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LP Engine G430(3.0L) Governor System
Stabilizer Piston
Figure 8-9 Stabilizer Piston
While the governor valve is limited to a specific
opening angle, engine speed will oscillate due to
pulsations in the intake system of the engine. These
pulses, while a normal condition in engine operation,
will cause the engine speed to oscillate (surging). To
minimize this condition, a stabilizer piston is
incorporated into the governor design (figure 8-4). The
stabilizer piston is connected to the governor valve by
means of a rod. A slot in the hole for the rod works as
a vacuum passage for the piston. When the governor
valve is subjected to pulsations, the stabilizer piston,
which is held in place by engine vacuum prevents the
movement of the governor valve. The stabilizer piston
works in conjunction with the cam and spring
assembly to balance the pressure on the governor
valve while maintaining a constant engine speed. In
order to perform this action smoothly, the back face of
the stabilizer is exposed to atmospheric pressure. This
opening should be connected to the engine air cleaner
or external filter to prevent dirt ingestion.
Governor Operation
Engine Stopped
Figure 8-10 During Engine Stopped
When the engine is not operating, the governor valve
is held in the open position by the pressure exerted on
the cam by the governor spring (figure 8-10).
Low Engine Load
Figure 8-11 Under Low Engine Load
When the engine is operated under low load
conditions, the venturi vacuum will draw the stabi-lizer
piston inward (figure 8-11). This pressure will
overcome the spring force and the governor valve will
close.
7226-400-019
7226-400-018
7226-400-017
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