DS 19 OPERATION No. DS 334-0 Checking and adjustments on the change speed control. Op. DS 334-0 227
TOOLS
21 Carry out the same procedure on the corresponding cylinder of the new pipe assembly. For this, the dimension
“d” = 15.8 mm.
22 In the example, in order to keep the same selector fork adjustment, it is necessary to reduce the thickness of the
shims (59) between the cylinder and the cover by : d’ – d = 15.8 – 15.5 = 0.3 mm.
If the dimension “d” measured on the new pipe assembly is smaller than the dimension “d” measured on the old
pipe assembly, it is necessary, on the contrary to increase the thickness of the shims by a thickness equal to the
difference measured (d-d’).
23 Carry out the same operations on the 1st speed cylinder of each of the pipe assemblies.
To adjust the clamp fixing the front pipe assemblies.
24 Fit the shims (59) determined in paragraph 22 on the cylinders.
25 (Cars produced before March 1957.) To determine the number of shims (58) to be fitted on the 1st speed cylinder.
a) Put the 3rd speed cylinder together with its adjusting shims (59) on the edge of a surface plate. By means of a
depth gauge, take the dimension “r” (see fig. 8). Carry out the same operation on the 1st speed cylinder to
obtain a dimension “s”.
b) The difference of the height is: r - s = t. Subtract from the dimension “t”, the thickness of the plates (57)
(each plate is 0.3 mm thick) to obtain the thickness of the shims (58) to be placed on the 1st speed cylinder
(tolerance = 0.3 mm).
26 (Cars produced since March 1957.) To determine the number of shims (99) to be fitted between the clamps (20)
and on the cylinders.
As indicated in paragraph 25 above, measure the dimension “r’” and “s’” (see fig. 3), in order to obtain the
difference of the height “t’”. 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 cylinders of the rear pipe assembly.
27 Only the central cylinder is adjustable (4th speed). Proceed as indicated in paragraph 22, this operation.
To adjust the clamp fixing the rear pipe assembly.
28 (Cars produced before March 1957.) (see fig. 8).
a) Put the 4th speed cylinder, together with the adjusting shims determined in paragraph 27 above, on the edge of a
surface plate. With a depth gauge, measure the dimension “r”. Carry out the same operation successively on
each of the outside cylinders, in order to obtain a dimension “s”.
b) The difference in height is : r – s = t. Subtract from the measurement “t”, the thickness of the plates (57) (each
plate is 0.3 mm thick), in order to obtain the thickness of the shims (58) to be placed on the outside cylinder
being measured (tolerance = 0.3 mm).
c) Carry out the same operation on the other outside cylinder.
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