Saab 95 1967, Руководство по обслуживанию

Страница: 174 / 610

Setting of the mechanical opening of the choke Valve Checking the automatic choke
1' Open the thrOttle valve fully. This forces the choke (Carburetor installed in the car)
valve to open, in the way that an arm (8) on the
t rattle spindle contacts a stop (A) on the step cam.
1. a. If the engine is cold, start checking as per point 2
below.
b. If the engine is warm, begin by removing the auto.
matic choke cover from the housing. Next, fasten
the lower screw and stretch a rubber band between
the screw and the lever where the termostatic spring
is normally located. The rubber band then performs
the same service as is normally done by the theme-
static spring when the engine is cold.
CHOKE
VALVE ARM (B) AND STEP CAM STOP (A)
2. When the throttle valve is fully open, the choke valve
shall open 0.19—0.23 in. (4.8—5.8 mm), which is
checked with a drill.
THE
THERMOSTATIC SPRING HAS BEEN REPLACED BY A
RUBBER BAND
2. Remove the air cleaner and depress the accelerator
pedal. Check that the choke valve closes completely
CHECKING CHOKE VALVE OPENING
and that the step cam engages the highest (fourth)
catch.
3. Start the engine and let it run with the step cam set
3. Adjustment by gently bending the stop (A) on the at the highest (fourth) catch.
step cam. 4. Check that the choke valve opens so that the distance
between it and the neck of the carburetor is 0.18—-
0.20 in. (4.5—5.0 mm). This is not applicable to car-
buretors with modulating choke, because the opening
is depending on the vacuum. The opening shall be:
Standard carburetors 0.11 i 0.008" (2.8 i 0.2 mm).
USA carburetors 0.08—0.10" (2.0—2.5 mm)- AISO
check the function of the choke valve by putting It to
the closed position and then releasing it. The choke
valve should then return rapidly to the original POSI'
tion (opening 0.18—0.20 in./4.5—5.0 mm).
If the choke valve does not open to the prescribed
amount, this may be due to incorrect adjustment or
to leakage, for instance at the bottom cover of the vac-
uum piston or between the choke housing and the car-
buretor.
231-10 Febr 1977