Valmet 309 - Page 74

The 6ll and 612 englnes have
tvo separa+e
thermos+a+s, one
of
|ihlch
regulaies
ihe coolant
by-pass.
The
thernostol
houslng
ls
flxed on+o
+he +op of +he c@lant
pump
or lis rlght
slde.
The iheritoslats
dllfer ln types
and openlng
+emperaiures.
l{hen
fhe
coolan+
tqnperature ls
belo{ +he thermosiat
opgnlng
temperature
fhe
c@lan+
(A)
clrculales
through the
by-pass
hole
lnio the coolanf
pump.
The srnaller,
glngle-
ac+lng +harmostaf
(l)
opens
flrst
(a+
79oC),
let+ln9
par+
of ihe coolant
(B)
into
lhe
radlaior. Follol'lng the load
lncreaso, also
lhe
other lhermostat
(2)
opens
(at
SloC).
Thls ls
a double-actlng +ype
l{hlch
closes
the by-pass
hole
when li opens and dlrects
lhe coolan+
(C)
Into fhe
radlalor.
These
englne
lFdels do no+
have
separat€ r Inter-+yp9 thermosia+s.
C@l ant
purP
The coolanl
purp
ls a
can+rltugal
pump
llxed
io
ihe
cyllnder block
tronf
face.
The
purp
ls
drlven by lhe cr€nkshali bel+
pulley
+hrough
the
v-belt.
The J09, 3ll and
411
englnes
have
+he
pump
shat+ and bearlngs ös
an Iniegrated
unl+ or +he
pump
ls equlpped rl+h separate
bal I
bearlngs.
In 6ll and 612 englnes
fhe
coolanf
pump
ls furnlshed llilih
separafe
ball bearings.
The lmpel ler ls flxed
fo
the shaf+ wl+h
pressed-on
fl+. The €xlal seal on
the
pump
body
and the
ceramlc counter rlng
rolailng on ihe
shaft take care of lhe seallng. The
pump
body
has
connectlons
tor the fluld clrculailon
of
the
heatlng
devlce
ond
ihai of ihe oll cooler.
The f09 and
fll englnes
also
höve
a connectlon
fot'
ihe b
lock
hoaier.
Coolan+ pump,
separate
4ll
anglnes.
l.
Locklnq rlno
l!
Eeartng
f. Bush
4.
Shali
5.
Shafi
sea
I
6.
Orease
nlpp
le
7. Body
8.
Seöllng
rlng
9. Plug
10.
Axlal
seal
ll.
lmpel ler
7-4
ba | |
be6r Ings, ll I
and
12. Gaskei
lf. Back plate
14.
Hexagon
screw
15.
Hexagon
nu+
16. Washer
I 7.
Bel+
pu
I ley
18.
Key
19. Hexagon
screw
20.
Connec+or
21.
Seallnq
rlno
ZZ. \jasKei