position,
Never
try
to
back
it
away
more
than
.24
notches
or
the
ad
justing
screw
will come off
evtntually
to create a hazardous conditi
on.
(Refer
to
the part dealing with
the
,d
j
ustment
of
speed
regul.
tion.)
Unless you
have
ov
erhaule
d
RSV
governors.
many
times.
and
c
an
r
emember
the
o
verhauling
pro-ce
·
dure, be
sur
e to refer to
the
disa
s.sem
bling
and
a,sembling procedure,
outlined
in
the
Im . r
se
c·
tion of
this
manual
if
you
are
to
overhaul them.
Never
ee-use
d c
cli
ps, "E"
r.i..ngs
a..rHi
"
0"
rings
removed
in
disass.emblY
. U
se
new
parts:
in
:reass
em·
bly.
(3) Operating principles
The fundamental prin
ci
ples
of
• flyweight gover·
nOr
ar.
schematically illust
rat
ed here.
Ann.
(A)
of
flyweights, pivoting
",ound
point (C), push
on
the
,pring
.backed block,
Wh
ose key point
is
Indicated
as
(B). The push is
due
to
the centrifugal force
of
revo
lvi
ng
Oywejghts
.
l·F
lywoi
ghu
2
'S
P,
iI')SI
Principle
of
gO\leming Bction
When
th,
revolving speed is constant, the push
is
in
balance
with
the
counter·force exerled
by
the
compressed
spring,
This IS
an
equilibrium c
ondi
-
tio
n.
When
the speed incr
ea:v.:s
, for mstance,
the
whole system seoks a
new
equilibrium, relocating
point
(B) and block
to
the
dot
-line position.
In the injection
pump
, point (B)
is
connected
through a linkage
to
lhe
cont
rol rack; the rack is
puUed
01
pushed
to
vary
the injection
quantity
,
thereby lowering or raising
the
engine speed,
(4) ConCrolspring
It
will
be recalled
that
the
spring rate
(or
co
n.tant)
is ,
h.
force required
to
stretch
or
compress
it
by
unit
!e
nglh
.
Of
course,
thi
s
force
is
in
the
axial
direction.
For
[he tenslon
lever,
that
part
of
the
spring
rate
of
the
contra)
spring
, effective
for
CONSTRUCTION
AND
FUNCTION
pulling this lever,
can
be changed
by
angling the
spring.
Swiveling lever
is
the
mun,
of
angling.
1.(;on1fol
roPring
2·Tcn5i
on
lever
?ff4W!1i(4
3,F
l,lll
·lcad $topj):8r
4.swivc
ling l
e'l£lr
Control
spring
operation
Note t
hat
hook
hole (E)
is
in the arm
of
S
wiveWlg
l
ever.
and
!.hat
this
arm
can
be
mIned
down
(to
r
educe
the tensile preload on conuol
sprin
g)
or
up
(to
increase
the
preload)
by
means of the adjusting
screw
.
11,u
s,
that
componenl of
the
s.pring
force
atting
on
po
in
t (D)
to
turn
ten
si
on
l
ever
can
be
s;,'
mitially by positioning sWi;,eling lever and also
irs
adjus
t
ing
screw
,
OUf
interes
t
is
n01
in
ho
.....
much
fo
rce
control
s
pring
exerts
to
tension
lever
but rather
in
that
patt
of
thi'
for
ce
effoeli"
in
turning
the
lever
around
its pivot
poin
t
up
aboye.
This
arrangement of
control
spring (1)
r.l.tive
to
tension lever (2)explainswhY,in
th~RSVgovemor,
there
is
no need
of
using
more
than
one
c
ontral
spring
to
change
the
gove
rned
sp.ed
(the
speed
Which
the governor operates
to
maintain)
and
to
increase
or
decrease
the
speed
regulation
(OJ
sp
eed
droop).
Note, also,
that
th
e block
with
its
point
(8)
ex.rts
pus
h to ttmsion
lever
in
the
direction
oi
the
aJrow
;
this push is
opposed
by the pull of control .pring.
This opposing
pull
can be increased
or
decreased
by
turning
the
swiveling lever around
it
. pivot (F).
Jf
tension levee happens
to
be
off
and
away
f
rom
fuil
-load
stopper. the
increase
or
decrease
of
this
pull (against a given push of the
bl
ock) causes
th
e
control
rack
to
move
inward
or o
utward,
th
us
varying
the
ra
t
e.
of
fuel
injec
tlon
to
raise
or
lower
the
engine
speed; consequently
the
push
increases
or
decreases
to introduce a
new
equilibrium
.
29
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