MG MGB - Removing and Refitting the Axle; Crown Wheel and Pinion Markings; Measuring the Crown Wheel Backlash

[I
THE REAR AXLE
AND
SUSPENSION
A
/7
I/
B
/
33+
1
_
E
IISII
1—:
Fig. H.l3
Crown wheel and
pinion markings
.
Pinion head thickness.
.
Crown wheel
marking.
.
Pinion
marking.
.
Pinion
mounting distance.
.
Crown
wheel
mounting distance.
NUOW>
Tighten
the bolts
to
the
correct torque
wrench reading
and knock
over
the
locking
tabs.
3.
Fit- the differential
to
the
gear
carrier.
Replace
the
bearing
caps
and tighten the
nuts to
a
torque
wrench
reading
of
65 1b.
ft.
(8.99
kg.
m.).
Bolt the
Service
tool
surface
plate
to
the
gear
carrier
■ange
and
mount
the
clock
gauge on
the
magnet
bracket
in
such
a way
that
an
accurate
backlash ■gure
may
be
obtained.
(See
Fig.
H.14.)
The
correct
■gure for the
backlash
to
be
used with
any
particular
crown
wheel
and
pinion
is
etched
on
the
rear
face
of the
crown
wheel
concerned
and
must
be adhered
to
strictly.
A
movement
of
.002
in.
(.05 mm.)
shim
thickness
from
one
side
of the
differential
to
the
other will
produce
a
variation in
backlash
of
approximately
.002
in.
(.05 mm.).
Thus
it
should
be possible
to
set
up
the
differential,
even
though the
backlash
is incorrect,
by
removing
the
hearings
on one
occasion
only.
Great
care
must
be taken
to
ensure
absolute
cleanliness during the
above
operations,
as any
discrepancies resulting from
dirty
assembly
would
affect the
setting position
of the
crown
wheel
or
pinion.
H.10
Section
H.8
REMOVING
AND REFITTING
THE
AXLE
Raise
the
rear
of
the
car.
Mark the
propeller shaft coupling
■anges
so
that they
may
be
replaced
in
the
original relative
positions. Remove the
four
bolts
and
self-locking
nuts
and release
the
rear
end of
the
propeller shaft from
the axle.
Remove
the
nuts
and
spring
and ■at
washers
securing
each
end of
each check
strap
to
the anchor
pins
and
remove
the
check
straps.
Remove
the
split
pin
and
clevis
pin
securing
the
brake.
cables
to
each brake
operating
lever.
Remove
the
small
nut
and Phillips
recessed-head
screw
securing
the
hand
brake
cable clip
to
the
axle
casing.
Remove
the
self-locking
nut
and large ■at
washer
securing
the
brake
balance
lever
to
the
pivot
on
the
axle
casing.
Remove the
nut
and
spring
washer
securing
the
lower
end
of each
damper
link
to
the
rear
spring
clamp
plate.
Unscrew
the
brake ■uid
supply
pipe
union and
release
the
■exible
pipe
from
the
battery
box
support
bracket.
Release
the exhaust
pipe
from
the exhaust
manifold
and
the
two
supporting
brackets
and
lower the
exhaust
pipe
assembly.
Remove
the
nut
and
spring
washer
from the
spring
front
anchor
pin.
Support the axle
casing
and
remove
the
rear
shackle
plates,
brackets,
and rubbers.
Lower the axle
support
until
the axle
and
spring
assembly
rests
on
the
road wheels. Withdraw
the
front
anchor
pins
and roll the
assembly from
beneath
the
car.
The
axle
is
now
free
to
be withdrawn
on
the
stand
rearwards fromthe
car.
Replacement
is
the
reverse
of the
above
sequence
of
operations.
A9I4BW
Fig.
H.14
Measuring
the
crown
wheelbacklash
MGB.
Issue4, 60230