-----------------TBE
REAIl
AXLE
H
The
crown
wheel and pInion
are
lapped In pairs.
It is essential,
therefore,
that
crown wheels
and pinions
be
stored
and used in pairs as origi-
nally
supplied,
otherwise
satisfactory
results
cannot
be obtained.
Ifthe
Inner
races
of
the
roller
bearings
are
loose on
the
pinion.
check
with
a
new
set
of
bearings, and If
these
are
also loose on
the
pinion shaft it is an indlea-
tion
that
the
shaft has
worn;
a
new
crown
wheel
and
pinion should be fitted.
Fractures
ill
the
teeth.
hollows
or
any roughness
on
the
surface of
the
teeth
will
render
both
crown
wheels
and pinions unserviceable.
The
axle casing
or
axle
cover
(or
both) should be
renewed
if
new
replacement
bearings
are
not
a light
drive
fit In
the
bores machined In
their
housings.
Fig. H.ID.
The marking of
the
differential cage
to
indicate its
assembly dimensions Is clearly shown In this illustration,
which bears
a
"C
" dimension of·OO8 and a " D "
dimension of .()().i.
Any looseness of
the
bearings should be
overcome
by
renewing
the
bearing.
the
axle
cover
or
axle
caslng.
The
cage should be
renewed
if
there
is excessive
wear
in
the
bores
in which
the
differential
gears
revolve.
The
oil seals should be
renewed
if
they
are
not
a
press fit in
the
pinion housing
or
wheel bearing
housing.
or
If
their
central
portion
is loose in
the
outer
metal casing,
or
if
the
spring
is
fractured
or
broken.
The
differential gears, pinions and pins should be
renewed
If
there
is any
doubt
about
their
condition.
M.G. Midget.
luue
3 (H & E)
95781-9{55
although
more
latitude
In
wear
is permissible in
these
parts
wIthout
detrimental
effects
than
is
the
case
with
the
crown
wheel
and pinion.
Seetion
0.9
TO
REPLACE
A DIFFERENTIAL CAGE
Selecting
an axle casing
spacer
All differential cages are
stamped
with
two
letters-
..
C " and " D
"-togethe
r with a figureo The prefix
..
C"
indicates
the
dimens ion
over
the
differential
bearings and
the
dimensional range is
from
0 in.
to
52
. 0
c
Fig.
H.II.
This diagram
·1
ndicates
the
signiflcance of
the
"A."
..
S,"
" C .. and .. 0 " dimensions.
·012
in
...
D"
indicates
the
dimension from
the
crown
wheel
back face
to
the
outside
face of
the
right·hand
bearing
outer
race and
the
range is
from
oin.
to
+,006
In:
Differential cages can be
interchanged
by applying
the
following
procedure
:-
Balance
the
..
D"
dimensions of
the
two
cages
and from
the
resu It select differential bearing spacers
which will
produce
the
same final location of
the
crown
wheel
on assembly.
Exampie
(I)
If
the
.. D " dImenslon
of
the
old cage
was ·005 in. and
the"
D " dimension
on
the
new
cage is ·002 ln., giving a
difference
of
+-003
in.,
then
this
difference
must
be
added
to
the
old
spacer thickness.
That
is
to
say. If
the
old spacer is
marked ,503 in.
the
new
spacer
must
be ·506 In. thick.
H.9
Wishvilles Classic
Automobile Library
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