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Automatic Choke System - Od162070041
Figure 25. Engine Coolant Heated Choke. - Od162070043
Principles of Gasoline And Diesel Fuel Systems
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PRINCIPLES
GASOLINE/DIESEL
FUEL
SYSTEMS
-
OD1620
-
LESSON
1/TASK
2
(5)
Providing Automatic
Choke
Heat.
The four
methods
of providing
controlled heat to the automatic choke thermostatic spring are:
(a)
Electricity
(figure 24).
A large portion of the vehicles
currently produced use an electric coil to heat the thermostatic coil
spring.
The
heating
coil is switched on with the ignition switch.
Some
systems employ a
control unit
that prevents power from reaching the electric
coil until the
engine compartment
reaches a desired temperature.
FIGURE
24.
ELECTRIC
CHOKE.
(b)
Engine Coolant
(figure 25 on the following page).
Another
method of
heating
the thermostatic coil is to circulate engine coolant
through a passage in the thermostat housing.
(c)
Intake Manifold
Crossover
(figure 26 on the following page).
One
of the most popular
methods
of providing choke heat, until recent years,
is to utilize
exhaust
heat.
The usual
way
of doing this is to mount the
choke
mechanism
containing the thermostatic coil in a molded well on the
intake manifold over the crossover passage.
The choke
mechanism
then
operates the choke valve through linkage.
36
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