Owners Manual

REAR
AXLE
K/7
Fig.
9.
Replacing pinion front outer race.
The unit is now fully dismantled and all parts
should be checked for scoring
and
signs
of
wear.
Wash all parts in paraffin, and ensure that they are
clean when reassembled.
Differential Wheels
and
Pinions-
To Replace
Replace the differential wheels
in
the case and place
the pinions, together with their thrust washers, in posi-
tion. Push home the pinion shaft and secure with the shaft
retaining peg. The peg can only be fitted from the right-
hand
side
of
the case and, when in position, the rim
of
the hole must be sufficiently peened over to prevent the
peg vibrating loose.
Crown
Wheel
and
Bearings-
To Replace
Bolt the crown wheel
to
the differential case but do
not
turn over the lockwashers.
If
new races are necessary
take particular care to ensure they are fitted correctly.
The word
"thrust" which is stamped on one side
of
the
race must be on the outside.
At this stage the crown wheel should be checked for
alignment. The crown wheel, differential case and
bearings complete should be placed on a pair
of
vee
blocks for this test and a dial indicator used. The crown
wheel should be slowly rotated and measurements taken
on the face
of
the wheel. The crown wheel must not be
more than .
002-in. (.
0508
mm.) out
of
true. Any
greater irregularity must be corrected. First detach the
crown wheel from the differential casing and examine for
any slight particles
of
grit on the flange. When the
parts are thoroughly cleaned
it
is
rare to find that the
crown wheel does not run true. The pinion mesh
will
be automatically correct for depth.
Finally turn over the lockwashers for the crown
wheel securing bolts.
Carrier-To
Replace
With the bevel pinion in place in the gear carrier
and the pinion bearings correctly adjusted for pre-load
as
described in an earlier paragraph, the crown wheel
and differential unit can be refitted to the carrier.
Replace the differential unit complete into the
carrier and secure the end caps with the four nuts and
spring washers.
On models fitted with
an
aluminium
carrier, bolts are employed instead
of
studs. (See inset,
Fig.
1.) The differential unit bearings should be a tight
fit into their respective housings in the carrier, since in
manufacture the machining tolerances
of
the bearing
housings are adjusted to give a
.002-in. (.0508 mm.)
pre-load on the bearings.
The backlash between the mesh
of
the pinion and
crown wheel teeth should be between .
005-. 008-in.
(. 127-.2032 mm.), and the correct figure for each set
of
gears will be found etched on the back
of
the crown
wheel. Measure the backlash when the gears are
secured in the carrier by using a dial gauge to register
against the crown wheel teeth while the pinion
is
firmly
held.
If
the backlash
is
found to be too great or too
small, adjustment may be effected
by
moving the shim
or shims, positioned between the differential case and
the inner race
of
the differential bearings, from one side
of
the crown wheel to the other
as
required.
The differential carrier can now be refitted into the
axle case and secured
by
replacing the nuts. Use a
new paper joint washer.
Fig. 10. The backlash
of
.005 to .008-in. between
the bevel pinion and the crown wheel may
be
ad-
justed by shims placed between the differential casing
(A) and the crown wheel bearings.