DS 19 OPERATION No. DS 330-3 : Overhauling a gearbox. Op. DS 330-3 204
TOOLS
Our Spare Parts Department only sell parts for the second type assembly. If one of the two pinions (3rd speed
pinion on the mainshaft or double pinion of the intermediate train) is to be renewed, it is necessary to renew the
other pinion of this assembly.
One can replace a 4th speed pinion, 1st type, by a 2nd type pinion, without other modification.
a) Fit on the shaft, the 3rd speed sliding pinion (43), fitted with its needle bearing cages. Select from the half
segments (42) those with a slight tightness or a clearance between 0.02 and 0.06 mm in the groove of the shaft.
Fit the half segment retaining washer (41).
b) Fit the 2nd speed sliding pinion (40) fitted with its needle bearing cages, the synchro bush, the synchro hub
carrying the driving pins.
IMPORTANT REMARK - There are two types of 2nd speed driving pinions.
1st type assembly (cars produced before June 1958) : taper 7˚
2nd type assembly (cars produced since June 1958) : taper 7˚ 30’.
The two types of assemblies should be carefully observed (see Pl. 53A, fig. 2). These parts should not be mixed.
One can indiscriminately fit the parts of the two assemblies shown on Pl. 53 A, fig. 2 or 3.
c) To adjust the movement of the synchro bush
Hold the synchro hub against the 2nd speed loose pinion (shoulder of the shaft) by hand. The bush of the
synchro in contact with the cone of the 2nd speed loose pinion (40), using a set of feelers, measure the
clearance “c” existing between the rear face of the synchro bush and the front face of the reverse speed pinion.
Select from shims sold by our Spare Parts Department, to give a clearance at “c” of between 0.20 and 0.65 mm.
d) Fit the shim, the synchro hub, the pinion (19), the bearing (17). Select a shim (18) which will allow the circlip
(16) to just enter the groove in the shaft or permits a clearance of between 0.02 and 0.06 mm.
e) (Cars produced before October 1957.) To adjust the clearance of the front bearing
Remove the circlip, the shims, the bearing and the pinion (19). Move the synchro in the 2nd speed position. Fit
the front bearing in its cage.
Fit a paper joint. Tighten the cap on the housing in order to compress the joint. Remove the cap.
With the joint in position on the cap, put a straight edge with a dial gauge (straight edge MR-3377, see Pl. 56,
fig. 2 and dial gauge 2437-T) on the joint, the point of the dial gauge in contact with the thrust face of the
bearing. Set the dial gauge at “0” (the straight edge flat on the joint).
Mark the position of the totalising needle. The dial gauge being thus set, put the straight edge on the outer cage
of the bearing, the point of the dial gauge resting on the outer face of the steel housing.
Check the difference with the first measurement. Reduce this difference by 0.05 mm in order to compensate for
the compressing of the joint.
This difference represents the thickness of the shims placed between the cap and the bearing.
Do not mix the shims thus determined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Straight edge MR-3377
Dial gauge 2437-T
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