MG MGB User Manual

THE
CLUTCH
E
into
the
feed
holes
drilled around
the
head
of
the
piston.
The
outer
end
of the
piston
carries
a
secondary
cup
and
is
formed
with
a
depression
to
receive
the spherical end
of
the
push-rod
assembly.
The
push-rod has
a
piston
stop
that
is
retained
in
the body by
a
circlip.
A
rubber
boot
through
which the
push-rod
passes
is
■tted
to
the
end
of the body.
At
the
opposite
end
of the
barrel
to
the push-rod
an
end
plug
screws
down against
a
gasket. This plug
forms
the
outlet
connection
for the
pipe
line
to
the slave
cylinder.
Removing
Remove
the
screws
securing
the
brake and
clutch
master
cylinder
cover
and
take
off the
cover.
Drain
the
■uid from
the
supply
tank by
attaching
a
rubber
tube in
the
bleed
screws
in
the
Clutch slave cylinder,
opening
the
screw
one
full
turn
and
then depressing
the
clutch
pedal.
Hold
the pedal
down and
then
tighten the
screw
and
then let
the
pedal
return
unassisted. Repeat
this operation
until
the
tank
is
empty.
Remove
the
split
pin,
washer,
and clevis
pin
from
the
push-rod
and disengage
the clutch
pedal lever.
Clean
the
pipe
connection,
disconnect
the
pipe
line, and
fit
a
plug
to
the
end
of the cylinder
to
prevent
the
entry
of
dirt.
Unscrew
the
fixing bolts
and
detach the
master
cylinder
from
the
box
assembly.
Dimantling
Detach the
rubber boot
from
the
barrel.
Depress
the
piston
to
relieve
the
load
on
the
circlip, then
remove
the
circlip
and the
push—rod
assembly.
Withdraw
the
piston, piston
washer,
main
cup,
spring
retainer,
and
spring.
Remove
the
secondary
cup
by
carefully stretching
it
over
the
end of
the
piston.
Examination
Place all
metal
parts
in
a
tray
of
clean
Clutch and Brake
Fluid
to
soak.
Dry
them
with
a
clean,
non-■uffy
cloth.
Rubber
components
are
to
be
examined for
swollen
or
perished
cups
or
other
signs
of deterioration.
Any
suspect
parts
must
be
renewed.
Swill the
main
castings
in
industrial
methylated
spirit
and
thoroughly dry
out
before assembly.
Ensure
that
the bypass
ports
are
free of obstruction.
The
port
is
drilled
with
a
t
in.
(3.17
mm.)
drill
for half
its
length and
then
■nished with
a
.028 in.
(.711
mm.)
drill.
Assembling
Dip
all
components
in
Clutch and
Brake Fluid and assemble
when
wet.
Stretch
the
secondary
cup
over
the
piston
with the lip
of
the
cup
facing the
head
of the
piston.
When the
cup
is in its
groove
work
it
round
gently
with the
fingers
to
ensure
that
it is
correctly
seated.
MGB.
Issue3.
65891
Insert
the
return
spring,
largest
diameter
■rst,
into
the
barrel and
position
the
spring
seat
on
the small-diameter
end
of the
spring.
Assemble
the
main
cup,
piston
washer,
piston,
and push-
rod. When
assembling
the
cups
carefully
enter
the lip edge
of the
cups
into
the barrel ■rst.
Depress
the
piston,
position
the
piston
stop,
and
retain it in
the barrel
with the circlip.
Place
the rubber boot
in position
and
■t
the dust
excluder.
Replacing
Refit
the
master
cylinder
to
the
master
cylinder box
and
secure
it
with the bolts. The long
bolt
passes
through the
stiffener plate.
Remove
the dust excluder and
■t the
pipe connection
to
the
master
cylinder.
Re■t the clutch pedal lever
to
the push-rod
and
secure
it
with the clevis
pin,
washer, and
a new
split
pin.
Refit the
master
cylinder
cover.
Fill the
master
cylinder and then
prime
and bleed
the
system.
Section
E.4
SLAVE
CYLINDER
The slave
cylinder
incorporates
two
threaded
connections
for the
feed
hose and
the bleed
screw
and
accommodates
in
the body
a
piston,
a cup,
and
a
spring.
A
rubber
boot
through which
passes a
push-rod
is
fitted
to
the body
and
is
retained by
two
clips.
The
push-rod has
an
eye-end
which
connects
with
the clutch
withdrawal fork.
Removing
Drain
the
system
as
described
in
Section
E.3.
Release
the feed
pipe
from the cylinder and
remove
the
two
screws
securing
the cylinder
to
the clutch housing.
The
cylinder
may
be
withdrawn, leaving
the
push-rod attached
to
the clutch withdrawal
fork,
or
the rod
may
be
detached
from
the fork.
Dismantling
Remove
the rubber dust
cover
and
with
an
air
line blow
out
the
piston
and seal.
Extract
the
spring
and-cup
filler.
Examine all
components
and
renew
any
that
are
suspect.
Assembling
Place
the
spring
in
the
cylinder,
followed
by
the
filler,
cup,
and
piston.
Depress
the
piston
with the push-rod and
re■t
the rubber boot. Secure
the boot
to
the rod with the small
clip
and
then
■t the
boot
to
the
cylinder and
secure
it
with
the large circlip.
E.5

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English