Ms-Royce Silver Shadow
8
Bentley
T
Series
Workshop
Manual
Chapter
L
0
l
Introduction
The cooling system must
be
filled with a
50%
mixture
of anti-freeze and water. This should be renewed
annually.
A
thermostat valve is fitted in the coolant outlet
pipe between the engine and radiator header tank
This
valve prevents circulation of the coolant through
the radiator until the engine has reached normal
operating temperature.
Coolant temperature
is
detected by a transmitter
mounted on the thermostat housing and on earlier
cars,
recorded on a gauge situated on the facia Later
Silver Shadow cars had the gauge deleted and an
illuminating warning panel fitted The Corniche
continued to be fitted with the single instrument
mounted on the
facia
A coolant level probe situated in the header tank
will illuminate the warning
panel (or an amber lamp
on earlier cars) if the coolant drops below the required
leveL
Three drainage points are provided in the system.
A tap at the bottom of the
radiator(see
Fig.
L
1)
and
a drain plug on each side of the cylinder block
(see
Fig.
L2).
On cars produced prior to car serial numbers,
SRX
3200
(Standard) and CRH
3315
(Coachbuilt),
drain taps are fitted to all three positions.
Section
11
GENERAL INFORMATION
important
The cooling system is pressurised
Do not
remove
the radiator filler cap while the engine is running or
when the engine is hot, otherwise internal pressure
will blow out the hot coolant If it is necessary to
check the level of the coolant when the engine is hot,
muffle the filler cap with a thick cloth. Gradually
turn
the cap anti-clockwise until the pressure is
reduced, then remove the cap.
Corrosion and freeze protection
For protection against frost and corrosion, the
cooling system must be filled with
a
solution of
50%
prescribed anti-freeze and
50%
water.
The mixture should be renewed annually.
The trade names of the anti-freezes that may be
FIG.
M
RADIATOR AND CONNECTING PIPEWORK
1
Header tank to radiator
2
Pump
to header tank
3
Radiator to thermostat
4
Gearbox oil cooler pipe
5
Radiator to
pump
used are
UT
184 (BP-Hythe Chemicals) or Prestone
11.
The former is used predominantly in Europe and
the latter in North America. Both are summer
coolantlanti-freeze solutions and are miscible, but
must not
be mixed with any other brand of anti-
freeze.
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