Bentley R Type - Chapter IX: Engine Cooling System; Coolant

EncrNB
CoorrNc SysrBna.
79
CHAPTBR
IX
Engine
Cooling System
Coolant-Coolant
Pump
and,
Fan-Fan
Belt Adjwstment-Oaerheating
-Engine
Thermostat-Radiator
Mounting-Frost
and Anti-freeze
Mixtures-Car
Heater.
Goolant.
The cooling system
is filled
with a
zS
per
cent. mixture
of inhibited
ethylene
glycol
and water
before
the
chassis leaves
the
factory,
and it
is strongly
recommended
that
this,
or a similar
anti-freeze
mixture,
is
used
all
the
year
round,
both summer
and winter.
The
purpose
of
this is not
only to provide protection
against
frost
during the
cold
weather,
but also to prevent
any corrosion of
the
coolant
passages
and subsequent
deterioration
in
the
standard
of
cooling,
If
there is
any abnormal loss
of coolant,
the cause should
be
ascer-
tained and rectified,
and
the system topped
up with
the correct
anti-freeze
mixture
to
maintain
the
level
to
the bottom
edge
of
the
filling
orifice.
If
either of
the
recommended
compounds (see page
Bz) are
not
available,
plain,
preferably
soft, water
may
be
used
when there is
no
danger of
frost.
The radiator filler
is
located
under the
left-hand
side of
the bonnet.
A
warning notice is
embossed on
the
cap
to
the
effect
that it
must
not
be
removed
when the engine
is
running.
Hot
coolant
is likely
to
be
forced out in
such
circumstances.
A drain
tap
is
situated on
the
pipe connecting
the pump
with
the
bottom
of
the
radiator.
It is in the
"off"'position
when
the handle
is
pointing
downwards.
On
no account
must
any
strong
alhaline
compound
be wsed
to clean
out
the
coolant system.
Seaeral
swch
compounds
are aaailable,
but
their
use
must be
carefully
auoided, owing
to theiact that they
haae a
d.etrimental
chcmical,
action on
al,uminium.
It
is very
important
that
a
glycerine.base
compound
should
not be
mixed
with
a
glycol
base
compound,.