O.S. engine Sirius 7 Manual
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O.S. engine Sirius 7 Manual

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It is of vital importance, before attempting to
operate your engine,
'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.
 
to read the general
2-4
5
6
14-15
16
Seven-cylinder radial
overhead-valve four-stroke engine
7-8
9-10
11
ENGINE PARTS LIST
12
CARBURETOR EXPLODED VIEW
13
ENGINE THREE VIEW DRAWINGS
17-18
1
CONTENTS
19-21
22
23-25
26-27
28-29
30
31
32
33
34

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Summary of Contents for O.S. engine Sirius 7

  • Page 1: Table Of Contents

    CONTENTS SAFETY INSTRUCTIONS AND 19-21 WARNINGS ABOUT YOUR O.S. ENGINE STARTING NOTES WHEN APPLYING AN RUNNING-IN ("Breaking-in") ELECTRIC STARTER THROTTLE VALVE ADJUSTMENT 23-25  ...

  • Page 2: Safety Instructions And Warnings About Your O.s. Engine

    (see 'NOTES' all times. section relating to propeller safety). If at some future date, your O.S. engine is acquired by another person, we would respectfully request that these Model engine fuel is poisonous. Do not allow it to instructions are also passed on to its new owner.

  • Page 3: Notes When Applying An Electric Starter

    NOTES 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.

  • Page 4: About The Engine

    ABOUT THE ENGINE The FR7-420 (Sirius7) is a seven-cylinder radial STANDARD ACCESSORIES overhead-valve four-stroke-cycle engine of 70cc displacement. The engine maintains the same Needle-Valve Extension Cable Set features of stress free starting, super smooth idling and high torque power which is always the hallmark of O.S.

  • Page 5: Installation

    Intake Pipe Rocker Cover Cylinder Head Back Plate Exhaust Pipe Carburetor Type 80T INSTALLATION Needle-valve extension It is essential that the firewall is strong and rigid (e.g. at least 15mm thick) and firmly integrated with the structure of The needle-valve supplied with this engine is designed to the aircraft.

  • Page 6: Fuel Tank & Lines

    Carburetor cleanliness Exhaust pipe Exhaust pipe becomes very hot while running and right It is recommended that the fuel is passed through a filter after running, make sure it does not touch the model and when the tank is filled and that a good in-line filter is never allow hand and body to touch it.

  • Page 7: Glowplug

    GLOWPLUG Since the compatibility of the glowplug and Glowplug life fuel may have a marked effect on Particularly in the case of very high performance engines, performance and reliability, it is suggested glowplugs must be regarded as expendable items. However, to use the O.S.

  • Page 8: Propeller

    PROPELLER The choice of propeller depends on the design and weight of PROPELLER & SPINNER ATTACHMENT the aircraft and on the type of flying in which you will be There is a risk, particularly with powerful four-stroke engines, engaged. Determine the best size and type after practical of the propeller flying off if the prop nut loosens due to experimentation.

  • Page 9: Glowplug Heating

    GLOWPLUG HEATING Glowplug battery Glowplug leads The engine uses seven plugs (O.S. Type F). Make sure that no part of the wiring touches any part of the It is suggested to use a commercially available glowplug engine, or the wire covering may be melted which causes heater intended for multi-cylinder engines.

  • Page 10: Starting

    Reminder! Lubrication Model engine fuel is poisonous. Do not allow it to The crankcase breather hole is located at the back of the come into contact with the eyes or mouth. Always engine and is fitted with a brass nipple. Fit a length of silicone store it in a clearly marked container and out of the tubing of approx.
  • Page 11 Now disconnect the glowplug battery. Starting with an electric starter. Make sure that the direction of rotation of the starter is Adjust the needle-valve correct. With fully throttle, close the needle-valve gradually to increase Connect the glowplug battery. the engine rpm. It is suggested to use a tachometer. Apply the electric starter.

  • Page 12: Running-In ("Breaking-In")

    RUNNING-IN ("Breaking-in") Obtain an 22x10 or 23x8 propeller for running-in. 1. Running-in on the ground 2. Running-in in the air Start the engine Start the engine ↓  Fly the model. Set the needle-valve approx 45 open from optimum position (approx. 45 open from Set the needle-valve 200-300r.p.m.
  • Page 13 Adjusting the mixture control valve NOTE: As this is a seven-cylinder four-stroke-cycle engine, If the engine hesitates, puffing Mixture Control Valve seven firings take place every two complete revolutions. out a good deal of smoke, before Therefore, at first you may have an impression that the picking up to full speed, it is Turn 30 engine is idling at higher r.p.m.

  • Page 14: Flight & Maintenance

    FLIGHT & MAINTENANCE Checking before flight Install a fuel filter to prevent dirt and dust in the fuel Make sure that all seven cylinders are firing. container from entering the fuel tank. O.S. Super Filters (L) Sound at full throttle changes when one or two cylinders are is available as an optional extra.

  • Page 15: Valve Clearance Adjustment

    VALVE CLEARANCE ADJUSTMENT ALL O.S. four-stroke engines have their valve (tappet) The standard valve clearance, on both inlet and exhaust clearances correctly set before they leave the factory. valves, is between 0.04mm and 0.1mm(0.0015-0.004 inch), However, if, after many hours of running time have been measured between valve stem and rocker arm.

  • Page 16: Engine Exploded View

    ENGINE EXPLODED VIEW & PARTS LIST C.M2.6x10 C.M3.5x18 C.M3.5x8 C.M2.6x7 C.M3.5x15 N.+M3x22 20-1 C.M3x8 M2.6x13.1 C.M4x10 C.M2.6x13 C.M2.6x7 20-2 52-1 C.M4x15 C.M4x25 C.M4x15 C.M4x25 CAP SCREW SETS (10pcs./sets) Size Code No. Size Code No. M2.6x7 M3.5x15 79871020 79871090 M2.6x10 79871098 M3.5x18 79871030 M3x8...

  • Page 17: Parts List

    EXPLODED VIEW & PARTS LIST S.M3x3 Code No. Description 47181970 Needle Assembly 27381940 Needle Holder Assembly 26711305 Ratchet Spring 47181100 Carburetor Body 22681953 Fuel Inlet (Nipple No.1) 46115000 Carburetor Rubber Gasket 45581820 Roter Guide Screw 47181600 Mixture Control Valve Assembly  ...
  • Page 18 THREE VIEW DRAWING Specifications Displacement 9.95 cc x 7 / 0.607 cu.in. x 7 24.0 mm / 0.945 in. Bore Stroke 22.0 mm / 0.866 in. 1,500-7,000r.p.m. PracticalR.P.M. Output Weight 3,167 g / 111.71 oz. UNF3/8-24 158.5 Dimensions (mm) 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL.

This manual is also suitable for:

Fr7-420

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