Bentley R Type - Coolant Pump and Fan; Fan Belt Adjustment; Overheating

TnB
'R'
TypB BBNrrBy.
Coolant Pump
and Fan.
The centrifugal
coolant
circulating pump
is
mounted
in
tandem
*i!h
the
fan,
on
the front part
of
the cylinder block,
and is
driven
by
a
"V"
belt,
which
also
drives
the dynamo, from
the
front
end of
ihe
crankshaft.
It
is improbable
that
any
leakage
or any other
trouble will
be
experienced
over long periods
of
running,
and no attention
should
be
necessary between
general
overhauls
of the
chassis.
If,
for any
cause,
the engine
has
to
be
run with
the
fan
removed,
it is
essential
that
the
fan
retaining
set-screws,
with
suitable
distance-
pieces
to allow
for
the thickness
of
the fan, are refitted
in position.
Fan Belt Adjustment.
Normally
the belt
should
not require
adjustment.
An
adjustment
is
pro_vrlfe{.
however,
and
is
effected
by releasing
the three
nuts
(9,
4
and 5,,
Fig.
37), and
moving
the
dynamo
outrvards
on
the
special
slotted link.
The tension
should
be
such
that
the fan
belt
can
be
moved
transversely,
with the fingers,
at
a
point
equidistant
from
the
crank-
shaft pulley
and
the
fan
pulley
through
a
total
distance
of one inch.
If
it
should
be necessary
to remove
the
belt
for
any
reason, it
must
not
be
strained
over the pulley.
The three nuts
(8,4
and 5),
should
be
released
and
the
dynamo moved
upwards
to
the
full
extent
of
the
slot,
when
it
will be
found
that
the belt
can be
easily
replaced
without
straining.
The
fan
must
not be
forcibly
turned,
by lmnd
as
this will cause
bending
of
the blades
and
may
result
in
a damaged radiator.
overheating
may
be
due
to one
or
more of
the
following
causes:-
(a)
The
thermostat
may
have
failed.
(b)
The fan
belt
may
need
adjustment,
Jig.
37.-THE FAN
BELT ADJUSTMENT.
1.
Dynamo.
2.
Slotted
link.
3, 4,
5. Securing nuts.
6, Thermostat.
Overheating.