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H
THE REAR AXLE
(c)
Ir
the
doek reading
is
plus and numerically
greate.
r than
the pinion
marking
inerease the
washer
thickness
by
the difference.
Example:
Clock
reading
Pinio
n marking
Variation from
nomi
nal
-H>08
in.
-
·003
in.
+·005
in.
Increase the washer thickness
by
this amount.
Table of washt!r and
shim thicknesses
Pinion head
washer
thickness ·112 to
·126
in.
in
steps
of
·002 in.
Pinion
bearing
preload
shims
..
.
.
.
.
·004
to
·0
12
in
.
in
steps
of
·002
in.,
plus
·020 in.
and
·030
in.
Crown
wheel
bearing shims
·002
in.,
·003
in.,
.()()4
in., ·006in.and·OI0in.
Pinion bearing
preload
..
10
to
12
lb.
in.
with-
o
ut
oil
seal; lJ
to
I
5
lb.
in. with
oil seal
Crown
wheel
bearing pinch
-()()2
in. each side
The only
cases where
no
a
lterations
are
required
to
the washer thickness are when
the
clock reading
is
plus
and
nume:rieaDy equal
to the
unbracketed
pinion marking. or
when
the
clock reading is
zero
and
there
is
no
unbracketed marking
on
the
pinion head
.
{9)
Allo~ance
sho
uld
then
finally
be
made for
the
mounting
distance
marked
on
the
pinion head
in
a
rectangula
r
bracket as
follows.
I
f
the
mark
ing
is a
plus figure,
reduce
the
washer
thickness
by
an
equal
amount.
If
the
marking is a
minus
figure,
increase
the
washer thickness by
an
equal
amount.
A
tolerance
of ·001
io.
is allowed
in
the
thickness
of
the washer finally
fitted.
Fit
the
appropriate
washer
to
the
pinion head.
2.
ADJUSTING PINION BEARING PRELOAD
Assemble
the
p
inion,
pinion
bearings,
bearing
spacer,
and
shims
to
the
gear
carrier;
fit
the oil
seal
and driving
flange.
Shims
to
a
thickness of
·008 to
·Oil
in. (·2
to
·28
mm.)
should
be used as a
starting-point
for adjust-
ment
of
the
bearing preload.
H .8
Tighten th
e dri
ving
flange nut gradually
with
a
torque
wrench
to 140
lb.
ft.
(19·4
kg. m.)
and
check the
preload
o
n
t he bearings
during
tightening
to ensure that
it
does not
exceed
13
to
15
lb.
in. {·150 to
·173
kg.
m.),
i.e.
3
lb.
in.
{·034
kg.
m.)
greater
than
the recommended
figure, since the
oil
seal
is
now
fitted. If
the preload
is
too
great
more shims
must be added.
If
the
preload
is too
small when
the
nut is tightened
correctly the shim
thick-
ness
m
ust
be
reduced.
3.
SETTING
THE
CROWN
WHEE
L
POSITIOK
{I)
Before fitting
the
cro
wn wheel
and
differential
assembly
to
the gear carrier
it is
necessary to
calculate
the shim
thickness
required behiod
each
bearing to give
the
required pinch.
To
facilitate
t
he
calculation machining
variations are
indicated
by
stamped
numbers
on
the
carrier
adjacent to the
bearing bores.
The
dimensions
to
be
considered
are
shown in
Fig. H.8,
(A)
being the distance from
the
centre-line
to
the
bearing register
of
the
carrier
on the left-hand side and
(8)
the
distance
from
the
centre-line to the bearing
register of t
he
carrier
on the right-hand side. The
(C)
dimension
is
from
the
bearin
g register on one
s
ide
of the
cage to the
register
on
the
other side, while
the
(o)
dimension
is
from
the
rear
face
of
the crown
wheel
to
the
bearing
register
on
the opposite
side.
Any
variation
fro
m
nominal
on
the
(A
) dimension
will be found
C.L.
I
Fig.
H .8
The dimensions referred
to
in
the i11structions for
differential
setting
MGA
(Twin
Cam).
Issue
2.
23026
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