Referring
to
t.lie
diagram,
above.
the
coolant
is
se
t
in
forced
recirculation
by
the
water
pump
. which is a
centrifugal pump driven by cooling-fan belt. The pump
draws
coolant
from
the
lowe
r
tank
section
of
ra
diat
or
(4) and forwards it to the water inlet
of
crankcase (7).
Upon entering the middle section
of
the crankca
se
,
coo
lant
flows
in
the
jac:k-et
to
cool
the
cylinders:
lhen
it
ris
es
into jac
ke
t (5)
of
cylinder head (6)
to
cool the
co
mbustion
chambers
and
areas
around
the
intake
and
exhaust valves . From the forward end
of
the cylinder
hea
d.
t
he
coo
lant
I now hot
because
it
ha
s
taken
as
much
heat"
it can, flows in
to
the inlet of
thermo,
tat (1).
The
thcnnos-tat
,
respondin
g
to
cool
ant
tempera
ture,
co
ntrol
s
the
now of cool
ant
t
oward
th
e r
adia
tor
upp
er
tank
.
Wh
en
co
olan
t
temp
e
ratwe
is low
as
wh
en
the
enginl!
has
just
been
started
up
fr
om
cold
state,
the
thermostat
valve
remains
cl
osed
and
aU
of
the
coolant
is
diverted back to the water
pump
inlet through bypass
hose
(3): under this condition, radJ.tor
(4)
is
bypassed
by
the
c:oolnnt.
As
the
nsing
c
oolant
temperature
reac
h
es
76.S
o
C
(I69.7'F),
the thermostat
valve
begins
to
open increas-
ingl)' wide and the coolant
begins to
now
to
radiator (4)
@
CONSTR
UCT
ION
AND
FUNCTION
at
a
rising
rat
e of flow, whh a corresponding d
ecrea
ses
in
the amount
of
coolant being byp
....
d.
As
the tern·
peraturo
re
aches
90'C
(194'F)
,
the
,'alve becomes full
open,
sh
utting
offth.
bYpass
passage.
The probe f
or
temperature gau
ge
(2) is installed in
the
cooiant
outlet
of
cylinder head.
It
is
with the
sign
oj
produced by this probe that the gauge Oocated at the
control station) operates.
Water
pump
Pump c
as.
(6)
is
secu
re
d to cylinder block throu
gh
cov
er
plate (10). Pump shaft (3)
is
StJp
po
rted by t
wo
ball bearin
gs
(5) having a large bearing c
ap
acity.
Lu
be
aU
is
supp
li
ed
under
p
ress
ure
from
en
gin
e ma
in
oil
gallery into space
(I)
f
anned
around shaft between
the
two
bearings
.
Two oil
se
al
s (2) contain the oil so
admitted
to lubricate
th
e bali bearings. Unit seal (9) prevents coolant from
leaking out along the shaft. Impeller (8) is threadedly
mounted on the inner end
of
Ihc
shall,
and puUey (1) is
keyed
lo
the
outer
end_
Crankshaft pulley and pump pulley
(1)
are 10 the speed
ratio
of
1 to
1.
2. Th.
pump
capacity
Is
100 lilers
(6103
co in .
)/minute
at
2520
pump
rpm_
l·Pu_"
e
V
2-
011
$EliI!Il
J..Shah
4.spacer
5-BBII be.arings
6-Caso
7-$pace filled wi
th
lube 0
1'
S.lmpl!llIer
g..Unit
91!lsl
,O-Co\,or
pl
ate
Water
pump
- Cro
ss
se
ction
Thenoostat
The thermostat!,
of
wax type, de
si
gned to
,tar
t opening
i
lS
valve
at
765
± Z'C (169.7 ±
3.6·F)
of
ri'ing tem- '
perature and open it fully at
90'C
(J94'F),
lifting il
off
the
seat
by 9
mm
(0.35 in.)
(ma.UmUTO
lift).
-v~~
Lift: g-
mm
~(],3S
in.)
37
To Next Page
Loading...
