Checking The Cutting In Of The Control Valve - CITROËN ID 19 Repair Manual

184 OPERATION No. ID 391-O : Checking the pressure reserve units
ID
19
7
8
9
10
11
12
Checking the cutting-in of the control valve.
After a cut- out has been obtained, slightly undo the bleed screw (g) of the control valve in order to lower the
pressure indicated by the pressure gauge (M3) to 1564 p. s.i, (110 kg/cm2). Retighten the bleed screw "g"
and operate the pump; if there is any flow of liquid,
no cut-in has been effected.
Repeat this operation for a pressure of 1493 p. s. i. (105 kg/cm2).
Operate the pump. If there is no flow through the return-to-reservoir aperture "f" and the pressure rises on the
pressure gauge (M2) and (M3),
(105 and 110 kg/cm2).
cut-in has been effected for a pressure between 1493 p. s.i. and 1564 p.
s.i.
If there has been no successful cut-in,
repeat the procedure at a pressure of 1422 p. s.i. (100 kg/cm2).
Cut-in must occur between 1422 p. s. i.
and 1564 p. s.i. (100 and 110 kg/cm2).
NOTE
1. If the cut-/in pressure is outside the limits given above,
the number of washers
(9)
must be increased or
reduced (see Pl. 85, fig. 1).
2. This check can also be carried out on the car.
Release the pressure by unscrewing the bleed screw "b" of the test bench pump and the bleed screw "g" of the
control valve. Remove the pipes (S) and (J) and the plug (L).
CHECKING THE INITIAL PRESSURE OF AN ACCUMULATOR OR SUSPENSION SPHERE
(see Pl. 132).
For this operation the test bench must be prepared as shown in PI. 125 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove the accumulator.
Screw on the union (K). Insert a seal. Note the number engraved on the plug
of
the accumu$ttor. This number
indicates the pressure 924 p. s-i. (65 kg/cm2). Connect the union (K) to the aperture "a" of the pump using
pipe (HI.
Tighten the bleed screw "b". Operate the pump to raise the pressure. Note the pressure gauge needle. The
pressure at first does not seem to rise and then rises rapidly,
and remains steady at the pressure of the
accumulator.
NOTE - At a temperature of 68'F (20°C) this pressure must be equal to
924
* 70 p. s. i. (65
t 5
kg/cm2). The
t 28.5
- 15
pressure of a front suspension sphere must be 838 _ 213 p. s.i. (59
'_ lt kg/cm2),
while the pressure of a
t 28.5
rear suspension sphere must be 369 _ 142
p. s.i. (26 Tli kg/cm2).
Release the pressure by unscrewing the bleed screw "b". _
Remove the pipe (H) and the union (K).
TOOLS
Test bench 2290-T