Buick LeSabre 1965 Service Manual page 131

ENGINE FUEL AND EXHAUST
4-BARREL CARTER 3 - 5 5
7. Remove pin spring from pump
link. Remove link and reinstall
pin spring. Remove pump plunger
assembly from air horn. Remove
air horn gasket.
8. Remove l o w e r pump spring
from main body. Remove thermo-
static coil and housing assembly,
gasket, and baffle plate from
choke piston housing. Remove
screw from end of choke piston
housing shaft and remove washer.
Then remove choke piston, lever,
link and pin assembly.
9. Remove piston housing from
main body. Remove small round
gasket from piston housing. Re-
move choke shaft, lever, and rod
assembly from piston housing.
10. Remove idle mixture adjust-
ment screws and springs.
11. Remove thermostatic valve
and gasket. See Figure 3-66.
12. Remove both secondary ven-
turi assemblies and gaskets. Re-
move auxiliary valve assembly.
Remove both primary venturi as-
semblies and gaskets. Notice that
each venturi assembly is different
and can be assembled in only one
location. Notice also that primary
venturi assembly gaskets are dif-
ferent from secondary gaskets.
13. Remove pump jet housing and
gasket. Remove pump discharge
check needle.
14. Remove all four metering
jets. Notice that the primary jets
have larger orifices than the
secondary jets. This is because
step-up rods are used only in the
primary jets.
15. Remove pump intake ball
check assembly.
Unless passages in main body
appear to be clogged with carbon
or gum to such an extent that
penetration of cleaning solution
is doubtful, it is seldom neces-
sary to remove passage plugs.
For normal cleaning and inspec-
tion, it is not n e c e s s a r y to
remove primary or secondary
throttle valves and their connect-
ing linkage. However, if throttle
linkage is worn or damaged,
service replacement parts are
available.
3 - 2 4 ASSEMBLY AND
INTERNAL
ADJUSTMENT OF
CARTER 4-BARREL
CARBURETOR
During assembly of carburetor
use all new gaskets and any ad-
ditional new parts found to be
necessary during inspection.
Calibrated p a r t s must be as
specified for carburetor CODE
number which is stamped in edge
of mounting flange at rear center.
1. Place main body in upright
position on bench or mounting
fixture. Install p r i m a r y and
secondary m e t e r i n g jets and
tighten securely. NOTE: The
primary jets are the two having
the larger orifices and are in-
stalled in the holes nearest the
center of the main body below
step-up rod holes in air horn.
2. Install pump discharge check
needle point down. Install pump
jet housing and gasket. Install
pump intake ball check assembly.
3. Install t h e r m o s t a t i c valve
using new g a s k e t . See Fig-
ure 3-66.
4. Install auxiliary valve assem-
bly with screw heads down. Then
install secondary and primary
venturi assemblies, using new
gaskets. NOTE: If a primary
venturi assembly does not fit in
place flush with top of main body,
it belongs on other side.
5. Install idle mixture adjustment
screws. Seat lightly and back out
3/4 turn, which w i l l provide
an average initial adjustment.
6. Install choke piston housing
shaft, lever and rod assembly in
piston housing with lever and rod
pointing away from heat pipe
connector. Install small round
rubber gasket in housing recess,
then install piston housing on
main body using three self tapping
screws. Install choke piston, pin,
link and lever assembly in piston
housing. Install piston lever on
flats of shaft in such a way that
inner and outer levers are point-
ing in same general direction.
Then install screw.
7. Place pump plunger assembly
in position in air horn and install
pump link. Install pin spring in
upper end of link. Invert air horn
and install new air horn gasket.
8. Install float needle seats and
gaskets. Install float needles,
floats, and lever pins, making
sure they are installed in original
locations.
9. Align Float - Sight down side
of float to determine if side is
parallel with outer edge of air
horn. If a d j u s t m e n t is neces-
sary, bend float lever by applying
pressure to end of float with
fingers w h i l e supporting float
lever with thumb. See Fig-
ure 3-73.
Remove any excess clearance be-
tween arms of float lever and
lugs on air horn by bending float
lever arms. Arms should also
be parallel to inner surfaces of
lugs. After aligning, each float
must operate freely.
10. Adjust Float Level. With air
horn inverted and air horn gasket
in place, check clearance between
Si
K
Fiji
^MINIMUM
iWITHOUT
f
V
THESE SL
MUST BE
J
CLEARANC
BINDING
IRFACES
!
X
PARALLEL"~nn
i l l
Figure 3-73—Float Alignment