Buick LeSabre 1965 Service Manual page 122

3 - 4 6 4-BARREL ROCHESTER
ENGINE FUEL AND EXHAUST
gasket. This cluster has no pump
discharge nozzles.
6. Install all four main metering
jets. These jets have tapered
seats and do not require gaskets.
NOTE: The primary jets are the
two having the smaller holes and
are installed in the pump side of
the body.
7. Install pump outlet check ball.
This is a steel ball and is larger
than the pump inlet ball. Install
pump outlet ball spring and spring
guide.
8. Install primary cluster assem-
bly, screws, lock washers, and
new gasket in pump s i d e of
carburetor.
9. Install new pump inlet screen
and retainer if old screen was
removed.
10. Install pump inlet check ball
(small aluminum) and pump re-
turn spring. NOTE: Never sub-
stitute a s t e e l b a l l for the
aluminum ball.
11. I n s t a l l power v a l v e and
gasket.
12. Assemble choke piston and
pin to choke piston lever and con-
necting link, making sure that pin
hole in piston is opposite from
tang on lever. Then install in
thermostat housing. Install inter-
mediate choke shaft lever, and
rod assembly in choke housing
with lever hanging down. Connect
choke piston lever to intermediate
choke shaft with screw. Do not
use lubricant of any kind on piston
or in cylinder.
13. Install thermostat housing on
throttle body using a new gasket.
14. Install pump plunger assem-
bly and boot in inverted air horn.
Install power piston assembly and
stake securely in air horn. Power_
p i s t o n must be f r e e in any
position.
15. Install new air horn gasket.
Install a fuel inlet strainer on
inlet side of each needle seat.
Install float needle seats and
gaskets.
16. Install primary and secondary
float assembly and torsion springs
on the air horn, retaining in place
with hinge pins. Make sure tor-
sion springs are installed cor-
rectly. See Figure 3-49.
17. Adjust Float Level. (Primary
and Secondary). With the air horn
inverted and air horn gasket in
place, measure the distance from
ADJUST TO 1 -13/32
GAGE FROM GASKET
SURFACE TO TOP OF
FLOAT
\ BEND FLOAT
ARM TO ADJUST
CENTER FLOAT PONTOONS IN GASKET CUTOUT
ALIGN HOLES IN
GASKET WITH
HOLES IN
AIRHORN CASTING
CENTER FLOAT
PONTOONS IN
GASKET CUTOUT
Figure 3-49—Float Adjustment
Figure 3-50—Float Alignment
the air horn gasket to the top of
the float, as shown in Figure 3-49.
18. Do not attempt to bend float
hanger next to the float pontoon as
breakage may occur.
19. Align pontoons to make sure
they do not rub side of carburetor
bowl. They are aligned correctly
when they are parallel and cen-
tered in the gasket cut-outs. See
Figure 3-50. Bend float arms to
align. Do not attempt to bend
pontoons at float arm attaching
point.
20. Adjust Float Drop. (Primary
and Secondary).
21. With the air horn held up-
right, measure the distance from
the air horn gasket to the bottom
of scribe line on the side of float
pontoon, as shown in Figure 3-51.
22. If an adjustment is necessary,
bend the tang at the rear of the
float arms toward the needle and
seat to decrease the setting; away
from the needle and seat to in-
crease the setting.
23. If any float setting is changed,
always recheck all other adjust-
ments and alignment of that float.
24. Install air horn assembly on
main body, using care to avoid
distortion of float assemblies and
making certain that pump piston
cup does not have any creases
or curled edges when it is in-
serted in cylinder. Install 13 air
horn screws. Tighten three inner
screws first for better sealing.