42
The electric spark firing system ensures inflammation of fuel and air mixture during
starting .
The fuel tank contains the fuel stock required for preheater operation. It is connected with
engine fuel system via fuel lines, and is always filled with fuel when the engine runs. If need be,
it can be filled by means of the engine’s manual fuel feed pump.
The preheater operates as follows: The fuel pump takes fuel from the preheater tank
and injects it into the burner under pressure, with solenoid valve opened. In the burner fuel
mixes with air, gets ignited and burns, heating the fluid in the heat exchanger. The fluid is
forced by the pump through the pipelines, through cylinder block in the direction shown by ar-
rows in Fig. 22.
Combustion products are directed via the gas branch pipe under the engine oil sump and
warm oil in it. Fuel is cleaned when passing the filters provided in the solenoid valve and injector.
1-fuel tank; 2-straight-way valve; 3,12-drain plugs; 4-feed pipe of the preheater boiler; 5-feed pipe; 6-oil
case housing; 7-spark plug; 8-gas driving nozzle; 9-fuel electric heater; 10-electric magnetic valve; 11-
heater boiler; 13-air hose; 14-fuel pipe between the pump unit and the boiler; 15-pump unit; 16-outlet pipe;
17-fuel pipe between the heater boiler and the pump unit
Fig. 24 - Engine Starting Preheating System
