MG MGB User Manual

THE
REAR
AXLE AND
SUSPENSION
H
It
is
possible
to
calculate the shim
thickness
required
on
the
left-hand
side
by
the
use
of the
following
formula:
A+D—C+.007in.
Substituting
the
actual
variations
shown,
this
formula
gives
the
shim
thickness required
to
compensate
for
the
variations in
machining plus
the
extra
.002
in.
(.05
mm.)
to
give
the
necessary
bearing
pinch. In addition,
allowance
must
be
made for
variations
in
bearing
thickness
in
the following
manner.
Rest
the bearing,
with
the
inner
race over
the
recess
and the
outer
ring
thrust
face
downwards,
on
the
small
surface plate
of tool 18G
191
A.
Drop
the
magnet onto
the
surface plate and
set
the
clock
gauge
to
zero
on
the small
gauge
block
on
the
step
marked
‘B’.
(See
Fig.
H.11). This
is
the thickness
of the
standard bearing. Swing
over
the indicator until
it
rests
on
the plain
surface
of the
inner
race
and,
holding
the
inner
race
down
against
the balls,
take
a
reading
(Fig.
H.12). Normally
the
bearing
will be
standard
to
—.003 in.,
though
in
some
cases
the
tolerance
may
be
from
standard
to
—.005
in.
A
\\\\\\\\\\\\\\\\\i
_/
Ki
Mk
iii
A5592W
negative
variation
shown by
this
test
indicates
the
,
Fig-
H-12
.
dd.
.
1
thi k
f hi
.
t
b dd
d
t
th
With
the
gauge
set
to
zero,
place the bearmg
on
the surface
a
mona
C
nessi 0 S
mmmg
0 e a
e O
at
plate with the
outer
ring
thrust face down, and
take
a
reading
side
of the
differential.
while the
indicator foot
contacts
the inner ring
The
formula
for the
right-hand
side
is:
B
—
D
+
.006
in.
and
here
again
final allowance
must
be
made
for
variation
in
bearing
thickness.
2.
When
a
framed number
is
marked
on
the back
of
the
crown
wheel,
e.g.
—2, it
must
be taken
into
account
before assembling
the shims and bearings
to
.the
differential
cage.
This mark
assists in
relating
the
crown
wheel
with
the
pinion.
’
If, for
example, the mark
is
+2,
then
shims
to
the
value
of
.002 in.
(.05 mm.)
must
be
transferred from
the left-hand side
(the
crown
wheel
side)
to
the
right-hand side. If the marking
is
42,
then shims
to
the value
of
.002
in.
(.05 mm.)
must
be moved
from
the
right-hand side
to
the left-hand side,
4.
ADJUSTING THE
BACKLASH
1.
Assemble the bearings
and shims
as
calculated
to
the
differential
cage.
2.
Bolt the
crown
wheel
to
the
differential
case,
but do
not
knock
over
the locking tabs.
Tighten the
nuts to
a
torque
wrench reading
of
60 lb.
ft.
(8.3
kg.
m.).
Fit the shims and
differential bearings
with the thrust
faces outwards.
Mount
the
assembly
on
two
‘V’
blocks and
check the
amount
of
run—out
of the
crown
wheel,
as
it is
rotated,
by
means
of
a
suitably mounted dial
indicator.
_
The
maximum
permissible
run-out
is
.002 in.
(.05
\
mm.)
and
any
greater
irregularity
must
be
corrected.
A559|W
Detach the
crown
wheel
and examine
the
joint
faces
on
the flange
of the differential
case
and
crown
wheel
for
any
particles
of
dirt.
Fig. H.11
. .
.
To
measure
variations in
bearing
thickness
first
zero
the
When the
Parts
are
thoroughly
Cleaned
It
Is
unhkely
gaugeon
the appropriate portion
of the
gauge
block
that
the
crown
wheel will
not
run
true.
MGB.
Issue4.
60230
H.9

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English