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The
.
V -8 engine governor consists of two primary units,
one of which is the centrifugal control valve built into the
ignition distributor. The other unit is a vacuum operated dia-
phragm which is part of the carburetor and is linked to the
throttle.
Care and Maintenance. The attaching bolts should be kept tight
and the governor should be kept clean externally. If the gov-
ernor requires any service attention the truck should be taken
to an authorized service station.
Ignition System
Description. The ignition system consists of the ignition switch
to open and close the circuit, the coil to induce high voltage,
the resistor which prevents
excessive primary current at
low temperatures, the dis-
tributor to make and break
the low tension circuit and
distribute the high tension
current, 14-millimeter spark
plugs to provide the spark
in the combustion chamber
and the necessary wiring
(fig. 38). The battery is the
source of current for the ig-
nition system when starting
the engine or operating at
idling speed. The generator
F19·
38- 1 9 nl ,lon Clrcul,
furnishes the ignition current at higher speeds.
The distributor •• mounting provides a means of properly set-
ting the initial ignition timing. The spark advance for various
speeds and loads is controlled automatically by governor weights
and vacuum control in the distributor. The vacuum control is
connected to the carburetor.
The octane selector at the rear of the distributor mounting
on six cylinder engines provides a means of advancing or re-
tarding the ignition timing for the grade of fuel being used.
Care. The battery and generating system must be kept in good
operating condition. All wiring connections in the ignition cir-
cuit should be kept tight and free from dirt and corrosion.
Keep the high tension wires tight and free from grease .
• 30 •
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