36
The removable burner is bolted to the heat exchanger. Plug 7, solenoid valve 11
in asembly with the injector and electric fuel heater 10 are fitted on the burner.
The solenoid valve cuts in and off the fuel to the burner.
The injector fitted in the solenoid valve body sprays fuel needed for combustion.
The electric heater warms the fuel portion before starting the preheater.
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 arrows in Fig. 25.
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.
Starting Preheater Service.
Remember that violating the operation rules as well
as operating a faulty preheater may cause fire. See that there are no coolant and fuel
leaks through the joints of pipelines, hoses and cocks; see that the clips on the heat
exchanger branch pipes and pipelines are tight.
Do not fill water in the overheated (due to fluid lack) heat exchanger so as to
preclude its damage; cool down the heat exchanger before filling water.
After truck washing or ford passing remove water which entered the preheater air
duct by operating the pump unit during 2-3 min.
Take care that the preheater fuel pump is adjusted correctly.
When preparing the truck for winter operation proceed as follows:
- screw the transport plug out of the fuel pump drain hole. When returning to
summer operation, screw it in;
- open the cock of the preheater fuel tank and leave it opened throughout
the winter period of operation. When returning to summer operation, close the fuel
cock;
- check the heat exchanger and pump unit for proper fastening, clean all
the instruments of dirt; check the wires for good condition and the control console
for proper fastening. Clean the heat exchanger gas duct and combustion chamber.
For this purpose disconnect the air supply hose and blow through the heat
exchanger, combustion chamber and gas duct. Clean the drain pipe of the heat
exchanger burner in order to eliminate fuel accumulation;
- remove carbon deposit from the electrode and insulator of the spark plug.
Disassemble and wash in kerosene or acetone the injector and its fuel filter as well
as the solenoid valve fuel filter;
- check the preheater fuel pump for correct adjustment. The optimum fuel feed
to the combustion chamber is determined in service by a steady preheater operation
with no flame ejection out of the heat exchanger.
