Bentley R Type - Engine Thermostat; Frost and Anti-Freeze Mixtures

ExcrNB CoorrNc
Svsrnu.
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(c) There
may
be a shortage
of coolant
in the
system.
(d) Detonation
and
poor
grade
of
fuel.
(.) Radiator
matrix
blocked
with flies
or dirt,
etc.
Engino
Thermostat.
The
thermostat
which
controls
the
flow through
the
radiator
to
suit
the
engine
cooling
requirements
is
contained
within
a casing
(6,
Fig.
37).
It
is
arranged
to
maintain
a minimum
coolant temperature
of
approximately
78"C.
Reference
to
the
instrument-board
thermometer
will
indicate
that
the thermostat
is operating
correctly
and that
there
is no shortage
of coolant.
An
unusually
and
consistently
low
temperature,
after the engine
has
been
well
warmed
up,
indicates
failure
of the thermostat.
A
by*pass
pipe acts to short
circuit
the
radiator when the
thermoslal
valve
is
closed
or only
partly open. This
arrangement
ensures
a
quick supply
of
heat to
the
induction
pipes a-fter
sta_rting
from
cold
as
well
as a
rapid warming
up of the engine
coolant
jacket.
Radiator
Mounting.
The
radiator
comprises
two
main
units, namely, the
outer shell
and
the
matrix
itself, the
complete
assembly
being
mounted
on
a
single
central
rubber
support.
The
shell
is
diagonally
braced
and
is bolted
to the
wings
and
valance
plates.
The
radiator
matrix
is
secured
in
the
shell
at
tfiree
points, which
are arranged
to
proVide freedom
for
expansion
under
heat.
The
object
of
this special
construction
is to avoid sidewaVf move-
ment
of
the
radiator
assembly
due to
road shocks,
and to
isolate
the
matrix
from such
shocks.
No
lubrication
or
attention
is necessary
in
connection
with
the
mounting.
Frost
and
Anti-Freeze
Mixtures.
As
long
as
the original coolant
is
maintained
in
the
system,
no
precautions
need
be taken
against frost.
If, for
any
reason,
the original
coolant has
been replaced with
water,
then the
system
must
be drained
if
the
car
is
to
be
left
exposed
to
temperatures
below
3zo
F