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to impinge on the dashpot diaphragm rod. As the rod
is moved into the dashpot, the tapered step of the rod
engages the diaphragm washer. Continued movement
of the rod will cause a corresponding movement of
the diaphragm, compressing the air in the diaphragm
chamber above the diaphragm. The compressed air
bleeds out of the diaphragm chamber through a
groove in the seat of the diaphragm washer, retarding
the closing speed of the throttle plate. This allows the
engine to properly use the charge of accelerating fuel,
stalling from an over-rich condition in the manifold.
When the throttle is again opened, the pressure is
released from the dashpot diaphragm rod and the
dashpot return spring moves the rod off its seat in the
diaphragm washer. This allows air to flow back into
the diaphragm chamber. After moving the rod off its
seat, the spring returns the rod and diaphragm to their
original position.
The proper overhaul of the carburetor requires
that it is completely disassembled and each part is
thoroughly cleaned. Each clean part should then be
examined for signs of wear, damage, or deterioration.
Defective parts should be
replaced with genuine Holley replacement parts and
the carburetor should be carefully rebuilt. Care in
rebuilding and accuracy in adjusting the carburetor
will insure the continuation of the characteristics of
power, economy, and performance engineered into
every Holley carburetor.
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