CONSTRUCTION
AND
FUNCTI
ON
a.
Check
valve
action
During nonnal opera lion, lhe
valv
e 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
press
urizes the f
ue
l in delivery
cham
b
elT
to
ov
er-
com
e the force
of
vaJye
spring, the valve unseats
and l
et
s out the
high
-p
re
ssure fuel into the inje
c-
tion
pipe_
. b. Retracting action
Con
si
der the downward mo
veme
nt
of
the de
li
ve
ry
v
al
ve fo
Uo
w
ing
the end of
fuel
pressurization. The
land enters the bo
re
of
the seal 3S the
val
ve
g~
es
dow
n, so that the delivery
cha
mber
becomes
i
so
lated from the injection pipe.
Th
e further
do
wnward movement
of
the land draws a small
am
ount
of
fuel from the pipe and, when the valve
cone h
as
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 stro
ke
(1)
8eginni
ng
at
UtnlCtil'lg IctiOfl (2)
End
of
£!'JlCuaca
ing
action
Type
RS
V governor
(J)
Description
28
By
type, the governor
is
3 meen,nieal flyweight
governor;
by function,
it
is
an
all-speed governor
operating
in response to changes in engine speed
to
actuate the control
ra
ck In order to maintain
engine
speed at a constant
level
proportional
to
the
set position
of
the acceleI8tor. This governor
function
is
in sharp
co
ntrast to that
of
a minimum-
spud
maxim
um
-spted governor, whose control
ac
ti
on is to
lim
it the
low.,t
and highest speed. of
the engine,
leaving
the. control of intermediate
speeds to the operator.
The
REV
go
vernor too limiu the lowest and
high
est speeds to provide a speed r
ange
o
ve
r which
it perfonns the governing action mentioned above,
These
limits,
as.
w
ell
as
its speed regulJition, can be
c
h.anged
by
means
of
adjusting
lever
and
screws:
.
1·A
d
hm
in
5l
l
ever
3·ldli
n-g
set
$Cr
aw
2
...
J.1exirnum s
peed
stOP 5cre\
'i
Governor
To make
full
usc
of
the advanta
ges
lnherent
Ln
this
go
vernor, 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
l
eve
l can be adjusted
to
suit what 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
attempl 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
out
p
ut
power
or
in
overspeeding.
2.
Full
load stopper
is
set
to
su
pply
th
e right
amount of fuel f
or
full-load operation. Distu
rb
-
ing
this setting
Is
likely
to
result
in
lack
of
ou
tput
po
we
r or in
di
r
ty
or
black exhaust
smoke
.
Ad
justing screw f
or
the swiveling lever is set at
the position
10
w
hi
ch
It
has
been backed away by
24
notches
(6
rotations) or less from fully run-in
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