Page 171
4, If the measured amount of fuel does Not lie withi
the stipulated tolerances, adjust the acaeleean ithin
setting by bending or straightening the Gannett mabe
lever. Bending the lever increases the pump pe
Conversely, if the lever is traightened out the
capacity is reduced. , Pump
REERERRAAU UNS ee | ‘
CONNECTING ROD LEVER
SETTING OF FLOAT CHAMBER VALVE
1. The measurement "A" = 0.32—0.40 in. (8—10 mm) is
measured with the throttle valve wide open.
2. The measurement “B” = 0.008—0.012 in. (0.2—0.3
mm) is measured with the throttle valve fully closed.
MEASURING DIMENSIONS “A” AND "“B™”
A = 0.32—0.40 in. (8-10 mm)
8 = 0.008~0.012 in. (0.2—0.3 mm)
OAS obtained by bend-
owards the ten
Bis obtained
3. Adjustment of measurement
ing the lower part of the lever stop t
sion pin. Adjustment of measurement
by bending the lever at the push rod.
SABRE
Febr 1977
ADJUSTMENT OF MEASUREMENTS “A” AND "B”
SETTING OF AUTOMATIC CHOKE
Normally, the functioning of the automatic choke should
not be altered in any way. The setting mark on the ther-
mostatic spring housing to be in line with the center mark
on the automatic choke housing. The free end of the
thermostatic spring to be fitted in the center slit of the
thermostatic spring lever.
FITTING THERMOSTATIC SPRING
LOCATION OF THERMOSTATIC SPRING HOUSING
231-7
penne
Wen
Page 172
static spring housing. See to it that the
3. Fit the thermo
e correct position.
Setting the choke val
alve vacuum adjustment a sewiesn es |
é m, by inserting a gauge, see
| eck position of step ca
A. Carburetor without modulating choke (C8 GH-G, 71 4. en 2. In this position, the mark on the 3rd catch
p hall be exactly in front of the stop
TW—JB, 71 TW—JC and USA-C8 GH—H) s
1. Remove the thermostatic spring housing. of the step cam tle valve lever.
2. Depress the vacuum piston fully. Move the choke wee
valve towards closed position, until the tongue of the
thermostatic spring lever contacts the vacuum piston
lever. In this position, the opening of the choke valve
shail be 0.18—0.20 in. (4.5—5.0 mm). As gauge, 4
dog of the
drill may be used,
CHECKING POSITION OF STEP CAM
Adjustment by bending the link rod.
CHECKING THE SETTING
ADJUSTMENT OF LINK ROD
Adjustment by bending the tongue of the thermostatic
spring lever.
ADJUSTMENT OF THERMOSTATIC SPRING LEVER TONGUE
231-8
SAAB
Febr 1977
Page 173
8. Carburetor with modulating choke
TF—KGA, 72 TF—KEA, USA-70 T
TW-LA, USA-72 TF—KEA ang U
1, Remove the thermostatic sprin
9. Position a piece of 0.049”
(71 TW~JD, 72
W—AA, USA-71
SA-72 TF~KF A).
g housing,
. (1.01 mm) thick wire in
ton and hold the vacuum
and wire in Position.
the inner slot above the pis
piston lever to keep piston
ADJUSTMENT OF THERMOSTATIC SPRING LEVER TONGUE
5. Check position of step cam, by inserting a gauge, see
point 3. In this position, the mark on the third catch
of the step cam shall be exactly in front of the stop
dog of the throttle valve lever.
SETTING OF CHOKE VALVE
3. The lower opening of the choke valve shall now be:
Standard carburetors 0.11 + 0.008” (2.8 + 0.2 mm),
USA carburetors 0.08—0.10’’ (2.0—2.5 mm). Check
the opening with a drill or similar.
CHECKING POSITION OF STEP CAM
Adjust by bending the link rod.
CHECKING THE CHOKE VALVE OPENING
5 . ue,
4. Adjust by bending the thermostatic spring lever tong
ADJUSTMENT OF LINK ROD
SAAB 231-9
Febr 1977
ae
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Vid)
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Page 174
bed]
cee 2 ee
Setting of the mechanical Opening of the choke valve
1. ee the throttle valve fully. This forces the choke
i ve to Open, in the way that an arm (B) on the
throttle spindle contacts a stap (A) on the step cam.
1 |
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.
CHECKING CHOKE VALVE OPENING
3. Adjustment by gently bending the stop (A) on the
step cam.
ey SAAB
Checking the automatic choke
(Carburetor installed in the car)
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 thermo-
static spring when the engine is cold.
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
and that the step cam engages the highest (fourth)
catch,
3. Start the engine and let it run with the step cam set
at the highest (fourth) catch.
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 + 0.008” (2.8 + 0.2 mm),
USA carburetors 0.08—0.10" (2.0—2.5 mm). Also
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 va
uum piston or between the choke housing and the cat
buretor.
Febr 1977
_
Page 175
CHECKING THE SETTING
Adjustment by bending the tongue of the thermosta-
tic spring lever.
