PRINCIPLES GASOLINE/DIESEL FUEL SYSTEMS - OD1620 - LESSON 2/TASK 2
FIGURE 61. TIMING DEVICE OPERATION.
b. Intake Manifold Flame Heater System (figure 62 on the following
page).
(1) General. Engines are equipped with a flametype manifold heater
for heating the induction air during cold weather starting and warmup
operations.
(2) 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 chamber.
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