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O.S. Engine FS-26S Owner's Instruction Manual

Manual is about: Four cycle engine FS-40S; FS-26S

Summary of FS-26S

  • Page 1

    It is of vital importance, before attempting to operate your engine, to read the general 'safety instructions and warnings' section on pages 2-6 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 famil...

  • Page 2: Contents

    2 ~ 6 7 8 9 11 ~ 12 13 ~ 14 15 ~ 21 21 27 ~ 29 30 31 10 12 safety instructions and warnings about your o.S. Engine introduction,basic engine parts installation installation of choke rod, needle valve extension, exhaust pipe adjustment(fs-26s) silencer, linkage of throttle lever before starting fuel ...

  • Page 3: Warnings

    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. As owner, you, alone, are responsible for the safe operation of your engine, so act with discretion and care at all times. If at some futu...

  • Page 4: Warnings

    Warnings model engine fuel is poisonous. Do not allow it to come into contact with the eyes or mouth. Always store it in a clearly marked container and out of the reach of children. Never operate your engine in an en- closed space. Model engines, like auto- mobile engines, exhaust deadly carbon- mon...

  • Page 5: Notes

    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 the manufacturers' recommenda- tions, using appropriate screws and lock- nuts. Be sure to use the silencer (muffler) supplied with the engin...

  • Page 6: Notes

    Notes • • always check the tightness of the propeller nut and retighten it, if necessary, before restarting the engine, particularly in the case of four-stroke-cycle engines. If a safety locknut assembly is provided with your engine, always use it. This will prevent the propeller from flying off in ...

  • Page 7: Notes

    Notes • • • • • adjust the throttle linkage so that the engine stops when the throttle stick and trim lever on the transmitter are fully retarded. Alternatively, the engine may be stopped by cutting off the fuel supply. Never try to stop the engine physically. Take care that loose clothing (ties, sh...

  • Page 8: Basic Engine Parts

    •silencer body •choke rod •silicone tubing fs-26s fs-40s installing the glowplug carburetor install washer on glowplug and insert carefully into cylinder- head, making sure that it is not cross-threaded before tightening firmly. Basic engine parts the fs series engines are up-to-date overhead-valve ...

  • Page 9: Installation

    Installation how to fasten the mounting screws. Hardwood mounting beams o.S. Radial motor mount (cast aluminum) tighten second nut firmly down onto first nut. Tighten this nut first. Steel washer 3.5mm steel nuts for fs-40s spring washer or lock washer hardwood such as cherry or maple. Spring washer...

  • Page 10: Installation of Choke Rod

    The fs series engines are equipped with self- reopening choke valves. Cut the choke rod (supplied) to the length indicated, then secire the rod by tightening the set screw, using 1.5mm allen wrench (supplied), after installing the engine. Installation of choke rod choke rod 1.5mm allen key set-screw...

  • Page 11: Silencer

    Silencer the fs-26s and fs-40s are supplied with silencers as standard equipment. Installation for fs-26s slide the silencer over the exhaust pipe, and secure it with two set-screwssupplied with the silencer. Re- check tightness of screws when engine is hot. Installation for fs-40s screw the exhaust...

  • Page 12

    4 glowplug battery the power source for heating the glowplug may be either a large heavy-duty 1.5volt dry cell, or preferably, a 2-volt rechargeable lead-acid cell (accumulator). 1.5 volt heavy-duty dry battery or 2 volt rechargeable lead-acid cell (at least 5ah) if a 2-volt cell is employed, use a ...

  • Page 13: Fuel And Pressure Lines

    Fuel can filter 3 11 silicone tubing this is required for the connection between the fuel tank and engine. 10 fuel can filter install a filter in the outlet line of your refuelling container to prevent entry of foreign matter into the fuel tank. (refer to of starting the engine section.) 9 electric ...

  • Page 14

    Fuel use a good quality commercial fuel or one of the blends shown in the table. Fuel "a" is suitable for running-in and ordinary use. Fuel "b" is for use when more power is required and for improved flexibility. Note that even a small quantity of nitromethane (3-5%) will improve flexibility, making...

  • Page 15

    9x6 ~ 7 fs-26s trainer & sport 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. Sport & aerobatic reminder! Glowplug the fs-26s and fs-40s are supplied with an o.S. Type f glowplug, specially designed for o.S. Fo...