ADJUSTMENT OF THERMOSTATIC SPRING LEVER TONGUE
FAST IDLE ADJUSTMENT
1.
5.
6.
BENDING THROTTLE VALVE STOP
Run the engine until it reaches normal working tem-
perature. Remove the air cleaner.
. Connect a tachometer,
» Hold the throttle valve shaft and the step cam so, that
the stop dog contacts the mark on the third catch of
the step cam.
- The engine speed shall now be 1 800—2 000 rev/min.
co adjusting, bend the stop of the throttle valve
shaft,
S218)
Check the fast idle setting.
Fit the air cleaner.
IDLE ADJUSTMENT
NOTE! This adjustment should be made when the engine
5. Depress the accelerator pedal. The engine speed should
slow down when the step cam moves down to the third
catch. Check that the mark < on the third catch of the
step cam is exactly opposite the stop on the throttle
spindle. If necessary, adjust the connecting rod so that
the correct position is obtained.
6. Stop the engine. Depress the accelerator pedal fully
and check that the choke valve opens 0.19—0.23 in.
(4.85.8 mm). If necessary, adjust by carefully bend:
ing the stop on the cam disc.
7. Remove the rubber band and refit the cover of the
automatic choke if this item has been removed. Check
i ition. Warm up
that th s up the correct position. :
oe ‘ol screw setting,
the engine and check the volume contr
the idling speed and the fast idling speed.
has been warmed up to normal working temperature. De-
pending on the mileage, adjustment should be preceded
by checking the electrode gap of the spark plugs, the ig-
nition setting and the valve clearance.
1. Reduce the engine speed so that the engine runs as
slowly as possible or at max. 500 rev/min.
2. Adjust the volume control screw until the engine runs
as smoothly as possible.
3. Switch the headlights on (high beam) and the speed
to 800—900 rev/min with idle adjusting screw.
231~11
Febr 1977
Page 176
Carburetor, make Ford, models
1976 and 1977
REMOVAL
1, Remove the air cleaner.
2. Disconnect the fuel line, the ventilation hose and the
vacuum hose from the carburetor.
3. Unscrew the choke control from the carburetor and
unhook the throttle cable.
4. Remove the carburetor.
REMOVING THE CARBURETOR
5. Blank off the end of the inlet channel.
Dismantling
1. Undo the float chamber cover retaining bolts and
lift off the cover, at the same time unhooking the
link to the choke.
THE FLOAT CHAMBER COVER IS LIFTED OFF
231-12 SAAB
2 oOo N
t. Remove the ball and the weight
by inverting the
Remove the gaske
from the acceleration fuel passage
housing.
BALL AND WEIGHT IS REMOVED
Remove the acceleration pump cover bolts and re-
move the cover, diaphragm and spring.
Remove the connecting rod from between the
throttle valve lever and the acceleration pump. Un-
bolt the acceleration pump arm from the throttle
shaft.
Remove the mixture screw and the idling screw and
save the springs. On 1977 model cars, first remove
the seal from above the mixture adjusting screw.
Make a hole in the top of the plastic plug and then
work it free.
Remove the throttle vaive.
File away any burrs around the screw holes in the
throttle shaft. Remove the shaft.
Remove the float. Unscrew the needle valve, saving
the filter.
Unbolt the choke lever and save the spring.
Remove the main jet.
Dismantle the choke valve.
File off any burrs around the screw holes in the
choke valve shaft. Withdraw the shaft.
Febr 1977
Page 177
8
CARBURETOR, EXPLODED
1.
9.
10.
11.
12.
Float chamber with throttle valve
_ Float chamber cover with choke valve
Main jet
. Float valve
Float
Ball and weight, acceleration fuel passage
. Acceleration pump
_ Choke arm with fast idling cam
Choke wire bracket
Idling screw, throttle valve
Mixture screw, idling fuel, model 1976
Mixture screw, idling fuel, model 1977
ASSEMBLY
Clean the carburetor. Blow compressed air through all
passages and jets. Replace gaskets and any defective parts.
1
Install the throttle valve shaft in the carburetor
housing. Mount the acceleration pump lever to the
throttle shaft with the side marked “O facing out-
wards.
FITTING THE ACCELERATION PUMP LEVER
é that when
Install the throttle valve in such i oars will face
the valve is closed, the two punch s alvcconitt adn
down. Ensure that the valve is corr Pooh
the closed position before tightening
Check that the shaft moves freely-
INSTALLING THE THROTTLE VALVE
Install the idling screw and mixture screw complete
with springs. Model 1977: After the carburetor has
been adjusted, reseal the mixture adjusting screw.
Hook the acceleration pump rod onto the throttle
valve lever.
Install the diaphragm and spring of the accelera-
tion pump.
N.B. The larger end of the spring should face to-
wards the diaphragm. Hook the connecting rod
onto the pump arm and fit the cover.
Install the choke valve shaft. Ensure that the valve
centres correctly in the closed position before
tithtening the bolts. Check that the shaft moves
freely.
