DS 19 OPERATION No. DS 314-0 : Checking and adjustments on the clutch control. Op. DS 314-0 171
TOOLS
15 Start the engine and note the pressure gauge (M1) : the needle should drop to a pressure of 420 p.s.i. (29 kg/cm
2
)
minimum.
If the pressure indicated by the pressure gauge is lower than 420 p.s.i. (29 kg/cm
2
), the hole of the 38 mm
diameter piston is partially blocked (when this hole is totally blocked, the pressure falls to zero). It is then
necessary to remove the front face of the hydraulic gear selector.
16 To remove the front face of the hydraulic gear selector, disconnect the flange of the low pressure pipe assembly.
Using a syringe, inject alcohol (only) into the hole in the 38 mm diameter piston and in the low pressure inlet
and return holes. Blow with compressed air and make sure that no rubber particles remain in the groove in
the bore receiving the 38 mm diameter piston.
IMPORTANT - During this operation, frequent checks of the pressure in the clutch control cylinder should be
made (indicated on the pressure gauge M2). The latter should not drop below 570 p.s.i. (40 kg/cm
2
).
ADJUSTMENT OF CLUTCH DRAG
17 In order to carry out this operation, the use of a revolution counter is indispensable.
Use a mechanical revolution counter 2434-T, driven by the high pressure pump pulley or an electric revolution
counter 2436-T, connected to the yellow terminal of the top ignition coil, (in the case of a contact breaker with
2 breakers) or on the outlet terminal of the coil (in the case of 1 breaker).
If one uses a mechanical revolution counter and in order to avoid errors in reading due, on the one part to belt
slip on the high pressure pump or, on the other part, to uneven running of the engine during the test, unscrew
the pressure control valve bleed screw or put the manual height control in the low position.
The electric revolution counters should be periodically checked (periods vary according to use and quality of
material).
The electric revolution counters should comply with the following conditions
- Large diameter dial graduated from 0 to 1500 r.p.m. (maximum).
- Operate on a contact breaker with two cams and four cams.
- Needle steady during operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical revolution
counter 2434-T
Electric revolution
NOTE - This adjustment should be carried out after checking and adjusting the clutch clearance (see paragraphs counter 2436-T
20 to 23, this operation), also the engine should be hot, choke control closed and the ignition control in the
midway position.
18 Put the car on a level surface.
Disconnect the spring (19) between the accelerator control and the clutch engagement control lever (21) from
the accelerator control (see Pl. 47).
Disconnect the plate (14) from the accelerated idling control (cars produced since March 1956) (see Pl. 28).
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