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 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.
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE Remember that your engine is not a "toy", but a highly efficient internalcombustion 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 future date, your O.S. engine is acquired by another person, we would respectfully request that these instructions are also passed on to its new owner.
NOTES This engine was designed for model aircraft. Do not attempt to use it for any other purpose. If you remove the glowplug from the engine and check its condition by connecting the battery leads to it, do not hold the plug with bare fingers.Use an appropriate tool or a folded piece of cloth. Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts.
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. For their safety, keep all onlookers (especially small children) well back (at least 20 feet or 6 meters) when preparing your model for flight. If you have to carry the model to the take-off point with the engine running, be especially cautious.
How to fasten the mounting screws. INSTALLATION Installation in the model A typical method of beam mounting is shown below,left. 3mm steel nuts for FS-30S 3.5mm steel nuts for FS-40S Spring washer or lock washer O.S. radial motor mount (Available as an optional extra part. See parts list) Tighten second nut firmly down onto first nut. Tighten this nut first. Hardwood such as cherry or maple. 3mm steel screw for FS-30S 3.5mm steel screw for FS-40S Rigid hardwood (e.g.
SILENCER BEFORE STARTING Installation for FS-30S and FS-40S Tools, accessories, etc. The following items are necessary for operating the engine. Screw the exhaust header pipe into the exhaust port until it "bottoms", then unscrew it just sufficiently to achieve the required exhaust outlet angle. Secure the pipe in this position by tightening the locknut firmly against the cylinder head with the wrench supplied. Then, screw the silencer onto the end of the header pipe and tighten locknut firmly.
9 Electric starter and starter battery An electric starter is recommended for starting. Note: When cutting silicone tubing··· Silicone tubing 10 Fuel can filter Install a filter in the outlet line of your refuelling container to prevent entry off oreign matter into the fuel tank. (Refer to 3 of STARTING THE ENGINE section.) Do not use wire cutters or pliers. Use knife or razor blade *If you should need to clean the silicone tubing, use methanol or glow-fuel, not gasoline or kerosene.
Sport & Aerobatic Glowplug life Trainer & Scale FS-30S 9x6-7, 10x4 10x5-6 FS-40S 10x7-7.5, 11x6 10x7, 10.5x6, 11x7 12x5-6 Particularly in the case of very high performance engines, glowplugs must be regarded as expendable However, plug life can be extended and engine performance maintained by careful use, i.e.: Install a plug suitable for the engine. Use fuel containing a moderate percentage of nitromethane unless more is essential for racing events.
Starting 7 Priming 4 Opening and closing of the needle-valve Fuel will flow from tank to carburetor as propeller is turned. Turn needle-valve clockwise to close (for leaner mixture). Turn needle-valve counter-clockwise to open (for richer mixture). Close 5 Setting the needle-valve Open Turn the needle-valve in the direction of arrow slowly, without forcing, until it stops. The position where the needle-valve stops is the fully closed position.
13 Needle-valve adjustment(1) 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. Slowly advance throttle to its fully open position, then gradually close the needlevalve until the exhaust sound changes pitch.
Subsequent starting procedure On starting from cold, with the needle-valve set at the rich starting position: Once the optimum needle-valve setting has been established (see 16 "Needle-valve adjustmentSummary") the procedure for starting is simplified as follows: 1) Open the needle-valve one half-turn (180˚) from the optimum setting. 2) Open the throttle fully, place your finger over the carburettor intake and rotate the propeller through two revolutions to prime the engine.
CARBURETOR These engines are equipped with a throttle type carburetor 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 to full power.
CARBURETOR AIR-BLEED ADJUSTMENT Start the engine. Pre-Flight Check Make sure that the throttle is fully open. Start engine and adjust needlevalve as previously described. 20-30˚ open from maximum r.p.m. setting. Adjust the neede-valve. Close the throttle gradually. Close the throttle gradually. Find the idling position. The position where the lowest possible r.p.m. ,with steady running, is obtained. Find the idling position. Re-set the idling position at a little higher r.p.m.
TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START Four key points For quick, reliable starting, the following four conditions are required. 1 Good compression. 2 Adequate "glow" at glowplug. 3 Correct mixture. 4 Sufficient electric starter rotating speed. If the engine fails to start, or does not keep running after being started, check symptoms against the following chart and take necessary corrective action.
Note: Valve clearances of all O.S. four-stroke-cycle engines must be checked and reset ONLY WHEN THE ENGINE IS COLD. Procedure is as follows: 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, valve clearances should be checked and readjusted, as necessary an O.
5. Remove 0.04mm feeler, rotate prop through two revolutions and recheck gap. 3. Insert 0.04mm feeler gauge between valve stem and rocker-arm and gently turn adjusting screw clockwise until it stops.(Fig.4.) 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. Turn with fingers until it stops. Remember: Excessive valve clearance will cause loss of power, due to valve (s) not opening sufficiently.
O.S. GENUINE PARTS & ACCESSORIES O.S.
FS-30S ENGINE EXPLODED VIEW FS-30S PARTS LIST C.M2.6x12 No. 2 C.M2.6x18 3-2 3-1 3 (C.M3x10) 4-1 4 4-2 5-4 5-3 5-2 5 7 8 5-1 6 9 1 10 12 22 23-2 23-1 23-2 24 13 14 25 17 18 16-1 33 32 11 26 23 27 19 20 21 C.M2.6x7 16 15 Type of screw C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw C.M2.6x7 1 2 3 3-1 3-2 4 4-1 4-2 5 5-1 5-2 5-3 5-4 6 7 8 9 10 11 12 13 14 15 16 16-1 17 18 19 20 21 22 23 23-1 23-2 24 25 26 27 Code No.
FS-40S ENGINE EXPLODED VIEW FS-40S PARTS LIST C.M2.6X12 2 No. C.M3X18 3-2 3 3-1 4-1 4-2 5-3 4 5-4 5-2 5 C.M2.6X7 7 8 5-1 6 10 11 24 25-2 12 13 25-1 15 25 25-2 26 14 30 19 27 21 16 29 23 18 17 C.M3X8 28 20 Type of screw C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw C.M2.6X7 22 21 35 34 1 9 1 2 3 3-1 3-2 4 4-1 4-2 5 5-1 5-2 5-3 5-4 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 25-1 25-2 26 27 28 29 30 Code No.
CARBURETOR EXPLODED VIEW & PARTS LIST TYPE 20N 4 No. C.M2.6x7 N.+M3x6 1 1-1 5 2 6 3 3 4 6-2 1-1 5 2 6 6-1 1 6-4 M2.6X5 6-2 6-3 6-1 7 6-3 6-4 7 S.M3X3 Code No. 22081408 22081313 45281200 43081100 45281700 22081811 43081900 45781970 43081960 22611302 45281920 22081820 Description Throttle Lever Assembly Throttle Lever Retaining Screw Carburetor Rotor Carburetor Body Carburetor Retaining Screw(3pcs.
FS-30S THREE VIEW DRAWING Dimension(mm) Specification 4.89 cc (0.299 cu.in.) 19.5mm (0.767 in.) 16.4mm (0.648 in.) 2,500-13,000 r.p.m. 0.5ps / 10,000 r.p.m. 279g (9.56 oz.) 36 Displacement Bore Stroke Practical R.P.M. Power output Weight (Weight of Silencer) 18g (0.6 oz.) 14 71.5 4- 3.3 15 UNF1/4-28 29 28 44 47 75 37 112 38 FS-40S THREE VIEW DRAWING FS-40S Dimension(mm) Specification Displacement Bore Stroke Practical R.P.M. Power output Weight 6.49 cc (0.396 cu.in.) 21.2mm (0.835 in.
MEMO LL L I TY PRECISION & P ERF QUA ED OR M TA BL ISH ING NC ES E E ANC UNEQ UA 40 L CEL THE STAN ARDS OF EX D E 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 2002 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
