User manual MVVS 58 IRS V1.2

[. . . ] Always wear close-fitting, well-fastened clothes when starting or operating the running engine. Always stop the engine either by turning off the ignition switch or by completely closing the carburetor throttle valve. Before starting the engine make sure that the model is safely fixed in place and cannot start moving. Fuel is combustible and therefore must be kept in an enclosed container at a safe distance from the engine when it is running. [. . . ] The engine can be mounted directly to the firewall or an assembly kit can be used (special accessories). Use M6 screws or screws M5 with a reduction kit (special accessories). If you decide to fasten the engine using flexible motor mounts, always choose parts with enough solidity and strength. Make sure to secure the screws against loosening and regularly check that they are tightened up and in good condition. Position of carburetors difuzors should be placed at least 50mm from firewall. Engine is water cooled so it is not necessary so intensive air flow under cowl. However some ventilating around engine is needed to guarantee intake of cool air. When assembling cooling system follow these instructions: Use black (red) colored hose for hot cycle and transparent hose for cold cycle. Gradient of 40° slightly reduce work of cooler, but gradient more than that cause that cooling system is not working properly. That's why there always has to be enough space behind the cooler for outlet. Filling gap should be placed at the highest place when the scale is on the ground. Than it is possible to check water level. Carburetor adjustment Basic setting: (The values are derived from the position of clock-hands) - adjusting needle (L) for low revolutions range 1turn and 45 min - adjusting needle (H) for high revolutions range 1 turn and 10 min The new engine comes adjusted to the basic setting. Air pressure inlet - Adjusting needle (H) Adjusting needle (L) Filling and venting cooling system: Put you aircraft on its undercarriage, unscrew the filling lid and pour water in it. Get off both hoses from the pump and when water starts to come out put them back on the pump. Raise the air model up so the engine is at the highest position and shake slightly. Place the aircraft back on ground and put off and quickly back hoses going to pump. Fulfill water level, start the engine and leave it running for about 1minute. In first 30 minutes stop the engine after every 5 minutes and check water level and fill it if needed. Choke lever Operation recommendation: Always check coolers temperature while first starts. By size of cooling space you can manage keeping recommended temperature. If cooler is not behind the propeller reduce running engine on ground to minimum. In this kind of scales run the engine in on some stand with cooler place behind the propeller. Before each fly check if the pump strap is tight and if there is enough water in the system. If the power is loosing while flying or irregular run occurs, always land on immediately and doublecheck cooling system. Crankcase pressure inlet - Throttle lever Fuel inlet Caution! [. . . ] Use up all fuel that was produced as a mixture with the oil that is included in the package. · A COLD ENGINE SHOUL BE WARMED UP BY SHORT ACCELERATIONS (1-2 SEC) Throttle stop screw Throttle lever spring Problem guide The engine would not start: check and possibly replace the spark plug (check the spark by inserting the plug into the plug socket and turning the engine. The correct electrode spacing is 0, 6 mm. ) check the fuel feed turn the engine to check its mechanical condition check whether the carburetor needles are adjusted correctly take the carburetor off and visually examine the condition of the carbon-fiber reed valve unscrew the carburetor cover on the side of the pressure inlet, check the fuel screen possibly give the carburetor a blow with a current of air; when reassembling, make sure you arrange the membrane and gasket in a correct order recheck the pressure hose attached to the carburetor Replacing the reed valve: unscrew and remove the carburetor (mind the gasket) unscrew four M4 screws on the flange, remove the flange and take off the reed valve (mind the gasket) unscrew four M2 screws and remove the old valves, replace them with new ones, screw the screws back in and tighten them gently when reassembling, make sure you fix the gasket correctly Mechanical faults of the engine must always be commit to a professional service department! Service information After every 5 running hours exchange the pump strap. After each 50 hours of operation time preventively check up the con-rod and the reed valve. [. . . ]