MG MGB User Manual

THE
COOLING
SYSTEM
C
Section C.9
DRAINING
AND
REFILLING THE
COOLING
SYSTEM
(GHNS
and GHDS
cars
from
Car No.
410002)
Draining
1.
Stand
the
vehicle
on
level
ground.
2. Remove
the expansion
tank
cap
and the
filler
plug
from
the
coolant
outlet
pipe.
3. Slacken the hose
clip and
disconnect the
bottom hose
at
the radiator.
4. Remove the
cylinder
block drain plug.
Filling
5. Refit
the
bottom
hose
and cylinder
block drain
plug.
6. Check
that
all
hose connections
are
tight.
7. Turn the heater
temperature
control
knob
to
‘HOT’
to
open
the
heater
valve.
8. Top
up
the
coolant
in
the expansion
tank
so
that
the
tank
is
half-full and
refit
the
cap.
9.
Fill
the
system
through the filler
neck and bring
the
level
up
to
the bottom
of the
threads.
10. Refit the
filler plug.
ll. Run
the
engine
until the
top
radiator
hose
is
warm
and switch off the
engine.
l2.
Turn the
expansion
tank
cap
to
its
safety
stop
to
release
the
pressure
and if
necessary
top
up
the
expansion
tank
to
half-full. Refit the
cap.
l3. Remove the
filler plug and
top
up once
more
to
the
bottom of
the
threads. Refit
the
filler
plug.
Section C.10
WATER
PUMP
(GHNS
and GHDS
cars
from
Car No.
410002)
Removing
1. Drain
the cooling
system,
see
Section
C9.
2. Disconnect
the
alternator multi—connector
plug.
3.
Remove the alternator
securing
bolts.
4. Remove
the
alternator
and
drive
belt.
5. Slacken
the
retaining
clip
and disconnect the radiator
bottom
hose
from
the
water
pump.
6.
Remove the
screws
securing
the
water
pump
pulley.
7. Remove the
spacer
and
water
pump
pulley.
8.
Remove the
bolts
securing
the
water
pump
to
the
cylinder
block.
9. Withdraw the
water
pump
and
joint
washer.
Refitting
lO.
Reverse
the procedure
in l
to
9.
noting:
MGB.
a.
Fit
a
new
joint washer.
b. Torque tighten the
water
pump
securing
bolts
to
the
figure
given
in
‘GENERAL DATA’.
c.
Adjust the drive
belt
tension
to
the
figure
given
in
‘GENERAL
DATA’.
Issue1.
91427
Section C.11
RADIATOR
(GHNS and GHDS
cars
from
Car
No.
410002)
Removing
1.
Drain the
cooling
system.
see
Section (‘9.
2. Slacken the
hose
clip and disconnect
the
top
hose
at
the radiator.
3.
Slacken the clip and disconnect
the
expansion
tank
hose
from the
radiator.
4.
Disconnect
the thermostatic
switch
wires
connector.
5.
Remove the
screws
securing
the radiator
to
the
mounting
bracket.
6. Slacken the
screws
securing
the radiator mounting
bracket
ties
to
the
bonnet
lock platform and swing the
ties
to
one
side.
7. Ease the
radiator towards the
front
of
the
vehicle and
withdraw the radiator
from the
engine
compartment.
Refitting
8. Reverse the
procedure
in
l
to
7.
Section
C.12
Removing
1.
Remove
the radiator
fan guard
from the
bonnet
lock
platform.
2.
Disconnect
the fan
motor
wires
at
the
multi-connector
plug.
3.
Slacken
the
grub
screw
retaining
the
fan
blades
to
the
motor
spindle.
4,
Withdraw the
fan blades
off the
spindle.
5.
Slacken
the
two
screws
clamping the
fan
motor
bracket.
6.
Withdraw the
fan
motor
from the
bracket.
Dismantling
7. Remove
the
two
through—bolts.
8. Withdraw the
end
cover
complete with
armature
from
the
motor
yoke,
noting
the
assembly marks
on
the
end
cover
and
yoke.
9.
Remove the
circlip from
the
armature
spindle and
withdraw
the
two
shims
and
the
bowed washer.
10.
,
Withdraw
the
armature
assembly from the
end
covers
ll. Withdraw the thrust
washer
from
the
armature
‘
spindle.
V
12. Remove the
circlip from the
armature
spindle.
l3.
Remove the three
screws
to
release the brush
carrier
assembly from
the
end
cover.
Inspection
14.
Check
the
brush length,
minimum
length 1%
in
(4.76
FAN
MOTOR
(GHNS
and GHDS
cars
from
Car No.
410002)
mm),
renew
the brush
gear
if
necessary.
If
the brush
leads
are
renewed,
ensure
that the
black
lead
is
connected
to
its
correct
brush and
connector
pin.
C.11

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English