Checking The Valve Of The Suspension Pump For Leakage; Checking A Pressure Control Valve On The Car - CITROËN ID 19 Repair Manual

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OPERATION No. ID 39 1 - 0 : Checking
the
pressure reserve units
ID 19
PARTICULAR POINTS.
Checking the valve of the suspension pump for leakage (bench test).
Under a pressure of 2133 p.s.i. (150 kg/cm?), the needle of the pressure gauge should remain stationary.
Pressure control valve bench test.
Checking the cutting out of the control valve.
Raise the pressure until the fluid spurts from the return to the reservoir aperture. At this precise moment, read the pressure which should be 1849 p.s.i.
to 1991 p.s.i. (130 to 140 kg/cm').
Checking for leakage.
After the valve has cut-out, there should be
no
fall in pressure.
Checking the cutting-in of the control valve.
Slightly
unscrew
the bleed screw of the control valve, in order to lower the pressure to 1564 p,s.i. (110 kg/cm") and then tighten the bleed screw.
Operate the pump, if there is any flow of fluid, the valve has not cut-in.
Repeat the operation under a pressure of 1493 p.s.i. (10.5 kg/cm'). If there is no flow of fluid and the
needle
of the pressure gauge begins to rise
between 1493 p.s.i.
and 1564
p.s.i. (105 to 110 kg/cm") th e control valve has cut in; if
not
repeat the operation under a pressure of 1422 p.s.i.
(100 kg/cm2). The cut-in should be between 1422 p.s.i. and 1564 p.s.i. (100 to 110 kglcm2).
Checking the initial pressure of an accumulator on suspension sphere.
Connect the threaded union
on
the accumulator from a 0 to 1422 p.s.i. (100 kg/cm2) p ressure gauge. Operate the pump, the pressure rises rapidly,
then stabilises at a pressure which is the initial pressure, which should be 924 p.s.i. 2 :F, p.s.i. (65 7 & kg/cm"> at 20" C.
For a
front suspension sphere this pressure should be 838 + :f;' p s i (59 ? ;, kgg/cm2>, while
for
a rear suspension sphere it should be 369 + $' . . .
p.s.i. (26 ? :, kg/&).
Checking a pressure control valve on the car.
Checking the cutting-out of the control valve.
Start the engine and tighten the bleed screw; check the reading of the pressure gauge at the
moment
when the valve cuts-out; this should be between
1849 p.s.i. and 1991 p.s.i. (130 to 140 kggicm2).
Checking the cutting-in of the control valve.
With the engine idling, slightly loosen the bleed screw, at the moment when the valve cuts in the needle remains steady then rises. The pressure when
the valve cuts-in (pressure shown at the moment when the needle changes direction) should be between 1422 p.s.i. and 1564 p.s.i. (100 and 110
kglcm2).
CHECKING THE VALVE OF THE SUSPENSION PUMP FOR LEAKAbE (see Pl. 128).
In order to carry out his operation the test bench should be prepared as shown in PI. 126 (test bench 2290-T) . . . . . .
Connect the pump aperture 1'~~' to the test bench orifice "a" using the pipe (S).
Tighten the bleed screw "b" and operate the pump to raise the pressure to 2133 p. s.i. (150 kg/cm2).
a) Check the needle on the pressure gauge; it must remain stationary or r&turn towards zero only very slowly
and almost imperceptibly.
TOOLS
Test bench 2290-T