Valmet 309 - Page 73

CML
I
NG SYSIEi,I
CONSTRT'CT
ION
lh€ripstct
109, lll rnd
4ll
Thermosta+ hous I n9
tll and
l.
Hexagon
sockg+ screr
2. Return
plpe
5. Gäskel-
4.
Therrpsiat
5. Thermostai
houslng
Cool Ing
sy3tdtr
4ll
l. Thernos+ai
2. By-pass
plpe
5. Rad i a+or
4.
C@l ant
pump
The
cool
lng
sysiem ls lllustral'ed
ln flg.
7
l.
The coolant
punp
(4)
sucks
fhe
coolant
trom th€
undersld6 of ihs rödlator
(J)
and
Dressos
lt
Inl-o thg
c@llng
jackei
surroundlng
the
cyllnders In th€ cyllnder block.
Through
the
holes In
ihe
cyllnder block
+op face th€
coolani rlses Into ihe cyllnder head
änd
fur+her onto
th€ thernoslai
(l
). 6l I and 612
englnes have a s€pärate c@lant
ouilef rall to
dlrect
the coolant from the cyllnder heads lnfo
the
thernostEt houslng.
l{hen the
englne runnlng
iemperaiure ls lorar
than ihe
apenlng
teiperature
of
ihe th€rmosta+
+he
c€olani relurns
fhrough
the
by-pass
(2)
siralghf Inio lhe
coolont
punp
and
then
back
Inlo +he eng|ne.
l{hen the
englne
runnlng iemperature rlses
up
to
the ihermostot
control ronge
ihe thermostät
opens, letllng
pori
ol the
c@lan+
clrculåte
+hrough fhe radlöior
ond
part
+hrough ths
by-pass. l{hen
the thermosta't ls
lully
apon
lt
closes +he
by-pcss
plpe
(no+
J09 englne) and
+hs
coolani
flo|.s
through
ihe radlaior only.
The by-pass arrongemgn+ ensures a steody
ieDpera+ure
In
gnglne
under all clrcumstanc€s.
C@ I cnt
Ths coolani us€d
ls o
nlxtura o{
glycol-basgd
antl{reeze änd water rhgre ihe
DroDortlon of
ihe
antlfr€€ze ls
l0 to 50 t. Due to l+s antl-
corros lve
qualltles
the
anilfre€ze should
b€
used In
the
su igrilne
as rell. Chönge the
coolant
every
fro
years.
Never use
plaln
rc+er
as
c@l ant I
4l I
6. Hexagon socket
screr
7.
Gaskei
8. By-pass
p
lpe
9.
Gosket
The J09. englne
has c
nornal
slngle-acilng
lhornpstat.
The
theritost6i ln the
lll änd 4li
englnes
ls the
so-cclled double-actlng iype
{hlch
rogulafes ihe
cooloni
clrculailon
betr€€n
the
by-pass and the
rödlator.
The thernpstat
ls
placad
ln
a
houslng
flxed to
the cyllndsr
head tron+ face.
The by-pass
plpe
}rlth
lts
gaskel
lles beir€en ihe +hermostaf
houslng and
ihe
coolanf
pump.
The
+herflpstaf
opgns
ai
ihe
temperoture
of 7fC. In rlnigr
o
ihermostat
vrlth
of|enlng +enperature
of
85
o
C can be used.
Thorrpstct
6ll cnd
612
7-3