drive when the
temperature
of
the cooling water
reaches
185"F,
and switch off again
when the
temperature
of
the water falls to
167oF.
2 lf the fan fails
to
take up the drive at the specified
temperáture, check the Íuse F3 under
the
dashboard.
3 lÍ the fuse has not blown, bridge
the terminals of the
thermoswitch, located at the bottom of the radiator,
with a
jumper
wire.
lf the fan
now
takes
up
the drive,
the thermo-switch is faulty and should be renewed.
The thermo-switch tightening torque
is
21
,6
to 36.1
lb Ít.
Thermostat:
The thermostat
plug
on the exit
side of the water
pump
prevents
cold water from
passing
into the top tank
of the
radiator.
The
water is then
recirculated
through the
engine
until it
is hot enough
to
open the thermostat valve,
thus
giving
a
quick
warm
up.
The thermostat
can be tested
by immersing
it in water
so that it
does not touch
the bottom
or sides
of
the
con-
tainer. Ïhe temperature
of the water
is
raised
until the
thermostat
valve
starts to
open.
lÍ
the
valve
does not
open at the
specified temperature,
or
sticks in the Íully
open
position
it must
be
renewed.
lt
is not
possible
to
repair
a defective thermostat.
Two types
of
thermostat
are manuÍactured
and can be
identified
by
a reference number
and
by
the
colouring.
The thermostat
Íor normal
use is
coloured red
and
numbered
951. The valve in
this model
starts to
open at
72oC
and is fully
open
at 80oC.
For
'deep
frost'
countries a thermostat
reference
944
and coloured
black
is
fitted. The valve
in this model
starts to
open
at 88"C
and
is fully
open
at
97oC. The
thermostat
is
shown in FIG 4
:12.
4:7
Fault
diagnosis
(a)
Internal
water leakage
1
Cracked
cylinder
wall
2 Loose
cylinder
head
nuts
3 Cracked cvlinder
head
4 Faulty head
gasket
5 Cracked tappet
chest wall
(b)
Poor
circulation
1 Radiator
core blocked
2
Engine
water
passages
restricted
3
Low
water level
4 Loose fan
belt
5
Defective
thermostat
6
Perished
or collapsed
radiator hoses
(c)
Corrosion
1 lmpurities
in the water
2
Infrequent
draining
and
flushing
(d)
Overheating
1
Check
(b)
2 Sludge in crankcase
3
Faulty
ignition
timing
4 Low
oil level in sump
5
Tight
engine
6
Choked
exhaust
system
7 Binding
brakes
8 Slrpping clutch
9
Incorrect
valve
timing
10 Retarded ignition
11
Mixture too weak
P404
41
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