DS 19 OPERATION No. DS 330-3 : Overhauling a gearbox. Op. DS 330-3 211
TOOLS
f) To measure the clearance between the teeth.
Fit the dial gauge support on the box (see Pl. 59, 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 a tooth
on 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 at 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) fitted between the right-hand housing and
the outer race of the bearing by :
The thickness of the washers needed will be : 6.5 + 0.76 = 7.26 mm.
In order to obtain the bearing clearance, the total thickness of the washers and distance pieces determined
in paragraph “e” should be 8.20 mm.
The thickness of the shims fitted on the left side should be :
8.20 – 0.76 = 7.44 mm.
Select from the washers and distance pieces sold by our Spare Parts Department in order to obtain :
On the right side : 7.26 mm, an adjusting washer (4) of 3.15 mm and a distance piece (5) of 4.10 mm.
On the 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Support for dial gauge
2039-T
Extension 2439-T
43 To prepare the left-hand bearing housing assembly (see paragraph 27).
44 To prepare the shaft and bearing assembly (see Pl. 54, fig. 1).
Put the adjusting washers (4) and the distance piece (5) previously prepared, in their respective positions. Fit a
paper joint on the housing.
Put the housing in position, the oil drain channel towards the bottom. (The longer housing fitted on the left
side). Make sure that the distance piece (92) is in position. Put the large diameter washer (93) between the
bracket and the housing and the washer (94), under the head of the screw.
Tighten the screws fixing the housing. Check the clearance between the teeth as indicated in the preceding
paragraph. Screw up, without tightening the screws (1) fixing the brackets. Fit on the bracket arms (2), the
support fixture 1799-T (see Pl. 51), tighten the screws fixing the fixture. Tighten the screws (1) fixing the
brackets on the box. Remove the support fixture. The object of this operation is to line up the brackets (2) Support fixture 1799-T
0.2
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