DS 19 OPERATION No. DS 334-0 Checking and adjustments on the change speed control. Op. DS 334-0 228
TOOLS
(Cars produced since March 1957.) (see fig. 3).
29 As indicated in paragraph 28, measure the dimensions “r’” and “s’” in order to obtain the difference of the height:
Select from the adjusting washers sold by our Spare Parts Department, a washer which will bring this
difference to a maximum of 0.3 mm.
TO ADJUST THE PIPE ASSEMBLIES CONTROLLING THE GEARS (in the case of replacement
of the gearbox cover (see Pl. 52 and 55).
REMARK - In order to carry out this operation, the selector fork return spring thrust cups should not be fitted.
30 To adjust the 4th speed control cylinder
a) With the help of an assistant, bring the base of the 3rd speed synchro (90) as far as possible into contact with
the thrust washers of the pinion by pushing the selector shaft (61) and holding the shaft in this position. Put the
rear pipe assembly in position (do not fit the adjusting washers between the 4th speed control cylinder and the
joint face on the gearbox cover).
b) Hold the pipe assembly and, with a set of feeler gauges, measure the clearance (at several points) between the
control cylinder and the gearbox cover, for example: 1.35 mm. In order to obtain a clearance of 0.1 to 0.3 mm
between the face of the synchro and the thrust washer, it is necessary to fit an adjusting washer with a thickness
between:
1.35 – 0.3 = 1.05 mm and 1.35 – 0.1 = 1.25 mm.
c) Select from the adjusting washers sold by our Spare Parts Department, a washer of the appropriate thickness. In
the example : a suitable washer would be 1.1 mm.
31 To adjust the 3rd speed control cylinder.
Proceed as in paragraph 30 above, after having engaged the 4th speed as far as possible (push the shaft (61)
towards the front).
32 To adjust the 1st speed control cylinder.
Put the 3rd and 4th speed shaft in the neutral position. Engage the 2nd speed as far as possible by pushing on
the shaft (77). Proceed as mentioned in paragraph 30 above. The clearance obtained between the synchro and
the reverse pinion should be between 0.30 and 0.65 mm.
33 Place on each of the cylinders, the washers determined in paragraphs 30, 31 and 32 and adjust the pipe assembly
fixing clamps (see paragraphs 24 to 26, this operation for the front pipe assembly and paragraphs 27 to 29, this
operation for the rear pipe assembly).
34 Fit the selector fork return spring cups (spring compressor 1798-T, see Pl. 56, fig. 1) . . . . . . . . . . . . . . . . . . . . . . Spring compressor
1798-T
TO BLEED THE HYDRAULIC GEAR SELECTOR
35 Apply the parking brake. Put the front of the car on stands and start the engine. Pass the gear lever successively
through each gear. Operate the auxiliary clutch control several times, the gear selector lever being in the
neutral position. Carry out this operation for 10 to 15 minutes.
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