Buick LeSabre 1965 Service Manual page 113

ENGINE FUEL AND EXHAUST
2-BARREL ROCHESTER 3 - 3 7
NOTE: Top of retainer must be
flush with flat of bowl casting.
2. Install two main well inserts.
Align flat on lip of insert with
flat in recess on top of main well.
Install venturi cluster with gas-
ket. Install venturi cluster screws
and tighten evenly and securely.
Make sure center screw is fitted
with fibre gasket and special
smooth shank screw is used.
3. Install two main metering jets,
power valve gasket and power
valve.
4. Install small aluminum inlet
check ball in pump inlet in the
bottom of pump well; insert pump
return spring and center in well
by pressing downward with finger.
5. Install pump inlet screen in the
bottom of float bowl.
c. Assembly of Air Horn
1. Place new choke housing gas-
ket in position on choke housing
and install choke housing using
two Phillips head a t t a c h i n g
screws.
2. Install choke lever and collar
onto choke shaft. Tang on choke
lever faces away from air horn
and is on top of choke trip lever.
3. Install choke shaft and lever
assembly into the air horn. Choke
rod hole in the choke lever faces
fuel inlet side of carburetor.
4. Install choke valve in choke
shaft so that letters "RP" will
face upward in finished carbu-
retor. Install two new choke valve
attaching screws but do not
tighten securely until choke valve
is centered. Center choke valve
on choke shaft by holding choke
valve tightly closed; then slide
choke shaft in to obtain approxi-
mately .020 clearance between
choke trip lever and choke lever
and collar assembly. Tighten
choke valve screws securely and
stake lightly in place. Choke valve
will be perfectly free in all po-
sitions when installed correctly.
5. Install outer pump lever and
shaft assembly into air horn with
lever pointing toward choke shaft.
Install i n n e r pump arm with
plunger hole inward and tighten
set screw securely.
6. Attach pump plunger assem-
bly to the inner pump arm with
pump shaft off set pointing in-
ward and install retainer.
7. Install needle seat screen on
the needle seat and assemble
float needle seat and gasket in
air horn. Tighten needle 'seat se-
curely, using a wide b l a d e d
screwdriver.
8. Install power piston into vac-
uum cavity. Lightly stake piston
retainer washer in place. Piston
should travel freely in cavity.
9. Install air horn gasket on air
horn, fitting gasket over guide
pin.
10. Attach float needle to float.
Carefully position float and in-
sert float hinge pin. Drop tang on
rear of float arm should point
downward toward air horn.
11. Fuel inlet fitting should be
installed if removed.
12. Float level adjustment.
With air horn assembly inverted,
measure the distance from the
air horn gasket to lower edge
(sharp edge) of float seam at end
of float, using the .594 inch float
level gauge, as shown. Bend float
arm as required to adjust float
level. See Figure 3-34.
BEND HERE TO
ADJUST FLOAT L E V E L
GAUGE SHOULD JUST TOUCH
EDGE OF FLOAT SEAM
13. Float drop adjustment.
With air horn assembly held up-
right, measure distance from
gasket to bottom of float pontoon
at outer end, using 1-29/32 inch
float drop gauge for scale, as
shown. Bend float tang as re-
quired to adjust float drop, as
shown in Figure 3-35.
14. Carefully place air horn as-
sembly on float bowl, making
certain that the pump plunger is
properly positioned in the pump
well. Lower the cover gently,
straight down, then install air
horn to float bowl a t t a c h i n g
screws. T i g h t e n evenly and
securely.
NOTE: Longer air horn screw
goes in top of pump housing.
15. Install choke rod into choke
lever and fast idle cam. Install
fast idle cam screw and tighten
securely. See Figure 3-36 for
proper installation.
16. Install accelerator pump roa
in outer hole and into throttle
lever and install retainers.
17. Assemble choke piston to the
choke lever and link assembly,
retaining with piston pin. Piston
pin hole in side of choke piston
faces toward air horn. Install
choke piston into the choke hous-
ing bore and attach choke piston
lever to the end of the choke
shaft, making sure flats on lever
line up with flats on choke shaft.
Install retaining screw and tighten
securely.
MEASURE SPECIFIED DISTANCE
_ SURFACE TO
FLOAT
BEND FLOAT TANG
TO ADJUST FOR
PROPER SETTING
SCRIBED MARK ON
GAUGE INDICATES
PROPER SETTING
Figure 3-34—Float Level Adjustment- Figure 3-35—Float Drop Adjustment