PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 2/TASK 1
FIGURE 40.
EXHAUST-HEATED INTAKE MANIFOLD.
(2) Directing the engine coolant, which is laden with engine heat, through the
intake manifold on its way to the radiator (figure 41 on the following page).
e. Intake Manifold Flame Heater System (figure 42 on page 52).
Engines are
equipped with a flame-type manifold heater for heating the induction air during
cold weather starting and warmup operations.
(1) Operation. The flame heater assembly is composed of a housing, spark plug,
flow control nozzle, and two solenoid control valves. The spark plug is energized
by the flame heater ignition unit. The nozzle sprays fuel under pressure into the
intake manifold elbow assembly.
The fuel vapor is ignited by the spark plug and
burns in the intake manifold, heating the air before it enters the combustion
chambers.
(2) Because this system uses fuel from the fuel tank of the vehicle, its
components must be compatible with all approved fuels when the system is used with
(a) 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
vehicle's supply pump and delivers it to the spray nozzle. The pump is energized
by an ON-OFF switch located on the instrument panel.
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