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THE REAR AXLE
H
stamped
on the carrier
adjacent
to the bearing bore,
and
similarly
with the (B) dimension. The varia·
tioos
from nominal
on the (c)
and (o) dimensions
are
stamped
on the
machined face of
the differential
ca.
g e.
It is possible to calculate the shim thickness
required
on
the
Jd't-hand side
by
the
use of the
following formula:
A
+o-c+-()()7
in.
Substituting the actual variations shown, this
formula gives
tbe
shim thickness required
to
com·
pensate for the
variations
in
machining
plus
the
extra
·002
in.
(·05
mrn.)
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 1801918.
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.9.)
This is the
Fig.
H.9
To
m~asure
\'QriDtiQns
in
bearing thlcknas first zero
the
gauge on the portion of
the
gauge block marked
'B'
for
the
'
MGA'
axles
MOA
(Twin Cam).
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2. 2.3026
Fig. H .IO
t.IAJ•
004i·
·
I
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I•Q,fN"T1HC OISTNC.l
MAXJ.Oo.iot
~lS
4
a
CroK'T!
wheel a11d pinion markings
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 ngainst
the balls, take
a
reading (Fig.
H.
II).
Normally the
bearing
will be standard
to
-
·003 in.,
though
in
some
cases
the
tolerance
may
be
from
standard
to
-
-Q05
in.
A
negative variation shown by
this
test
indicates
the additional thickness of
shimming
to
be added to that
side
of tbe differential.
The
formula for
the
right~and
side
is:
a-
o
+
-oo6
in.
aod here again final aUowance must
be
Jlllldc
for
variation in bearing
thickness.
(2)
When
a
framed
number
is marked
on
the
back
of
the crown wheel,
e.g.
1
+21.
it
must
be taken
into
account
before assembling
the
shims and bearings
to the dill'erential 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 -()()2 in.
(·05
mm.)
must be uansferred
from
the
left-hand
side
(the crown wheel
stde)
to
the right-hand side.
If
the marking
is -2,
then
shims
to the
value of -002
in.
(·05
mm.)
must be
moved from theright·hand side to the
left-hand side.
H.9
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