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162
OPERATION
No.
ID 3 3 0 - 3 : Overhauling
the gearbox
e)
f)
?d
Hold
the fixture
firmly
by hand.
Set the dial
gauge
at "0"
and note
the
position
of the needles
. . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . .
To fit the fixture
on the gearbox
(see
Pl. 51,
fig. 1).
Tighten
the adjusting
screw
(C) in order
to move
the pressure
plate
(A) forward.
Do not alter
the
setting
of the
dial
gauge.
Offer
up the
fixture
on the box.
Insert
a paper
joint.
Locate
the pin
in the splines
of the planet
wheel.
Fit
the
fixture.
Tighten
the adjusting
screw(C)
to 72 ft.lbs
(10 m.kg)
and then
unscrew
it l/3
of a turn.
Tighten
the locking
screw
(D).
Pull
on the dial
gauge
spindle
in order
to put the needles
in the position
taken
in paragraph
d .
Release
the
spindle
of the dial
gauge
slowly
and count
the turns
and fractions
of turns.
For
example
a distance
8.2
mm.
To measure
the clearance
between
the teeth
(see
Pl. 50).
Fit
the dial
gauge
support
on the box
(see
fig. 2).
Fit
the extension
2439-T
on the dial
gauge.
Then
fix the dial
gauge
on to the
support
2039-T,
the point
of the extension
resting
perpendicular
to the flank
of the tooth
of the
crown
wheel,
as near
as possible
to the
outside
diameter,
with
the dial
gauge
reading
several
millimetres.
Take
up the
clearance
between
the teeth
by moving
the differential
housing
by the right
hand
brake
disc.
Check
this
clearance
on four
teeth
spaced
90°
approximately.
Take
the average
of these
four
readings.
For
example:
a clearance
of 0.62
mm,
the
clearance
between
the teeth
should
be between
0.19
and
0.24
mm,
it is necessary
to reduce
it by 0.38
mm.
In order
to reduce
the
clearance
between
the teeth
by 0.1
mm,
it is
necessary
to increase
the thickness
of the washers
by 0.2
mm.
In the preceding
example,
in order
to reduce
the
clearance
by 0.38
mm,
increase
the thickness
of the washers
(4 and
5)
( see P1.45)
fitted
between
the right
hand
housing
and
the outer
race
of the bearing
by:
0.2
x 0.38
0.1
=
0.76
mm
The
thickness
of the washers
needed
will
be 6.5
t 0.76
= 7.26
mm.
.I
In order
to obtain
the bearing
clearance,
the total
thickness
of the washers
and distance
pieces
determined
in
paragraph
,e
should
be 8.2
mm.
The thickness
of the shims
fitted
on the left
side:
8.2
- 0.76
= 7.44
mm.
Select
from
the washers
and distance
pieces
sold
by our
Spare
Parts
Department
in order
to obtain:
On right
side:
7.26
mm
an adjusting
washer
(4) of 3.15
mm
and
a distance
piece
(5) of 4.10
mm.
On left
side:
7.44
mm
an adjusting
washer
(4) of 3.35
mm
and
a distance
piece
(5) of 4.10
mm.
Remove
the dial
gauge.
Remove
the adjusting
fixture
and right
hand
housing
. . . . . . . . . . . . . . . . . . . . . . . . . . .*...........................
ID l!
TOOLS
Support
1766-T
Dial
gauge
2437-T
Extension
2438-T
Support
for dial
gauge
2039-T
Extension
2439 -T
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