Saab 95 1967, Service Manual

Page: 187 / 610

CHECKING AND ADJUSTING OF VACUUM CONTROL
(PULL-DOWN) OF CHOKE VALVE
Remove the bi-metallic spring housing. Press up the diaph-
ragm rod for the vacuum control and hold it in this posi-
tion. Turn the primary choke valve towards the closed
position until obvious resistance is felt. By means of a
drill, measure the distance between the upper edge of the
choke valve disc and the carburetor housing. The distance
should be 0.13 i 0.007 in. (3.3 i 0.2 mm). Make any ad-
justments by means of the adjusting screw above the dia-
phragm chamber.
as»:
CHECKING THE VACUUM CONTROL, CHOKE VALVE
1. Adjustment screw
SETTING THE AUTOMATIC CHOKE
The installation line on the rotatable bi-metallic spring
housing should concide with the central mark of the five.
The bi-metallic spring is then set so that the choke will
open completely when the temperature of the coolant
exceeds 178—187°F (60—6500). Rotation clockwise
away from the basic setting will cause the choke to open
later.
It is essential that the choke valve spindles move freely,
if the automatic choke is to operate correctly.
INSTALLATION
MARK, AUTOMATIC CHOKE
CHECKING AND SETTING THE FAST IDLING SPEED
Start the checking with the engine warm at a standstill.
Turn the throttle lever so that the choke valve can be
closed completely. Then, first release the throttle lever
and then the choke valve. This procedure sets the throt-
tle valve in the fast idling position without the aid of the
bi-metallic spring.
Note! Do not now move either the throttle control or
the accelerator.
Start the engine and check the fast idling speed which
should be 3 000—3 200 rev/min. Make any necessary ad-
justment by backing off the screw in the dual lever pro-
jecting from the choke housing, whereupon the relative
position of the lever sections can be adjusted.
FAST IDLING ADJUSTING SCREW
231 ~23