Model - Saab 95 1967 Service Manual

DECELERATION
VALVE

1.

Adjusting screw
2. Gasket
3. Spring
4. Valve
5. Body
6. Spring
7. Diaphragm
8. Bottom cover
9. Intermediate flange
Assembly is carried out in the reverse order.
Setting
Checking
NOTE
The air cleaner
Run the engine until normal
1.
2. Check that the deceleration valve is not working at
idling speed. This can be done by disconnecting one
of the hoses between carburetor and deceleration valve.
231—18
must be fitted.
operating temperature.
If the valve is open, Le. vacuum
the adjusting screw on the
be screwed further in until
nect the hose.
If the deceleration valve is
you will get a very fast idle
is not possible to adjust this
3. Connect a tachometer and
accordance with the specifications
4. Advance the engine speed to
throttle. Let down the throttle
the time as require to drop the
3 000 r/min to idle.
An engine fitted with a correctly
tion valve should drop from
4 to 6 seconds. (USA-version as from
7 to 8 seconds.)
Adjustment
1. Remove the air cleaner.
2. a. If the requisite time from
is more than the prescribed,
adjusting screw should be screwed clockwise until
the desired figure is reached.
b. If the requisite time is
adjusting screw should be screwed anti-clockwise
until the desired figure
ADJUSTING
THE DECELERATION
3. Fit the air cleaner and check the
If necessary, repeat the procedure until the requiSite
time is correct.
Failure of the diaphragm will allow air to pass from the
bleed hole in the cover, through the diaphragm and
straight into the inlet manifold. Normal adjustment of
idling speed is not possible. Replace the diaphragm if
combustion exhaust emission control is demanded. If
not, just cover up the bleed hole
is passing the valve,
deceleration valve has to
the valve is closed. Can.
working at idling speed,
(1 200—1 400 r/min). It
in a normal way.
adjust the idling speed in
in group O.
3 000 r/min with the
rapidly and measure
engine speed from
adjusted decelera-
3 000 r/min to idle in

model

1970
3 000 r/min to 900 r/min
the deceleration valve
less than the prescribed, the
is reached.
VALVE
requisite time again.
in the cover.
Fobr 1977