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CONSTRUCTION AND
FUNCTION
a.
Check valve
action
During nonnal opera
lion
,
lhe
valve
spring keeps
th~
valve
sested when
the
plungtr
is
in non.injec-
tion
position
or,
if
it
is
in injecling
position,
when
it
is
moving
on
downward stroke. As the
plunger
pressurizes the
fuel
in
delivery cham belT to
over-
come
the force
of vaJye
spring,
the valve unseats
and
lets
out
the high-pressure fuel into the
inje
c-
tion pipe_
.
b.
Retracting
action
Consider
the
downward
movement
of the
delivery
valve
foUowing
the
end of fuel
pressurization.
The
land
enters
the bore
of
the
seal
3S
the
val
ve
g~
es
down,
so
that
the
delivery
chamber
becomes
isolated
from
the injection
pipe.
The further
downward
movement
of
the
land
draws
a
small
amount
of fuel from the
pipe and
,
when
the valve
cone
has
seated fully
.
this fuel is in the annular
recess
(called
"exfIilction
VOlume").
By
this extraclion,
which occurs
within a flash of
momenl, the
injection pipe be<:omes. instantly
de-pressurized, thereby
enabling lbe
injection
noztie to snap
imo closed
posllion
and
thus
preventing the
.econdary
Injection
or
dribbling
from occurring
aftm-
each fuel
injection.
e
xtrllCting
stroke
(1) 8eginning
at
UtnlCtil'lg IctiOfl
(2) End of
£!'JlCuacaing
action
Type
RSV
governor
(J) Description
28
By type
,
th
e
governor
is
3
meen,nieal flyweigh
t
governor;
by
function,
it
is
an
all-speed governor
operating
in
response
to changes
in
engine
speed
to actuate the control rack
In
order
to
maintain
engine speed
at
a constant level
propor
tional
to
the set
position
of the
acceleI8tor.
This governor
function is
in
sharp contrast to that
of
a
minimum-
spud maximum-spted
governor, whose
control
action
is
to
lim
it
the low.,t
and
highest speed.
of
the
engine,
leaving
the.
control of intermediate
speeds to the
operator.
The REV
governor
too
limiu
the lowest
and
highest speeds
to provide a speed
range
over
which
it
perfonns
the
governing action
mentioned
above
,
These limits,
as.
well
as
its
speed regulJition, can
be
ch.anged
by
means
of adjusting lever
and
screws:.
1·Ad
hm in 5l
l ever
3
·
ldlin-g set
$Craw
2 . . .
J.1exirnum speed
st
OP
5cre\'i
Governor
To
make
full
usc of the
advantages
lnherent
Ln
this
governor,
it
is
well
10
know
its characteristics,
whiC'-
h
may
be summarized
as
follows:
(a) Compact and lightweight
(Ill
Automatic
supply of excess fuel for sl3tUng
(e) Adjustable speed lange and regulation for
adapting the engine
to
each type
of
duty
(d)
Maximum
injection quantity
for
each
speed
level
can
be
adjusted to sui
t
wha
t
the
engine
domand.,
by
adding an adaptor
spring.
(2)
Basic rules on governor
..
!tin,
The governor
is
factory-sealed
.
Do
not
break the
seal
in an
attemp
l
10
change the
settings of
critical
part.
unless
you
are
qualified
to do
so.
I.
Maximwn speed stopper
ill set to supply the
right amount of
fuel
to
the
engine at tile
upper
limit
of
the speed range_
Disturbing
this setting
ill likely to
result
in
Jack
of output power
or
in
overspeeding.
2.
Full
load
stopper is
set to supply the right
amount
of
fuel
for full-load
operation.
Disturb-
ing
this setting
Is
likely
to
result in lack
of
output powe
r
or
in dirty or black exhaust
smoke.
Adjusting
screw for the swiveling lever
is
set
at
the position
10
which
It
has been backed away by
24
notches
(6
rotations) or
less
from
fully
run-in
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