MG MGB User Manual

Ha
THE
REAR
AXLE
AND
REAR
SUSPENSION
collapsible
spacer
and oil
seal. Fit the
inner
race
of
the
front
bearing.
NOTE—The standard
pinion head
spacer
(0.208
in.
(5.3
mm.))
is incorporated
in the dummy
pinion.
Refit the
universal
joint driving ■ange
and tighten
the
nut
gradually
until
a
bearing
preload
■gure of
10
to
20 lb.
in.
(.11
to
.2
kg.
m.)
is
obtained.
Clean the
dummy
pinion
head
and
remove
the
keep disc
from the
base of the
magnet.
Position
the dial
indicator
foot
on
the
pinion
head
and
adjust the
dial indicator
to
zero
(see
Fig. Ha.6).
Move the
indicator
arm
until the foot of
the
gauge
rests
on
the
centre
of
the
differential
bore
at
one
side and tighten
the knurled
locking
screws.
Obtain the
maximum
depth
reading and
note
any
variation
from the
zero
setting.
Repeat this check
on
the
opposite
bearing bore.
Add the
two
variations
together and
divide by
two to
obtain
a mean
reading.
The reading shown
on
the
clock will be
the
amount
of
correction
necessary
to
the
spacer
which
is 0.208
in.
(5.3
mm.)
thick.
(a)
If the
clock reading
is
negative
(~)
reduce
the
spacer
thickness
by this
amount.
(b)
If
the clock
reading
is
positive
(+)
increase
the
spacer
thickness
by
this
amount.
Allowance
must
finally
be
made for
the
mounting
distance
marked
on
the
pinion
head
in
a
rectangular
bracket.
Proceed
as
follows:
If the
marking
is
positive (+)
reduce the
washer thickness
by
an
equal
amount.
If the
marking
is negative
(—)
increase
the
washer thickness
by
an
equal
amount.
A tolerance
of
.001
in.
is
allowed
in
the thickness
of
the
washer finally
fitted.
Remove the
dummy
pinion.
Available
washers
for
pinion
position
Eight
washers
are
available
in .002
in.
(.051
mm.)
steps
from
0.208
in.
(5.3
mm.)
to
.222
in.
(5.64
mm.).
2.
PINION
BEARING PRELOAD
A
washer
of the
thickness
indicated
by
the
use
of the tools
and
by the calculations
should
be ■tted
under the
pinion
head. Fit
the
pinion
inner
bearing
race.
Using
18G
47
C,
and
adaptor 18G
47 AS. Insert the
pinion into
the
case
and
fit
the
collapsible
spacer
with the
small diameter
towards
the shoulder
of
the
pinion
head.
‘~mmlmlmmu
lICMIUUIIIW
.m
‘
VIN‘M‘W‘W
-‘
'
@L’é/
Fig.
Ha.5
Checking
the
bevel
pinion bearing
preload
(18G
207)
A665l
.
Ha.6
Support the
head
of the
pinion
and
press
the
outer
bearing
onto
the
pinion;
do
not
compress
the
spacer.
Grease the
periphery
and sealing
lip
of the
seal
and ■t
the
seal
■ush
with
the
axle
casing.
Fit
the
universal
joint ■ange,
washer
and
nut.
Tighten
the
■ange
nut to
140
lb.
ft. (20.7
kg.
m.)
using
18G
592 and ■ange
wrench
18G
34 A,
progressively
increase
the
torque
load
by
10
1b. ft. (1
kg. m.)
until the
spacer
starts
to
collapse.
Rotate
the
pinion
to
settle
the
bearings
and
using 180
207 B check
the
pinion
pre-load.
BEARING
PRELOAD
IS RAPID.
IF THE
TORQUE
OF
24
LB.
IN.
(0.3
KG. M.)
IS EXCEEDED
THE
PINION
MUST
BE
DISMANTLED
AND
A NEW
COLLAPSIBLE
SPACER
FITTED.
In
practice
the
pinion
nut
will
require tightening
A
VERY
SMALL
AMOUNT
BETWEEN
EACH
PINION
TORQUE
CHECK.
When
the
nut
is correctly
tightened
it
should
provide
a
pre-load
of
14
to
18
lb.
in.
(0.10
to
0.16
kg.
m.).
3.
SETTING
THE CROWN
WHEEL
POSITION
Assemble
each
inner
and
outer
bearing
race
to
the
differential
assembly.
Using
crown
wheel
setting tools
(18G
191, 18G
191
F,
and
18G
191
J)
place
the
differential
assembly
onto
the
jig and
load the
crown
wheel
assembly.
Spin the
unit
to
settle the
bearings.
The
standard
measurement
of the
bearing
bores
is 7.243
in.
(183.98
mm.).
Any
excess
machined
from
the
bores
will
be
marked
A and
B
on
the
axle
casing.
The
A and
B tolerances
added
to
the
standard
measurement
will
determine
the
overall
dimension
(see
Example
A).
A5930
A
Fig.
Ha.6
Taking
a
reading
of
the
bearing
bore and
(inset)
the dial
gauge
set at
zero
on
the
dummy
pinion
MGB.
Issue2.
80619

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English