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c
THE
COOLING
SYSTEM
Fig.
C.
l
Tlte cooli11g sysrem
lteader rank ir po.ririoned abore
rhe exltausr
ma11ijold
an
rite
lefr-hand
sitle tif
rite
engine.
Remo1~
lilt'
r
ap
slowly
if
tlte
tmgine
is
/tor
DESCRlPTION
The
cooling
system
is
sealed,
und
the
water circulation
is assisted by a pump
attached
to
the front of the engine
and driven by
a
belt
from
the
crankshart.
The
water
circulates from the base
of
the
radiator
and passes
around the cylinder
head to
the
separate
header
tank
mounted above the
exhaust
manifold
before
reaching
the radiator. The
cylinder
block
is cooled
by thermo-
siphon action. From
the header tank
the
water passes
down the radiator
core
to
the
base tank of the
radiator.
Air
is
drawn
through
the
radmtor
by
a
fan
attached
to
the water pump
puUey.
The
thermostat
is set to
open
between
SO and
ss•
C.
IMPORTA.-.:T.-
'
ever
use
a
muff on
the radiator
grille
to proteet
the
rool~
S)stem
in
oold
"eatber
as tbis
would seal tbe
earbureuu
and
heater unit
air
s uppl'
'·
Tbe
radiator
must
be
proteded
by
a blind
sucb
a~
the
type
:nailable
as an
optional
extra
fining.
Section C.l
REMOVlNC
TH.E
FILLER CAP
The cooling
system
is under
appreciable pressure
while the engine
IS
hot
after a run,
a
nd
the
header
tank
filler
cap must be removed very
carefully
or
left
in
position
until the water
has cooled.
lf
it is necessal"y to
remove
the
filler
cap
when the
engine
is hot
it
is absolutely
essential
to remove it
gradually,
and
the filler spout
is
provided
with
a
specially
shaped
cam
to enable
this to be done easily.
Unscrew
the
cap slowly
till
the
retaining
tongues
are
felt
to engage
the
small lobes
on
the end of
the
filler
C.2
spout
cam,
and v.'3it
until the
pressure in
the
system is
fully
released before
finaUy removing the cap.
It is advisable
to
protect
the hand against esc:1ping
steam while removing
the cap.
Section C.2
DRAIM
:
- .:G T
HE
COOUNG SYSTEM
Remo>e the
header tank filler cap.
Open
the two
drain
taps.
One
•s fitted
on the
right·
hand side
of the base of
the
radiator
and
the
oth~r
at
the
rear of
the cylinder block
on tbe
right-band
side.
NOTE.-H
anti-freeu
mixtwe
is beiag used it
sboold
be
drained into a Sllifable container and
carefully presen ·ed
rue
replacement.
Section C.3
FlLLL
'IG
T
H£
COOUNG SYSTE.'\'
1
Oose the radiator and cylinder block drain taps.
Ensure
that the water
hose
clips are
tightened.
Fill up the system through the fiUer
in the
header
tank
until the coolant
level
is
approximately
1
in. (6·3
mm
.)
below the bottom
of
the filler neck.
When possible,
rain-water
should be
used
in
the
syst<m.
Avoid overfilling to prcv<nt
loss
of
anti-freeze due
to
expansion.
Screw the
filler cap firmly into
position.
Tbe
cooling
system
is
unsuitable
for
llSC
>titb anti-
freeze mixtorcs bavillg "" aloohol base,
owing
to
the
bigll
temperatures
auained.
Only
anti-frceu mixtures
or
tbe
elhyleoe
glyool or gly<Uine type
sboald
be
employed.
(Sft
Section
C.6.}
Fig.
C.2
111e
radiator
drain tap
is positioned beneath
rile
radiator
on the right-hand
side
MCA
(T,.in
Com). ls.$ue
2.
19422
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