MG MGB User Manual

C
THE COOLING
SYSTEM
of the radiator. On 18GD
and
18GG
engines
the
engine
cylinder block drain
tap
is
replaced
by
a
removable plug
and
sealing
washer.
LATER CARS
Later
cars
have
no
provision
for
draining
the radiator
and
the
use
of anti-freeze
all-the-year
round
is recommended.
To
drain the coolant from
the radiator,
slacken the
radiator
bottom
hose
clip
and
remove
the hose
at
its
connection
to
the
radiator.
When the
system
is
completely drained
and refilling
is
to
be
deferred
until
some
later date
a
suitable
notice
should
be
■xed
to
the
radiator
filler
cap,
indicating
that
the coolant
has
been
drained.
As
an
alternative,
place the
radiator filler
cap
on
the driver’s
seat
or
leave
the
■ller
cap access
panel
open
as a
reminder
to
fill
the
cooling
system
before
the
vehicle
is
used
again
NOTE.-~If
a
heater is
fitted,
under
no
circumstances should
draining of the
cooling
system
be
resorted
to
as an
alternative
to
the
use
of anti—freeze
mixture, due
to
the fact
that complete draining
of the heater
unit by
means
of
the
cooling
system
drain
taps
is
not
possible.
To
ensure
suf■cient
circulation of
the coolant
and
to
reduce
the
formation
of scale and
sediment
in
the
radiator
the
system
should be
periodically flushed
out
with clear
running
water,
preferably
before
putting
in
anti-freeze
solution
and
again
after taking
it
out.
The
water
should be allowed
to
run
through
until
it
comes
out
clear
from the
taps.
This method
is
adequate under normal
conditions,
but
in
extreme
cases
where
excessive
‘furring
up’
is
experienced
a
more
efficient
method
is
to
completely
remove
the radiator
and ■ush
in
the
reverse
way
to
the flow,
i.e.
turn
the
radiator upside-down
and let the
water
flow
in
through
the
bottom hose
and
out
of the
top
connection.
'
Filling
the cooling
system
Close the radiator
and cylinder block drain
taps.
/////
lllllllllllll
\llli
Fig.
02
The location of
the radiator drain
tap
(Early
cars)
_c.8
Ensure that
all hose
connections
are
tight.
Fill
up
the
system
through
the filler
in
the
radiator header
tank
until the
level of
water
can
just be
seen.
Run
the
engine
until
it is
hot
and
then
add
suf■cient
water
to
raise
the
level
to
within
1 in.
(25.4mm.)
of
the
bottom of
the
filler
neck.
When
possible, soft
water,
such
as
clean
rain-water, should
be
used
to
fill
the
system.
When
using
anti-freeze
solution
avoid over■lling
to prevent
loss
from
expansion.
Anti-freeze
solutions
having
an
alcohol
base
are
unsuitable
for
use
in
the
cooling
system
owing
to
the high
temperatures
attained
in
the
top
radiator
tank.
Only
anti-freeze
solutions of
the
ethylene
glycol
type
incorporating
the
correct
type
of
corrosion inhibitor
should
be
employed. (See
Section C8).
Section
C5
FAN
BELT
To fit
a new
fan
belt slacken
slightly
the
two
bolts
on
which
the dynamo
pivots
and release
the
bolt
securing it
to
the
slotted link
and the
nut
securing
the
slotted
link
to
the
engine.
Move the
dynamo
to
the
engine
as
far
as
possible.
Slide
the belt
over
the fan
and
onto
the fan
pulley;
ease
the
belt
onto
the
crankshaft
pulley
and dynamo
pulley.
It
may
be found
helpful
to turn
the
engine
with the
starting-handle
whilst
easing
the
belt
over
the
dynamo
pulley.
Adjustment
is
made
by
raising
the dynamo
upwards
away
from
the
engineA
gentle
hand
pull only
must
be
exerted
on
the
dynamo,
or
the belt
tension will be
excessive and
undue
strain will
be thrown
onto
the
dynamo
bearings.
Tighten
up
the bolts
with the
dynamo
in
this
position.
The
belt should
be suf■ciently tight
to
prevent
slip,
yet
it
should
be
possible
to
move
the
belt laterally
1 in.
(2.5
cm.)
in
the
centre
of
its
longest
run.
On
cars
■tted
with
alternators the
fan
belt
is renewed
and
adjusted
in
a
similar
manner.
Section
C.6
RADIATOR
AND DIAPHRAGM
The
radiator block
assembly
is supported
in
a
metal
diaphragm
which
is.secured
to
the
body
sides
by
screws
and
washers.
The
diaphragm
has
two
holes
in
the
right-hand
side
to
permit
the
oil
cooler
pipes
to
pass
from
the cooler
to
the
engine. A rubber
air
seal
is
■tted
across
the
top
channel of
the diaphragm.
The
radiator
is supported
in
the
diaphragm
by three
screws
and
washers
each
side
and
a
tie-bar
running
forward
from
each
top
screw
to
the body
sides.
The
over■ow
pipe
is secured
by
two
clips that
are
retained
by
a
radiator ■xing
screw
and
a
diaphragm ■xing
screw
respectively.
MGB.
Issue5. 80619

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English