  • Page 16: Starting The Engine

    Starting the engine preparations 1 installing the glowplug install the washer on the glowplug and screw carefully into cylinder-head, making sure that it is not cross-threaded before tightening firmly. Washer glow plug 2 installing the propeller there is a risk, particularly with four-stroke engines...

  • Page 17

    Close open 4 opening and closing of the needle-valve turn needle-valve clockwise to close (for leaner mixture). Turn needle-valve counter-clockwise to open (for richer mixture). Starting turn the needle-valve in the direction of arrow slowly, without forcing, until it stops. 5 setting the needle-val...

  • Page 18

    8 hold model securely when starting 9 setting the throttle 10 heat glowplug starter assistant should hold the model so that it cannot move forward when the engine starts. Be careful not to be hit by propeller! Fully opened position fully closed position set at this position. Starting battery connect...

  • Page 19

    Check that the throttle is one-third open from the fully closed position. Bring the starter into contact with the spinner nut or spinner and depress the starter switch for one or two seconds. Repeat if necessary. When the engine fires, withdraw the starter immediately. Attention: never place your fi...

  • Page 20

    20 ~ 30 ° 15 needle-valve adjustment(2) as the needle-valve is closed beyond the initial readjustment, the rpm of the engine will be increased and a continuous high- pitched exhaust note, only, will be heard. Key to the needle-valve adjustment. (turn 15-30˚ at a time.) turn the needle-valve 15-30˚ i...

  • Page 21

    On starting from cold, with the needle-valve set at the rich starting position: take note of this position of the needle-valve. This will produce the practical best (i.E. Optimum)rpm setting (lower than maximum rpm). A light grey exhaust emission may be observed. Now, re-open needle-valve 20-30 ° ma...

  • Page 22: Running-In ("breaking-In")

    17 how to stop the engine close the throttle to reduce to the lowest possible r.P.M. Close with the transmitter throttle trim lever fully retarded, adjust the throttle servo linkage so that the throttle rotor is fully closed (i.E.Engine stopped) when the stick is fully retarded. All internal-combust...

  • Page 23: Carburettor

    These engines are equipped with a throttle type car- burettor which provides a wide range of engine speed control. With the throttle lever linked to a suitable servo in the model, movement of the throttle control on the transmitter will enable engine to be varied, proportionally, from idling speed t...

  • Page 24

    Start the engine. Make sure that the throttle is fully open. Adjust the neede-valve. Close the throttle gradually. Find the idling position. Fix the idling position. Open the throttle fully. Does the engine regain full power? Continue running at high speed for 10 seconds. Close the throttle. Run at ...

  • Page 25

    Carburettor air-bleed adjustment start engine and adjust needle- valve as previously described. Close the throttle gradually. Find the idling position. Approx. 15 ˚ hold the model. Hold model level, then slowly raise its nose. If rpm increases. If engine runs unevenly or stops. Approx. 15 ˚ immediat...

  • Page 26

    Symptom factor cause corrective action recharge the electric starter battery. Recharge lead-acid cell or replace dry battery. (note: an unused, or almost unused, dry battery may sometimes be of insufficient capacity if it is "old stock".) replace glowplug. Check that applied voltage is not too high....

  • Page 27

    Symptom factor cause corrective action voltage too high or too low. Re-check and readjust referring to "before starting" paragraph 4. Continue flipping propeller. If engine does not start after more than 10 flips, disconnect battery from glowplug and leave for a few minutes, then re- energize plug a...

  • Page 28: Valve Adjusting

    Valve adjusting 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, v...

  • Page 29

    Note: if the gap is found to be less than 0.04mm, it is not necessary to readjust the clearance if the engine has good compression and starts easily. Equally, if the gap exceeds 0.10mm but is not more than 0.14mm (i.E. The thickness of both feeler gauges inserted together), it is not necessary to re...

  • Page 30

    3. Fig.4 insert 0.04mm feeler gauge between valve stem and rocker-arm and gently turn adjusting screw clockwise until it stops.(fig.4.) 0.04mm feeler gauge turn with fingers until it stops. Re-tighten locknut while holding adjusting screw stationary. (fig.5.) 4. Hold at the screw head. Fig.5 tighten...

  • Page 31: Care and Maintenance

    Care and maintenance to ensure that you obtain long life and peak performance from your engine, observe the following. Avoid running the engine under dusty conditions. If necessary, lay a sheet of plywood or hard-board in front and under the nose of the model when starting the engine. Foreign matter...

