Rolls-&yce Silver Shadow
B
Bentley
T
Series
Workshop
Manual
Chapter
1
Thermostat
-
To remove (see
Fig.
14)
1.
Drive the car onto a ramp.
2.
Firmly apply the handbrake/parking brake
and remove the gear range selector thermal cut-out
from the fuseboard.
3.
Drain the coolant as described in Cooling
system
-
To drain, Section L1.
4.
On cars fitted with exhaust emission control
equipment it will be necessary to disconnect the
cable to the primary valve lock-out switch and,
dependent on the car's domicile, to remove the air
diverter valve. Refer to Chapter
U
-
Emission
systems, for removal and fitting of exhaust
emission control components.
5.
Remove the setscrew to the air intake elbow
bracket then the two setscrews securing the
bracket to the thermostat cover and release the
bracket.
6.
Unscrew the remaining two setscrews
securing the thermostat cover to the housing and
move the cover to one side; the hose being
sufficiently flexible to allow the desired movement
without having to be removed.
7.
Remove the heat exchanger water connection,
if fitted.
8.
Lift the thermostat from the housing.
Thermostat
-
To test
If the thermostat is suspected of being faulty, it
can be tested as follows.
1. Suspend the thermostat and the bulb of an
accurate thermometer into a container of water so
that they are completely immersed. They must not
be allowed to touch the sides or bottom of the
container as this would cause a false reading.
2.
Gradually heat the water, stirring contin-
uously to ensure that the water and thermostat are
at a uniform temperature.
3. Note the temperature at the point when the
thermostat valve begins to open.
If the water is heated too quickly, or if it is not
adequately stirred, a false reading may result.
The thermostat has its opening temperature
Section
13
THERMOSTAT
FIG.
14
THERMOSTAT AND HOUSING
A
Early cars
B
Late cars
stamped on the base of the unit, for example,
80°C. (190°F.).
When fully open, the valve should have
travelled a minimum of 9,5 mm. (0.375 in.).
No attempt must be made to adjust the thermo-
stat.
4.
Check that the fusible plugs are intact.
Thermostat
-
To fit
1. Remove the old gasket material from the
thermostat housing and cover, ensuring that no
material enters the thermostat housing.
Check that the two faces are wiped clean.
2.
Fit a new gasket and insert the thermostat
into its housing.
3. Replace the cover and secure in position by
progressively tightening the four setscrews.
4.
Examine hoses for deterioration and ensure
all worm drive clips are secured. Renew any
hoses that are unserviceable.
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