User manual OS ENGINE FSA-72

[. . . ] 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. It is suggested that any instructions supplied with the aircraft, radio control equipment, etc. , are accessible for checking at the same time. CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O. S. [. . . ] 2) Set the exhaust outlet at the required position by rotating the rear part of the silencer. Contact with the muffler (silencer), cylinder head or exhaust header pipe, in particular, may result in a serious burn. Keep your hands and face away from exhaust gas or you will suffer a burn. Assembly screw Exhaust pressure nipple Baffle Turn to reguired position "O" Ring "O" Ring Locknut Exhaust outlet 18 FUEL TANK & LINES Suggested fuel tank capacity is approx 220cc. Make sure that the tank is well rinsed out with methanol or glow fuel before installation and that the pickup weight is well clear of the bottom of the tank when held vertically. Use a suitable length of best quality 5mm OD x 2. 5mm ID silicone tubing for fuel tubing. The Fuel line pickup weight should be 10mm away from the back of the tank. Position the fuel tank so that approximately 1/3 of the tank height is above the center line of the needlevalve. Be sure to use a pressurized fuel system by connecting the muffler pressure nipple to the vent-pipe of the fuel tank. Locate the fuel tank as close to the engine as possible to minimize fuel level pressure variation. 10mm For carburetor Plug (commercially available) 19 PROPELLER There is a risk, particularly with powerful fourstroke engines, of the propeller flying off if the prop nut loosens due to detonation ("knocking") in the combustion chamber when the engine is operated too lean, or under an excessively heavy load. Install this as follows: Propeller washer Locknut Propeller nut 1. Install the prop to the engine shaft, followed by the retaining washer and prop nut and tighten firmly with a 12mm wrench. Add the special tapered and slotted locknut and secure with a 10mm wrench (not supplied) while holding the prop nut with the 12mm wrench. 20 NOTE: Make a habit of always checking the tightness of the propeller before starting the engine. Remember that, especially with wooden propellers, there is a tendency for the material to shrink, or for it to be reduced by the serrated face of the drive hub. Retighten the propeller nut if necessary after loosening the Safety Propeller Locknut. The locknut should be tightened firmly after retightening the propeller nut. GLOWPLUG Since the compatibility of the glowplug and fuel may have a marked effect on performance and reliability, it is suggested to use the O. S. Carefully install plug finger-tight, before final tightening with the correct size plug wrench. The role of the glowplug With a glowplug engine, ignition is initiated by the application of a 1. 5-volt power source. When the battery is disconnected, the heat retained within the combustion chamber remains sufficient to keep the plug filament glowing, thereby continuing to keep the engine running. 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. 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. [. . . ] However, if, after a considerable amount of running time, a loss of power is detected, or if he engine has been disassembled for repair, these clearances should be checked and reset as necessary. For checking and adjusting the valve clearances, a VALVE ADJUSTING TOOL KIT is available as an optional accessory. The kit comes in a plastic case and includes: (Code No. 72200060) · Feeler gauge 0. 04mm · Feeler gauge 0. 1mm · Hex. key 1. 5mm · Wrench 5mm Please pay attention to the matters described below to ensure that your engine serves you well in regard to performance, reliability and long life. As previously mentioned, it is vitally important to avoid operating the engine in conditions where dust, disturbed by the propeller, may be deposited on the engine and enter its working parts. [. . . ]