User Manual

ManualsBrandsOS Engines ManualsAirplanesFF-320 Pegasus 4-Cylinder Ringed 4-Stroke Engine

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

2-4

6-7

8-9

10-11

13-14

14-18

18-19

19-21



23-25

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 content (17 pages)

PAGE 1
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.
PAGE 2
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE WARNINGS Never touch, or allow any object to come into contact with, the rotating propeller and do not crouch over the engine when it is running. 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 or abused. As owner, you, alone, are responsible for the safe operation of your engine, so act with discretion and care at all times.
PAGE 3
NOTES Use an electric starter for this engine. The wearing of safety glasses is also strongly recommended. Take care that the glow plug clip or battery leads do not come into contact with the propeller. Also check the linkage to the throttle arm. A disconnected linkage could also foul the propeller. After starting the engine, carry out any needle-valve readjustments from a safe position behind the rotating propeller. Stop the engine before attempting to make other adjustments to the carburetor.
PAGE 4
ENGINE PARTS NAME Photo. 2 No.1 Cylinder Crankcase No.3 Cylinder No.2 Cylinder Lock Nut Propeller Nut No.4 Cylinder Propeller Washer Front Housing 6 Choke Valve Photo.
PAGE 5
INSTALLATION The FF-320 is equipped with a strong cast aluminum radialtype mount to enable it to be bolted securely to the firewall (front bulkhead) of the aircraft. Needle-valve extension The needle-valve with this engine is designed to incorporate an extension so that, when the engine is enclosed within the fuselage, the needle-valve may be adjusted from the outside. An L-shaped rod, of 1.6-1.8mm dia.
PAGE 6
PROPELLER The choice of propeller depends on the design and weight of the aircraft and on the type of flying in which you will be engaged. Determine the best size and type after practical experimentation. As a starting point, refer to the props listed in the accompanying table.
PAGE 7
GLOWPLUGS The FF-320 is supplied with an O.S. Type F glowplug, specially designed for O.S. four-stroke engines. When to replace the glowplug Apart from when actually burned out, a plug may need to be replaced because it no longer delivers its best performance, such as when: Filament surface has roughened and turned white. The role of the glowplug With a glowplug engine, ignition is initiated by the application of a 1.5-volt power source.
PAGE 8
Glowplug leads The plug leads are fitted with special snap-on connectors that ensure firm contact with O.S. plug. They are a "click" fit and are not suitable for use with most other makes of glowplug. Glowplug re-heat Under normal conditions, the FF-320 will idle sufficiently slowly with the throttle closed to permit a safe landing approach. However, if conditions (atmospheric, fuel, tank location etc.
PAGE 9
Excess fuel in the carburetor may drip into the engine compartment when the choke valve is reopened. Therefore, it is advisable to drill a drain hole in the bottom of the engine bay or cowling and to apply fuelproof paint to the surrounding surfaces to prevent fuel from penetrating the airframe structure. 3. Open the throttle valve fully, close the choke valve and turn the propeller counter-clockwise through three revolutions. (Fig.19 & 20) Fig.20 Fig.19 Open the throttle fully. 4.
PAGE 10
. Adjust the needle-valve RUNNING-IN ("Breaking-in") Abrupt adjustment of the needle-valve may cause the engine to stop, especially when it is new and insufficiently run-in. Obtain an 18x12 or 20x8 propeller for running-in. 1. Running-in on the ground 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.
PAGE 11
Start the engine. open the throttle fully . Adjust the needle-valve. Disconnect the glowplugs from the battery. Approx 40˚ open from maximum r.p.m. setting. Make sure that all 4 cylinders are firing. Close the throttle gradually. Set the idle speed. Re-set the idle speed a little higher Open the throttle fully. Engine stops. Does the engine regain full power? The position where the lowest possible r.p.m. ,with steady running, is obtained.
PAGE 12
Adjusting the mixture control valve of the + mark about 1/12 turn (30 ). Normal safe idle speeds are in the region of 2,000 r.p.m.. 1. If the engine hesitates, puffing out Mixture Control Screw a good deal of smoke, before picking up to full speed, it is Turn 30 probable that the idle mixture is too rich. In this case, it will be necessary Screwdriver to turn the Mixture Control Screw Fig.29 in the reverse direction from the + mark (i.e. clockwise) to lean the mixture.
PAGE 13
VALVE CLEARANCE ADJUSTMENT ALL O.S. four-stroke engines have their valve (tappet) clearances correctly set before they leave the factory. However, if, after many hours of running time have been logged, a loss of power is detected, or if the engine has to be disassembled or repaired as a result of an accident, valve clearances should be checked and readjusted, as necessary, with the aid of the O.S. Valve Adjusting Tool Kit. 2.
PAGE 14
4. Re-tighten locknut while holding adjusting screw stationary. (Fig.38.) Hold at the screw head. Tighten Locknut. Fig.38 5. Remove 0.04mm feeler, rotate prop through two revolutions and recheck gap. 6. If clearance is correct, loosen the locknut on the other rocker-arm and repeat steps 1 to 5 above. Finally, replace rocker box cover. Remember: Excessive valve clearance will cause loss of power, due to valve (s) not opening sufficiently.
PAGE 15
EXPLODED VIEW 39 38 41 40 26 38 26-1 35 38 C.M3.5x12 C.M3x16 37 1 36 43 C.M4x22 42 30 1 28 25 34 C.M3.5x10 33 8 31 32 20 24 7 29 27 12-3 C.M3.5x12 12 23 17 6 22 6-1 15 21 12-2 1 6-2 19 18 16-2 16-1 16-3 12-1 C.M2.6x8 M3 13-3 13-2 16 13 14 11 3-1 3-2 5-3 5-2 13-1 11-2 11-1 11-2 6-3 6-4 3 C.M3.5x15 5 1 C.M3x15 5-1 4-1 4-2 N.+M3x22 4 C.M3x8 C.M3.5x20 2 11-3 C.M2.6x7 10 Type of screw C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...
PAGE 16
CARBURETOR EXPLODED VIEWS & PARTS LIST No. Code No. 1 2 2-1 3 3-1 4 4-1 5 6 7 7-1 8 9 9-1 9-2 9-3 9-4 9-5 9-6 9-7 10 10-1 10-2 11 26381501 24981405 26381501 46481320 22781800 46481330 26381501 46481200 46281340 46481310 22781800 46481100 46281900 29081952 24981837 26381501 46181940 46181941 46181950 26711305 26781619 26681305 26681803 45581700 S.M3x3 1 2 5 6 2-1 3-1 S.M3x3 3 4-1 S.M3x3 4 8 7-1 7 10-1 10-2 S.M3x3 10 9-6 9-5 9-7 9-2 9-4 11 9-3 9-1 N.
PAGE 17
THREE VIEW DRAWING 63.5 13,26cc x 4 / 0.809cu.in. x 4 27,7mm / 1.091in. 22,0mm / 0.866in. 1,800-8,500r.p.m. 62 2,190g / 77.3oz. 62 Displacement Bore Stroke PracticalR.P.M. Output Weight 50.5 Specifications 4- 5.2 181.5 76 56.5 23.5 196 68 70 Dimensions(mm) 30 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 URL : http://www.os-engines.co.jp C Copyright 2005 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.