DS 19 OPERATION No. DS 142-0 : Adjustment of the slow running. Op. DS 142-0 102
TOOLS
Set the screw (2) to give the minimum opening of the secondary throttle which will allow the engine to idle evenly.
Turn the volume screw (3) to increase the richness of the mixture to give the highest speed at the throttle
opening already determined. In order to reduce the speed to that desired, unscrew the screw (2).
NOTE – After each alteration to the setting of the secondary throttle valve screw (2), give the throttle a flick open
and shut to ensure that the throttle returns fully to stop on the screw.
3 Checking the maximum opening of the throttle valve (see Pl. 46).
Remove the tube between the carburettor and the air cleaner-silencer. Press the accelerator pedal right down.
If necessary, adjust the maximum opening of the throttle valve by adjusting only on the inside rod (16) (engine
side)
Connect the tube to the carburettor.
4 Adjustment of the accelerator control rods (see Pl. 46, fig. 1).
Press down the accelerator slightly to the point where increased resistance is felt on the control. Hold the
accelerator in this position.
Check the speed of the engine, it should be from 950 to 1000 r.p.m.
If necessary, adjust the outside rod (17). In no circumstances, must the inside rod (16) be adjusted.
ADJUSTMENT OF THE SLOW RUNNING (on cars produced since March 1956)
Accelerator control with 1 rod and accelerated idling (see Pl. 28).
5 Adjusting the slow running :
a) Unhook the spring (13) by removing it from the support tube (14) (pull it upwards) to disengage it from the
accelerator control.
b) Adjusting the slow running on a Weber carburettor (see paragraph 2, this operation).
c) Adjusting the slow running on a Zenith carburettor (see Pl. 27).
Adjust the screw (36) and the screw (30) controlling the richness of the mixture for idling, by proceeding as
indicated in paragraph 2, this operation).
6 Checking the maximum opening of the throttle valve:
See paragraph 3. Adjust the accelerator rod.
7 Adjusting the accelerated idling (see Pl. 28).
Hook the spring (13) in position by pressing on the support tube (14).
Adjust the screw (15) in order to obtain a speed which exceeds the speed at which the clutch drags by 150 r.p.m.
(900 ± 25 r.p.m.).
NOTE – In practice, this adjustment should be carried out after the adjustment of the clutch drag (see Op. DS 314-0).
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