Overflow bottle Radiator Expansion tank 1 2 3 4 Pressure cap CODE 1 2 3 4 Cooling liquid Expansion tank Radiator Expansion cap Overflow bottle AUX MAIN 1 2 3 3 4 5 5 6 6 7 CODE 1 2 3 4 Fuel from tank Filter/water trap Electric fuel pumps Fuel pressure control Two carburetors Check valve Return line 5 6 7 Figure 11-7.  Rotax 914 cooling system.  Figure 11-8.  Water-cooled heads. Figure 11-9.  Fuel system components. Lubrication System Electric System The Rotax 914 engine is provided with a dry, sump-forced  lubrication system with a main oil pump with integrated  pressure regulator and an additional suction pump.  [Figure 11-10]  The oil pumps are driven by the camshaft.  The main oil pump draws oil from the oil tank (1) via the  oil cooler (2) and forces it through the oil filter to the points  of lubrication. It also lubricates the plain bearings of the  turbocharger and the propeller governor. The surplus oil  emerging from the points of lubrication accumulates on the  bottom of crankcase and is forced back to the oil tank by the  blow-by gases. The turbocharger is lubricated via a separate  oil line (from the main oil pump). The oil emerging from  the lower placed turbocharger collects in the oil sump by a  separate pump and is pumped back to the oil tank via the oil  line (3). The oil circuit is vented via bore (5) in the oil tank.  There is an oil temperature sensor in the oil pump flange for  reading of the oil inlet temperature. The Rotax 914 engine is equipped with a dual ignition unit  that uses a breakerless, capacitor discharge design with an  integrated generator.  [Figure 11-11]  The ignition unit is  completely free of maintenance and needs no external power  supply. Two independent charging coils (1) located on the  generator stator supply one ignition circuit each. The energy  11-8