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ID
19
n
OPERATION
No.
ID
39 1 - 0 : Checking
the pressure
reserve
units
Op.ID
391-O
185
13
14
15
16
17
Switch
off
the
engine
and
allow
the
pressure
to
fall
by
undoing
the
bleed
screw
"g"
of the
pressure
control
valve.
CHECKING
A PRESSURE
CONTROL
VALVE
(on
the
car)
(see
Pl.
133)
For
this
operation
the
test
bench
must
be
prepared
as
shown
in
Pl.
126
(test
bench
2290-T)
. . . . . . . . . . . . . . . . . . . . . . . .
Release
the
pressure
by
unscrewing
the
bleed
screw
"g"
of
the
pressure
control
valve.
Disconnect
the
pipe
between
the
pressure
control
valve
and
the
connecting
pipe
to the
distribution
block
from
the
connecting
pipe
and
connect
the
end
of this
pipe
to
the
pressure
gauge
(M2)
using
pipes
(A
and
B)
. . . . . . . . . . . . . . .
Start
the
engine
and
tighten
the
bleed
screw
"g".
Read
the
pressure
on
the
pressure
gauge
(M2)
at the
moment
cut-out
occurs
(needle
of the
pressure
gauge
(M2)
remains
stationary).
This
pressure
must
lie
between
1849
p.s.i.
and
1991
p.s.i.
(130
and
140
kg/cm').
Checking
for
leakage
Watch
the
needle
of
the
pressure
gauge
(M2).
If
the
cut-in
valve
is
seating
correctly
there
should
be
no
drop
in the
pressure.
Checking
the
cutting
in
of
the
control
valve.
With
the
engine
idling
unscrew
the
bleed
screw
"g"
of
the
pressure
control
valve
very
slightly
in
order
to
reduce
the
pressure
very
slowly.
Watch
the
pressure
gauge
needle:
at
the
moment
the
valve
cuts-in
the
needle
seems
to become
steady
and
then
moves
upwards.
The
cut-in
pressure
(pressure
shown
at the
moment
the
needle
changes
direction)
must
lie
between
1422
p.s.i.
and
1564
p.s.i.
(100
and
110
kg/cm2).
NOTE
- If
it
fails
to
cut
in
or
does
so
only
with
difficulty
and
if there
is no
internal
leak
(see
paragraph
15),
the
number
of
shims
(1)
must
be
reduced
or
increased
(see
Pl.
85,
fig.
2) in
order
to
obtain
the
correct
clearance
"a".
Remove
the
pipes
(A
and
B)
and
connect
the
pipe
between
the
pressure
control
valve
and
the
connecting
pipe
to
the
distribution
block
to
the
connecting
pipe.
Tightenthebleed
screw
"g'%
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOOLS
I
'
.
Test
bench
2290-T
8 mm
spanner
Spanner
2219-T
or
2221-T
8 mm
spanner
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