Saab 95 1967, Service Manual

Page: 167 / 610

ADJUSIMENI or AUTOMATIC CHOKE
Adjustment of the automatic Choke invol
tions, viz. setting of the choke lights and
justment. These two tasks are described
Ves two opera.
fast-idling ad-
below.
Adjustment of choke flap
Temperature setting
The automatic choke is set for the choke valve to open
wide at a temperature of 60—6500 (140—1490F)_
The setting mark on the rotatable thermostat housing
must coincide with the middle one of the five fixed set-
ting marks comprising the adjustment range.
Turning clockwise makes the choke open later.
ADJUSTMENT
OF THE RMOSTAT HOUSING
Adjustment of thermostat housing emf removal T
1. Hook the bimetal spring onto the dr'ver cam-i tilt"
the thermostat housing the shortest way untl
ting marks coincide.
2. Check that the choke valve stretches toWa
closed position.
rds the
Fast-idling adjustment
1.
9’
9.
10.
set- 1'
am
Remove the air cleaner.
Operate the engine until it reaches normal working
temperature. Then switch on the headlights.
Connect a tachometer to the engine.
Adjust the engine to the correct idling speed, Le.
800—900 rev/min.
Close the choke valve 3 little, in order to make it
contact the ratchet wheel in the starting automat-
ics. Hold the choke valve in this position, and keep
pressing it towards the ratchet wheel.
Open the throttle valve cautiously, enough to allow
the choke valve to move to the next position. First
release the throttle valve cautiosly, and then the
choke valve. The step which serves to increase the
idling speed, is now in the first position (first step)
of the ratchet wheel.
The throttle control must not be touched at this
stage, as the ratchet wheel would then revert to the
neutral position. For safety’s sake, the control rod
should be pushed up hard with the fingers.
When the throttle valve is in this position, the en-
gine speed should be between 200—1 300 rev/min.
Adjust the length of the control rod.
To increase the speed = lengthen the rod
To reduce the speed - shorten the rod
NOTE
After having performed this adjustment, check that
the control rod does not jam in the throttle control
lever owing to twisting during tightening of the two
adjusting nuts.
In order to check the good functioning of all stages
of the fast-idling (see page 200—7), check the numb-
er of revolutions of the third step. Same shall be
2 600—3 000 rev/min.
Recheck the idling speed and adjust if necessary.
Disconnect the tachometer and install the air clean-
er. In principle, the above adjustments shall be per-
formed only if the engine is difficult to start at low
temperatures and when a check has shown that
there are not other faults in the system.
231—3