MANIFOLD FLAME HEATER
flame heater (fig. 5-44) is another type
of cold starting system found on diesel engines. This system is composed of a housing,
spark plug, flow control nozzle, and two solenoid control valves. This system operates as
flame heater ignition unit energizes the spark plug.
nozzle sprays fuel under pressure into the intake manifold assembly.
fuel vapor is ignited by the spark plug and burns in the intake manifold. The heat from
this fire warms the air before it enters the combustion chamber.
The flame fuel
pump assembly is a rotary type, driven by an enclosed electric motor. The fuel pump
receives fuel from the vehicle fuel tank through the supply pump of the vehicle and
delivers it to the spray nozzle. The on/off switch, located on the instrument panel,
energizes the pump.
manifold flame heater system has a filter to remove impurities from the fuel before it
reaches the nozzle.
The two fuel
solenoid valves are energized (open) whenever the flame heater system is activated. The
valves ensure that fuel is delivered only when the system is operating. These valves stop
the flow of fuel the instant that the engine or heater is shut down.
When troubleshooting or repairing these units, you should consult the
manufacturer's service manual.