MG MGA Twin Cam Workshop Manual page 109

THE REAR AXLE
H
Section H.2
REMOVh~G
AND REPLACING A HUB
Remove the hub e><tension and al<le shaft as detaikd
in
Section H.
I. Remove the wheel brake unit by the
method described in Section M.7.
Knock back the tab of the hub nut locking washer,
unscrew the nut using spanner 18G 152, and pull off the
washer. The left-hand hub bearing nut has a left-band
thread and is turned in a clockwise direction to unscrew.
The hub and brake disc assembly can then be with-
drawn, using rear hub remover 18G304 together Mth .
adaptors 18G304B :tnd thrust pad 18G304J.
The
bearing
and
oil
seal will be
withdrawn with
the
hub.
The bearing is not adjustable and is replaced in one
straightforward operation. Replace the bub and drift it
into position with replacer 18Gl34 and adaptor l8Gl34P.
The remainder is a reversal of the above sequence of
operations.
Section H.3
RE:IIEWJNG THE BEVEL PINION OIL SEAL
Mark the propeller shaft and the pinion driving
llanges
SQ
that
they
l!!liY
l;>e f9llaced in the same relative
positions. Disconnect the propeller shaft.
Unscrew the nut in the centre of the driving flange
using bevel pinion flange wrench 18G34A to prevent the
llange from turning. Remove the nut and washer and
withdraw the flange 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 flange end cover, :taking care not
to
damage the edge of the oil seal.
T~ghten
the nut with
a torque
wrc~b (!!Crvi~
tool 18G372) to a rea:iling of
140 lb. ft. (19-4 kg.
m.).
Reconnect the propeller shaft, taking care to fit the
two flanges
w;tb
the locating marks in alignment.
Section H.4
REMOVING THE DIFFERENTIAL PINIONS
Drain the oil from the axle casing.
Remove the al<le shafts as detailed in Section
H . I.
Mark the propeller shaft and pinion shaft driving
Hanges 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 ule casing; withdraw the gear
~IGA
(Twin Cam). Issue 3. 27765
Fig. H.3
Using service too/18G47C and adaptors 18G47T
to remore the differential bearings
carrier complete with the pinion shaft and differential
assembly.
Tap out the dowel pin locating the differential pinion
shaft. The
diameter of the pin
is
fa-
in. (4·8 mm.) and
it must be tapped out from the crown wheel side as the
hole into which it
fits
has a
s.lightly 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 bole with a
fi
in.
(4·8
mm.) drill
in order to faci.litate 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 .S
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.
Reassembly is now a reversal of the instructions given
in Section H.4. Refill the rude with fresh oil to Ref. B
(page P.2).
If
it proves necessary to fit any new parts other than
those detailed In
Sections
H.l., H .3, or
H.S the axle
assembly must be set up as in Sectioa H. 7.
Section H .6
DISMANTLING THE CROWN WH EEL
AND PINION
Remove the differential assembly as detailed in
Section H.4.
Make sure that the differential bearing housing caps
H.S