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H
THE
REAR
AXLE
Fig. H.ll
Chuking
the
Yariation in bearing
thickness
4. ADJUSTING
THE
BACKLASH
(I) Assemble the
bearings (thrust
side
outwards)
and
shims as
ca.
l culated
to
the differential
cage.
(2)
Bolt the
crown
wheel to the differential cage, but
do not
knock over
the locking tabs.
Tighten
the
nuts
10
a torque
wrench
reading
of
60
lb.
n.
(8·
3 kg. m.).
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. Detach
the
crown wheel and examine
the joint
faces
on
the flange of the differential cage
and crown wheel for any particles
of
dirt.
When
the parts
are
thoroughly cleaned it is
unlikely that the
crov.'Tl
wbttl will
not
run
ITUC.
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 lb.
ft.
(8·99
kg.
m.).
Bolt the
special tool
surface
plate
to
the
gear
carrier
!lange
and
mount the
clock
gauge on the magnet bracket
in such a way that
an
accurate bacldash
figure
may
be
obtained. (Sec Fig.
H
.l2).
The minimum
backlash allowed in
any
circumstances is
·005
in.
H.IO
(·127 mm.) and the maximum
is
·007 in.
(·178mm.).
The correct figure for the backlash to be
used
with
any
particular
crown
wheel and pinhn
is
etched
on the
rear face
of
the
crown
wheel con-
cerned
and
must
be
adhered
to
strictly.
A movement
of
.()()2
in.
(
-()5
mm.) shim
thickness
from
one
side of the
differential to the other will
produce a variation
in
backlash
of
approximately
-()()2
in. (-<l5 mm.). Thus it should be possible to
set
up the differential,
even
though
the
backlash is
incorrect,
by removing the bearings
on
one occasion
only.
Great care must be taken to ensure absolute
cleanliness during the above operations, as
any
discrepancies resulting from dirty
ossembly
would
affect
the setting position
of
the crown wheel
or
pinion.
Fig. H.12
Measuring
the
crown
wheel backla.sh
MOA
(Twin
Cam).
laue 2.
23026
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