for the earth ground lead Fig 12 or a suitable socket or jack with connections for bot...

Page 8: ...moke or allow anyone else to smoke near to it Reminder Fuel The FF 320 should be operated on a methanol based fuel containing not less than 18 volumetric castor oil or a top quality synthetic lubrican...

Page 9: ...tely turn the propeller counter clockwise several times so that fuel is drawn well into the cylinders Fig 22 4 Fig 22 Set the throttle valve approximately 1 4 open from the fully closed position Fig 2...

Page 10: ...seconds Repeat above procedure i e richening and leaning the mixture until the engine has approx 10 minutes of running time Keep the throttle fully open using only the needle valve to change r p m Pr...

Page 11: ...tained 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 bat...

Page 12: ...e 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 turns NOTE If an on board gl...

Page 13: ...this 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 exhaus...

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...

Page 15: ...5115000 46115000 46468110 46168100 45169200 46468300 46468200 46168210 45169200 46468300 46168500 45566000 45566100 Screw Set Rocker Cover Rocker Support Assembly Rocker Support Rocker Arm Retainer 2p...

Page 16: ...le Lever Assembly Set screw Mixture Control Screw Assembly O Ring 2pcs Mixture Control Screw Holder Assembly Set screw Carburetor Rotor Mixture Control Valve Pin Mixture Control Valve Assembly O Ring...

Page 17: ...5 6 8 76 Dimensions mm THREE VIEW DRAWING Specifications Displacement Bore Stroke PracticalR P M Output Weight C Copyright 2005 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 60090560...

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