DS 19 OPERATION No. DS 142-0 : Adjustment of the slow running. Op. DS 142-0 101
PARTICULAR POINTS
The adjustment should be carried out with the engine hot, choke closed, ignition control in the mid-way position.
The use of a revolution counter is indispensable. In practice, this adjustment should be carried out after the adjustment of the clutch drag (see
Op. DS 314-0.
2 Adjust the slowrunning on cars produced before March 1956 (accelerator control with 2 rods): 550 r.p.m.
4 Adjust the accelerated idling: 950 to 1,000 r.p.m. to the point where increased resistance is felt on the control, adjust only by turning on the
outside rod.
Adjust the slow running on cars produced since 1956 (accelerator control with 1 rod): 550 to 600 r.p.m., unhook the accelerated idling spring.
Adjust the accelerated idling: 900 ± 25 r.p.m. hook on the spring, work on the adjusting screw..
TOOLS
IMPORTANT REMARKS
a) The adjustment described above should be carried out with the engine hot. Make sure that the choke control is
fully closed and that the ignition control is in the midway position.
b) The use of a revolution counter is indispensable. Use the mechanical revolution counter 2434-T, connected to the
high pressure pump pulley, or the electric revolution counter 2436-T, connected to the yellow terminal of the
upper coil
1. MECHANICAL REVOLUTION COUNTERS
In order to compensate for an error due to belt slip or irregular running of the engine during the checking,
unscrew the bleed screw of the pressure control valve or place the manual height control lever in the low
position.
2. ELECTRIC REVOLUTION COUNTERS
The electric evolution counters should be checked periodically (periods varying according to use and quality).
If it is desired to use a commercial revolution counter, it should conform to the following specifications :-
- Large diameter graduated from 0 to 1500 r.p.m. maximum.
- Work on a contact breaker with two cams.
- Needle steady whilst in use.
ADJUSTMENT OF THE SLOW RUNNING (on cars produced before March 1956).
Accelerator control with 2 rods.
1 Make sure that the accelerator control works normally and that the spring returns the throttle butterfly to the closed
position.
2 Adjusting the slow running to 550 r.p.m. (see Pl. 26, fig. 4).
Only adjust the screw (2) of the throttle valve and the volume screw (3) controlling the richness of the mixture for idling.
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