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(4)
Carburetor
intake
air heater
A sheet
metal
jacket
is mounted
over the right-hand
exhaust
manifold.
Its
purpcse'is
to collect
heated
.air and allow
it to be conducted
to the carburetor
a,? inlet
through
the air cleaner
and special
ducting.
A thermostat
controlled
valve
(7,
Fig.
4) in the air $leaner
front
inlet
cover
regulates
temperature
of
air delivered
to the carburetor
by allowing
outside,
unheated
air toent-er
the ducting
when temperature
at the valve
reaches
a predetermined
value.
This inlet
air heating
arrangement
helps prevent
carburetor
icing
and stalling
when ambient
temperatures
are at or near freezing.
C.
Hobart
Installed
Engine
Equipment
(1)
Electric
governor
system
An electric
governor
kit
is installed
on the engine
to replace
a ccnventicnal,
mechan ica I type.
The electric
governor
was selected
for control
of engine
speec
(and generator
output
frequency)
because
it provides
faster engine
response to
changes
in load conditions.
This fast response results
in very close frequency
control.
Refer to the Amerjcan
Bosch Handbook
which
accompanies
this manual
for a detailed
description.
A brief description
is given
below.
The governor
system consists of the following
main components:
Magnetic
pickup
Control
unit
Actuator
Throttle
body and linkage
(a)
Magnetic
pickup
The magnetic
pickup
(5,
Fig. 4') is a device
for detecting
the speed of the
engine .
If is mounted
in the flywheel
housing
directly
over the ring gear.
It produces
an AC signal to the control
unit when the ferrous flywheel
teeth
pass through
the magnetic
field
at the end of the pickup.
(b)
Control
unit
The control
unit
(6,
Fig. 4)
is a box containing
a compact
assembly
of
solid state components.
It receives
an AC signal
from the magnetic
pickup
and senses speed changes
in the engine.
It provides
a voltage
signal
.to the actuator
which
causes the actuator
to maintain
a pre-deter-
mined engine
speed.
Its power
is received
from the
12-V
DC ignition
system.
"I
l\- 1
Page 10
:,
July
l/76
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