  • Page 32: Fs-26S/fs-40S

    6.49 cc (0.396 cu.In.) 21.2mm (0.835 in.) 18.4mm (0.724 in.) 2,200 ~ 12,000 r.P.M. 0.65 bhp / 12,000 r.P.M. 355g (12.5 oz.) fs-40s 4.41 cc (0.269 cu.In.) 18.5mm (0.728 in.) 16.4mm (0.648 in.) 2,200 ~ 12,000 r.P.M. 0.41 bhp / 11,000 r.P.M. 268g (9.45 oz.) ■ ■ ■ ■ ■ ■ fs-26s ( )-fs-40s fs-26s/fs-40s t...

  • Page 33: Fs-26S Engine Exploded View

    - 0 9 c.M2.6x7 8 c.M2.6x18 c.M2.6x12 c.M2.6x7 c.M2.6x7 \ a s d f y t r e w q = 7 4 3 2 1 5 -4 5 -3 5 -2 4 -1 4 -2 3 -2 3 -1 5 6 \ -1 \ -2 [ \ -2 5 -1 i u o p ] 8 -1 y -1 g fs-26s engine exploded view ✽ type of screw c … cap screw b … binding head screw m … oval fillister-head screw f … flat head scr...

  • Page 34: Fs-26S Parts List

    Specifications are subject to alteration for improvement without notice. 4 5769 000 4 4125 000 2 3210 007 2 3009 006 4 5708 000 4 5231 000 4 5264 000 2 4881 824 4 4166 110 4 4166 100 4 4166 000 i 4 5701 100 u 4 5762 000 4 5762 100 y 4 4101 000 t r 2 2630 002 e w 4 5702 100 q 4 4102 000 = 4 5771 000 ...

  • Page 35: Fs-40S Engine Exploded View

    \ a s d f \ -1 \ -2 [ \ -2 o p ] g o - 0 9 c.M2.6x7 8 c.M3x18 c.M2.6x12 c.M3x8 c.M2.6x7 y t r e w q = 7 4 3 2 1 5 -4 5 -3 5 -2 4 -1 4 -2 3 -2 3 -1 5 6 5 -1 i u 8 -1 fs-40s engine exploded view ✽ type of screw c … cap screw b … binding head screw m … oval fillister-head screw f … flat head screw n … ...

  • Page 36: Fs-40S Parts List

    Description code no. Screw set rocker cover rocker support assembly rocker support rocker arm retainer (2pcs.) rocker arm assembly (1pair) rocker arm (1pc.) tappet adjusting screw valve assembly (1pair) intake valve (1pc.) valve spring (1pc.) valve spring seat (1pc.) valve spring retainer (2ps.) cyl...

  • Page 37: Carburettor  Exploded View

    Type fs-26s/fs-40s 1 2 3 5 4 1 -1 n.+m3x6 c.M2.6x7 7 6 6 -1 6 -2 6 -3 6 -4 6 -5 m2.6x5 s.M3x3 22081408 22081313 45281200 45281100 45281700 22081811 45281910 45781970 26381501 45283960 23011308 45281920 22081820 no. 1 2 3 5 4 7 6 1 -1 6 -1 6 -2 6 -3 6 -4 6 -5 1 2 3 5 4 7 6 1 -1 6 -1 6 -2 6 -3 6 -4 6 ...

  • Page 38: Parts & Accessories

    (72403050) (71521000) (71615009) (71531000) for 26s (71908300) for 40s (71906000) for 40s 1/4''-28 (23024008) for 40s(45810100) for 40s 1010a (72108300) 1010b (72108310) (72200060) ■ parts & accessories radial mount set o.S.Glow plug type f ■ ■ flexible exhaust pipes ■ spinner nut ■ non-bubble weigh...

  • Page 39: Memo

    Memo 38.

  • Page 40

    C copyright 2000 by o.S.Engines mfg. Co., ltd. All rights reserved. Printed in japan. Un eq ua lle d qu ality precision & perfo rma nc e est ablish ing the standards of ex cel len ce 110101 tel. (06) 6702-0225 fax. (06) 6704-2722 6-15 3-chome imagawa higashisumiyoshi-ku osaka 546-0003, japan url : h...