User manual O.S. ENGINE MAX-40 LA ENGINES

[. . . ] 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 NEEDLE-VALVE LOCATION BEFORE STARTING ADVICE ON SELECTION OF FUEL, GLOW PLUG & PROPELLER STARTING THE ENGINE RUNNING-IN (Breaking-in) CARBURETTOR 2~6 7 8 9 10 10~12 12~14 14~22 23 CARBURETTOR EXPLODED VIEW & PARTS LIST THREE VIEW DRAWING 36 37~38 CARBURETTOR AIR-BLEED ADJUSTMENT TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START CARE AND MAINTENANCE OPTIONAL PARTS & ACCESSORIES ENGINE EXPLODED VIEW & PARTS LIST 23~24 25 26~27 28 29 30~35 1 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O. S. [. . . ] Ignition timing is 'automatic' : under reduced load, allowing higher rpm, the plug becomes hotter and, appropriately, fires the fuel/air charge earlier; conversely, at reduced rpm, the plug become cooler and ignition is retarded. Reminder! 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. 13 Glowplug life Particularly in the case of very high performance engines, glowplugs must be regarded as expendable items. 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. Do not run the engine too lean and do not leave the battery connected while adjusting the needle. 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. Glow plug · · 2 Installing the propeller Washer · 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. Starting qualities deteriorate. First, mount 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, use an O. S. (Available as an optional extra part). · · · · · STARTING THE ENGINE Preparations 14 Alternatively, a spinner assembly, enclosing the propeller boss, may be used, but make sure that it is of sturdy construction and that the spinner shell does not loosen when the starter is used. Wrench 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 as indicated (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 compression leakage Check compression leakage by turning the propeller up to this position after compression is felt. Disconnect delivery tube 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 1 1 2 turns (for 40, 46LA) and 2 1 2 turns (for 65LA) in the direction of arrow from the closed position. 8 Priming Fuel Tube Fuel inlet Needle-valve Place your finger over the carburettor to choke intake. 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. Place as far to the rear as possible. 12 Heat glowplug Starting battery 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. [. . . ] 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". ) 3 3 . 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 Fuel not reaching the engine. 3 2 Mixture too rich. . [. . . ]