engine tries
to
run
at
a higher speed than A (r.p.m.), a consequential rise of
negative pressure provides greater governing force, which compresses main
spring against its setting
load, thereby pulling back injection pump control rack
to
reduce injection, and as
the
result, engine speed
is
slowed down
to
A
(r.p.m.).
When,
on the
other
hand, engine speed
is
made
to
fall below A
(r.p.m.), a decrease
of
negative pressure lets main spring press control rack
ahead
to
rise
injection rate, whereby it
is
vised back
to
A (r.p.m.). Meanwhile,
the
more Venturi butterfly valve throttles, the quicker
rise
of
negative pressure
to
engine speed can make engine keep low constant speed, by producing
governing force Fc. Governing the engine speed thus
in
one-to-one proportion
to
the percentage of Venturi opening, this governor
is
called an all-speed type.
In
case heavy load on the engine makes it run
at
a lower speed than equivent
to
the
Venturi opening (for example, lower than A even at
100%
of
Venturi
opening,
in
the diagram), control rack
is
pressed over its whole travel
to
full
load
stopper, making it
to
develop max. torque.
If
"tough" torque
is
required
of
the
engine, governor
is
equipped with a buitin torque spring (angleich
spring).
3)
This type of governor requires espeCially perfect air-tightness of air pipe and
intake system, for
lack
of
their air-tightness
will
much affect its performance
and cause
particularly overrunning.
Into air chamber for atmospheric pressure
in
diaphragm block negative pressure
is
lead from inside paper element
of
air cleaner through vinyl tube so as
to
compensate the change of resistance the might arise from its clogging.
4)
Being of sheep skin, diaphragm
in
diaphragm block requires regular lubrication.
(Refer
to
"Lubrication".) When a sudden unusual change noticed
in
idling,
have it checked by your dealer or
at
a service shop,
as
it
is
suspected
to
be
broken from
aging.
Each time
to
apply oil
to
diaphragm, loosen red plug
~n
the side
of
diaphragm
block to draw off the excess
of
diaphragm oil or fuel collected there from
pump.
If
too much fuel found there, make necessary repairs.
5)
In any case whatever,
don't
tamper with the seals on (Fig. 3-26, 3-27)
I njection pump full load stopper Seal
Diaphragm block cover Seal 2
'Idling sub-spring
Seal
3
Venturi lever stopper
("full-open" side) Seal 4
-
30-
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