-------------~--THE
BEAR
AXLE
H
The
actual pinion assembly is carried
out
by
thread-
ing'
the
special pinion
washer
[ust
selected on
the
pinion shaft, bevelled side agalnst
the
pinion, and
pressing on
the
rear
roller
bearing Inner race with its
projecting side against
the
washer, This sub-assembly
is
then
inserted into
the
casing
through
the
axle cover
opening and located In position in
the
pinion housing
of
the
axle casing.
The
dtstance-plece and forward roller bearing Inner
race
are
next
passed on to
the
pinion shaft, with
the
projecting side of
the
inner
race facing forward. These
components
are
followed by
the
pinion flange with its
retaining
washer
and nut. Tighten up
the
nut
firmly.
Rotate
the
pinion, using special
tool,
Part No.
68839,
to
ascertain
that
the
correct
degree
of pre-load Is
Fir.
H.ll.
The pinion and piniOfl spacing
washer.
Note
that the
bevelled
side of the
_her
bore
should be
apinst
the pinion.
present.
The
pinion should
present
the
same resis-
tance
to
rotatIon aswas
evident
when
using
the
special
dummy spindle, namely II
to
13
In./lb. (,126
to
·149
m./kg.).
If
the
pre-load Is
correct.
undo
the
nut
and remove
the
washer
and
flange;
fit
the
oil seal (sharp
edge
of
the
bore
towards
bearing), replace
the
pinion flange,
retaining
washer
and nut.
If
the
pre-load is
not
correct
the
distance-piece and
bearing
assembly will have
to
be replaced by
the
selection process until
the
correct
pre-load isobtained.
Finally
tighten
up
the
nut
and fit
the
split pin.
Section
B.l2
TO FIT A
NEW
AXLE CASING
When
a
new
axle case is being fitted it is necessary
to refit
the
pinion as detailed In Section
H.".
and
select a new distance collar
for
the
differential bearing
in
the
manner
here
Indicated.
Compensation for variations in
the
depth
of
the
differential bearing bores Is made by taking
note
of
the
markings on
the
old and
new
axle casings. For
example
:-
If
the
old casing is +·002 in. and
the
new one
,·004
in..
the
positive difference ·001 in. is added
to
the
existing differential bearing distance collar.
That
is
to
say, If
the
old distance collar is marked ·505 in.•
then
the
required
new
distance collar is ·507 in.
Similarly. if
the
old casing is +·005 in. and
the
new
one
+·001 ln.,
the
resulting difference is negative.
-·004
ln., and must be
subtracted
from
the
bearing
distance collar,
t.e, if
the
old distance colIar
is'
509 fn.•
the
required
new distance collar is ·505 in.
The distance collars are manufactured in steps of
·001
in. and measurements should
therefore
be made
to
the
nearest
thousandth of an inch.
Section
0.13
TO FIT A
NEW
AXLE HOUSING
COVER
When
a
new
axle cover is belng fitted it Is
not
necessary
to
make any
adjustment
to
the
pinion.
Compensation must, however, be made
for
varia-
tions
in
the
depth of
the
differential bearing housing
in
the
same manner as
that
outlined for
the
axle
casing in Section
H:J2,
and
the
same calculations for
the
selection of
the
required
new distance collar
for
the
differential bearings
are
Involved.
Seetion
D.14
TO
REPLACE
A CROWN WHEEL
AND
PINION HAVING MARKINGS
DIFFERENT
FROM
THE ORIGINAL
Note.-
The
crown
wheels
and
pinions
are
manufactured
in
matched
pairs
and
are
not
replaceable
individually
but
only
in
pairs.
The
necessity
for
replacing
either
a
pinion
Or
crown
wheel
therefore
necessitates
the
fitting
of
a
new
pair
of
components
and
the
operations
of
fitting
a
new
pinion
and
a
new
crown
wheel
are
involved.
The
crown wheels
are
marked on
their
back faces
wit h one of
the
followi ng markl
"gs:
+2.
+ I, Ze ro
(or no marking),
-lor
-2.
Read off
the
markings from
the
back face of
the
old
crown wheel and
note
the
difference between this
and
the
marking on
the
new
crown wheel.
H.13
Wishvilles Classic
Automobile Library
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