INSTALLING THE CHOKE VALVE
Shaws
Febr 1977
Bolt the main jet in position.
Screw in the needle valve together with the fuel
filter. Install the float and check the float level.
See “Checking and adjustment of the float level’’.
Insert the ball and the weight into the acceleration
pump passage.
231-13
eee
Page 178
Oe el
BALL AND WEIGHT ARE PLACED IN THE ACCELERATION
PUMP PASSAGE
10. Fit the carburetor housing with a new gasket and
replace the float chamber cover. Insert the bolts
and mount the choke cable bracket. Tighten the
cover.
11, Install the choke lever together with spring, at the
same time, hooking the link onto the driver on the
choke valve.
INSTALLATION
1. Fit new gaskets between the intermediate flange and
the carburetor.
Mount the carburetor.
3. Connect the throttle cable and choke cable to the car-
buretor.
4. Connect the fuel line, ventilation hose and the vac-
uum hose to the carburetor.
5. Install the air cleaner.
N
SETTING
Checking and adjustment of float level
1. Remove the float chamber cover (see under ‘’Disman-
tling’’).
2. Hold the float chamber cover vertically so that the
float closes the needle valve. However, the spring-
loaded ball of the needle valve should not be de-
pressed.
The distance between the sealing edge and the bottom
of the float should be 1.12 in. (31 mm) (see illustra-
tion).
231—14
3izlimm
Ss, x
1220.04 in 4
;
“toe
FLOAT LEVEL
To adjust the distance, carefully bend the lever stop
at the arrow. The distance can be measured by means
of a vernier scale or by means of a gauge made from
a piece of metal (see illustration),
Ly
aa
60
31
<
“SAVER
on SS SS eee
<——
|
'
—_> $ 5299
GAUGE FOR MEASURING OF FLOAT LEVEL
ME
ASURING THE FLOAT LEVEL WITH A GAUGE
Febr 1977
Page 179
Adjusting the acceleration pump
I
Ne
Using a funnel and a hose connected t
fill the float chamber with fuel.
Completely unscrew the throttle Valve
full pump strokes are obtained. Opent
valve a few times to fill the fuel Passag
Hold the carburetor over a measurin
nel as shown in the illustration, Ope
valve gradually ten times. Compare
quantity of fuel with the specificati
group 0.
0 the inlet Pipe
SCrew so that
he throttle
es,
9 glass with fun.
n the throttle
the measured
On Given in
—
<> =
CHECKING THE SETTING OF THE ACCELERATION PUMP
4. If the measured fuel quantity does not lie within the
ADJUSTING THE ACCELERATION PUMP SeTT
prescribed values, adjust the accelerator pump setting
by bending or straightening the pump connecting rod.
When the rod is straightened the pump capacity will
increase.
ING
Febr 1977
Checking and adjusting of fast idling
» Remove the air cleaner.
- Run the Engine until hot and check the idling setting.
* Hold the choke valve in the fully open position with
One hand, at the same time, turning the choke into
the position where the choke valve starts to close.
CHECKING FAST IDLING SETTING
Read off the engine speed and refer to the specifica-
tions in group 0.
. Adjustment is made by bending the tongue on the
throttle driver connected to the cam on the choke
lever.
CAUTION
The vacuum control unit in the distributor may
cause an increase in the fast idling speed. Before
checking the fast idling speed, therefore, discon-
nect the vacuum hose from the vacuum control
unit. The deceleration valve can cause higher fast
idle speed. Squeeze together the hose between the
carburetor and the deceleration valve when
checking and setting the fast idling speed.
231-15
Page 180
oe ee
Checking and adi
g adjustment of choke valve stop On mode! 1977 a modified mixture adjusting screw has
been introduced which ts sealed by means of a plastic
i SE onic to the limit of its travel against plug. Before any adjustment can be made, the plastic
2. Using a drill hing . cable bracket, plug must be removed (and thereby destroyed) and then
open GAS a au | the valve in this Position can replaced, as follows:
Adjustment is ee, - at the bottom. Using a small screwdriver, make a hole in the top of the
-e e by bending the stop on the brack- plug and then work it loose.
REMOVING THE PLASTIC PLUG
ADJUSTING THE CHOKE FLAP STOP
After the adjustment, fit a new (blue) plug by means of
Idling adjustment, engine speed and CO-value a drift and hammer.
N.B. Adjustment should be carried out with the engine
at its normal running temperature and, with due consid-
eration given to mileage, the adjustment should be pre-
ceded by a check on spark plug gaps, the ignition setting
and the valve clearance.
1. Ensure that the snorkel on the air cleaner is in the
“Summer” position.
2. Connect the tachometer and CO meter. Switch on the
headlights on low beam.
3. Adjust the engine speed and CO value by means of the
throttle valve screw and the idling mixture screw.
FITTING A NEW PLASTIC PLUG
ADJUSTING THE IDLING SETTING
1. Screw
2. Idling mixture screw
231-16 Febr 1977