MG MGB - Hub and axle shaft; Renewing the pinion oil seal

THE
REAR
AXLE
AND
SUSPENSION
H
Remove
the
bearing
spacer.
Knock
back
the
tab of
the
locking
washer
and
unscrew
the
nut
with
a
suitable
spanner.
Tilt the
lock
washer
to
disengage
the
key
from
the
slot
in
the threaded
portion of
the
axle
casing;
remove
the
washer.
The
hub
can
then
be
withdrawn
with
a
suitable
puller
such
as
Service
tools
18G
304
and
18G
304
A. The
bearing
and
oil
seal
will
be
withdrawn
with
the
hub.
Before
assembly,
repack
the
hub
bearings
with
grease.
The
bearing
is
not
adjustable
and
is replaced
in
one
straightforward
operation.
When
reassembling
it
is
essential
that
the
outer
face
of
the
bearing
spacer
should
protrude
from
.001
in.
(.025
mm.)
to
.004
in.
(.102
mm.)
beyond
the
outer
face
of
the
hub
when
the
bearing
is pressed
into
position.
This
ensures
that
the
bearing
is
gripped between
the
abutment
shoulder
in
the
hub
and the
driving
■ange
of
the
axle shaft.
Section
H.3
RENEWING
THE
PINION
OIL
SEAL
Mark
the
propeller
shaft
and
the
pinion driving
■anges
so
that
they
may
be
replaced
in the
same
relative
positions.
Disconnect
the
propeller
shaft.
Knock
back
the
lock
washer
and
unscrew
the
nut
in
the
centre
of
the
driving
■ange.
Remove
the
nut
and
washer
and
withdraw
the
■ange
and
pressed-on
end
cover
from
the
pinion shaft.
Extract
the
oil
seal from
the
casing.
Press
a
new
oil
seal
into the
casing
with
the
edge
of
the
sealing
ring
facing
inwards.
Replace
the
driving
■ange
end
cover,
taking
care
not
to
damage
the
edge of
the
oil
seal.
Tighten
the
nut
with
a
torque wrench
to
a
reading
of
1401b. ft. (19.34
kg. m.).
Fig.
H.3
Use
Service
tools
18G
134
and
18C
134
P
to
drift
the
hub
into
position
MGB.
Issue
6.
82448
A559$W
Fig.
H.4
Use
Service
tool 18G
47
C
and
adaptor
18G
47
T
to
remove
the
differential
bearings
Reconnect
the
propeller
shaft,
taking
care
to
fit
the
two
■anges
with
the
locating
marks
in alignment.
Section
H.4
REMOVING
THE
DIFFERENTIAL
PINIONS
Drain
the
oil from
the
axle
casing.
Remove
the
axle
shafts
as
detailed
in
Section H.1.
Mark
the
propeller
shaft
and
pinion shaft
driving
■anges
so
that
they
may
be
replaced
in the
same
relative
positions;
unscrew
the
self-locking
nuts
and
disconnect
the
joint.
Unscrew
the
10
nuts
securing
the
bevel
pinion
and
gear
carrier
to
the
axle
casing;
withdraw
the,gear
carrier
complete
with
the
pinion shaft
and
differential
assembly.
Make
sure
that
the
differential
bearing
housing
caps‘are
marked
so
that
they
can
be
replaced
in their
original
positions, then
remove
the
four
nuts
and
spring
washers.
Withdraw
the
bearing
caps
and
differential
assembly.
Tap
out
the
dowel
pin
locating
the
differential
pinion
shaft.
The
diameter
of
the
pin
is
T35
in.
(4.8
mm.)
and
it
must
be
tapped
out
from
the
crown
wheel
side
as
the
hole
into
which
it
■ts
has
a
slightly
smaller
diameter
at
the
crown
wheel
end
to
prevent
the
pin
from
passing right
through.
It
may
be
necessary
to
clean
out
the
metal
peened
over
the
entry
hole
with
a
raisin.
(4.8
mm.)
drill
in
order
to
facilitate
removal
of the
dowel
pin. Drive
out
the
differential
pinion
shaft.
The
pinions
and thrust
washers
can
then
be
removed
from
the
cage.
Section
H.5
REPLACING
THE
DIFFERENTIAL
PINIONS
Examine
the
pinions
and thrust
washers
and
renew
as
required.
Replace
the
pinions, thrust
washers,
and
pinion
shaft
in
the
differential
cage
and
insert
the
dowel
pin. Peen
over
the
entry
hole.
H.5