Model - Saab 95 1967 Service Manual

DELAY VALVE
A delay valve is mounted in
the carburetor and the vacuum
butor. The valve delays the
around six seconds. The ignition advance is therefore

~

delayed during acceleration and the emission of name
oxide (N0xl ,5 reduced.
DE LAY VALVE
Checking
Checking is carried out by means of a stop watch, a tacho-
meter and a stroboscope.
1. Connect the tachometer and
2. Let the engine run at normal
3. a. Have an assistant open the throttle valve suddenly
and let the engine run
Take the time from the
was opened.
b- Check the firing point using the stroboscope kg
The vacuum regulator should cut
(i two seconds) and the ignition advance should be
increased.
FaUItV delay valve should be replaced.
CHECKING THE DELAY VALVE
the vacuum passage between
control unit of the distri-
formation of a vacuum by
, .
stroboscope.
idling speed.
at around 3 000 r/min.
moment the throttle valve
'
in after SIX seconds
DISTRIBUTOR WITH DOUBLE ACTING VACUUM
CONTROL UNIT
u
SA-VersIon as from
tor
which de endin
p
advance. The distributor has also a double acting vacu-
um regulator. The
(connection 2) is controlled by the underpressure that is
present just above
ative to engine speed.
The inner part of the vacuum regulator
controlled by the
throttle and gives
closed. The hose
diate flange.
The membran surface
creasing the ignition advance when the underpressure is
equal in both vacuum lines.
h
t.
DISTRIBUTOR
UNIT
1. Connection for
2. Connection for hose from the intermediate flange
SAAB

model

1971
IS equnp ed WIth a centnfugalregulator
P ' t l
g on engine speed con re s
outer part of the vacuum
the throttle and adjusts the
(connection 2)
underpressure that is present
ignition advance when the throttle
is connected to the carburetor interme-
is bigger on the side which
WITH DOUBLE ACTING VACUUM
hose from the carburetor
the nition
9
regulator
ignition rel-
is
under the
is
is in-
$3103
CONTROL
342-13