User manual OS ENGINES MAX-25LA

[. . . ] 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. q Also, please study the entire contents of this instruction manual, so as to familiarize yourself with the controls and other features of the engine. q 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. q CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O. S. ENGINE INTRODUCTION INSTALLATION OF THE ENGINE INSTALLATION OF SILENCER BEFORE STARTING 2~6 7 8 9 10~12 TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START CARE AND MAINTENANCE OPTIONAL PARTS & ACCESSORIES 10LA ENGINE EXPLODED VIEW & PARTS LIST 26~27 28 29 30~31 ADVICE ON SELECTION OF FUEL, GLOW PLUG & PROPELLER 12~14 STARTING THE ENGINE RUNNING-IN (Breaking-in) CARBURETTOR 15/25LA CARBURETTOR AIR-BLEED ADJUSTMENT 14~22 23 23~24 25 1 15/25LA ENGINE EXPLODED VIEW & PARTS LIST 32~33 CARBURETTOR EXPLODED VIEW & PARTS LIST 10LA THREE VIEW DRAWING 15/25LA THREE VIEW DRAWING 34 35 36 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O. S. [. . . ] Starting qualities deteriorate. · · · · · STARTING THE ENGINE Preparations 14 First, install the propeller on the engine by tightening the prop nut or spinner-nut lightly, and make sure of the position where compression is felt, turning the propeller counter-clockwise slowly. For accurately centering the starter's rubber drive insert, install an O. S. Wrench Alternatively, a spinner assembly, enclosing the propeller boss, may be used, but make sure that it isof sturdy construction and that the spinner shell does not loosen when the starter is used. Warning: When using a spinner assembly, make sure that the notches in the spinner shell are large enough to clear the propeller blades and so do not cut into and weaken the blade roots. Tighten the spinner nut firmly so that compression is first felt around this position (i. e. with blades horizontal) when turning the propeller in the direction of arrow. 4 Filling the fuel tank Do not allow fuel to overflow into silencer when refuelling, otherwise engine may become flooded and difficult to start. 3 Checking for gas leakage Check gas leakage by turning the propeller up to this position after compression is felt. Disconnect fuel line from the fuel inlet, and connect it to the tubing from the fuel pump. Fuel (model glow-plug engine fuel) Dribble a few drops of fuel around the glowplug and look for air bubbles. Compression is first felt around this position when turning the propeller slowly. Fuel pump If leakage is detected, remove the glowplug, carefully wipe threads, re-insert and tighten firmly. Use a fuel can filter (e. g. Super Filter). 15 5 Opening and closing of the needle-valve 7 Open the throttle fully Close Close Fully closed position Open Turn needle-valve clockwise to close (for leaner mixture). Fully opened position Open Throttle 6 Setting the needle-valve Open the needle-valve 4 turns(for 10LA), 3 turns (for 15LA), 11 2 turns (for 25LA) in the direction of arrow from the closed position. Needle-valve 8 Priming Fuel Tube Fuel inlet Place your finger over the carburettor to choke intake. Turn the propeller two revolutions while watching fuel line. Fuel will flow from tank to carburettor as propeller is turned. The position where the needle-valve stops is the fully closed position. It may be convenient to remember the position of the mark or set-screw at this time. 16 Priming quantity After fuel has been drawn to the carburettor, flip the propeller two more revolutions, with intake choked, to draw fuel into engine. NOTE (IMPORTANT) The quantity of fuel drawn into the engine by priming is an important factor in starting the engine successfully. When the engine is being started for the first time, turn the propeller two revolutions after fuel reaches the fuel inlet, as described above. However, when restarting the engine immediately after a run, one revolution, or even no priming at all may be required. The engine's requirements will be quickly learned with experience. 9 Do not energize the glowplug at this stage. Turn the propeller 3 to 4 turns counter-clockwise smartly by finger in the direction of arrow. 10 turns instead when the engine is cold. 17 10 Hold model securely when starting Assistant should hold the model so that it cannot move forward when the engine starts. 12 Heat glowplug Glowplug battery. Place as far to the rear as possible. Starting battery Assistant Starter Be careful not to be hit by propeller! Connect battery leads as shown (polarity is immaterial. ) 13 Apply electric starter 11 Setting the throttle Fully closed position 13 Fully opened position 2 3 Set at this Position. 18 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. Attention: Never place your finger over the carburettor intake when applying the starter. Such an action will cause an excess quantity of fuel to be drawn into the cylinder and result in hydraulic lock that may damage the engine. 14 Engine starts If the engine does not start, refer to the TROUBLE SHOOTING CHART on page 26-27. 15 Needle-valve adjustment(1) Slowly advance throttle to its fully open position, then gradually close the needle-valve until the exhaust sound changes pitch. Listen to the sound carefully. BEWARE of the rotating propeller. In the interests of safety, keep your face and other parts of the body away from the vicinity of the propeller. Close the needle-valve gradually until a high-pitched exhaust note begins to be superimposed on the lower-pitched sound. 19 16 Disconnect battery leads 17 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 highpitched exhaust note, only, will be heard. [. . . ] Repeat priming procedure referring to 8 Priming. 555 Mixture too rich. . Make needle-valve half turn (180°) and wait for several minutes then restart. (Priming is not necessary. ) sure that tank is filled with fuel. Check that there is not something wrong with fuel tubing (kinked or split). Check that carburettor is not clogged with dirt. 3 5 Fuel not reaching the engine. 3 2 55 5 Mixture too rich. . [. . . ]