Buick LeSabre 1965 Service Manual page 132

3 - 5 6 4-BARREL CARTER ENGINE FUEL AND EXHAUST
Figure 3-74—Checking Float Level
each float (at outer end) and air
horn gasket using 7/32" gauge
or a 7/32" drill. See Figure 3-74.
To adjust, bend float lever. After
any a d j u s t m e n t , recheck float
alignment.
11. Adjust Float Drop. With air
horn held in upright position,
measure vertical distance from
air horn gasket to outer end of
each float using a scale. Bend
float arm tang as required to
obtain 3/4" measurement. See
Figure 3-75.
12. Place lower pump spring in
pump well (opposite choke pis-
ton housing). Install air horn as-
sembly on main body, using care
to avoid distortion of floats. In-
stall air horn screws and tighten
evenly. (Two longer screws go
in middle holes.) Check auxiliary
valve assembly by opening from
above. Auxiliary valves must be
perfectly free in any position.
13. Install choke shaft in air horn
with attached lever toward choke
.VMEASURE HERE
* USING 3'4 GAUGE
Figure 3-75—Checking Float Drop
piston housing. Install choke
valve with markings up and in-
stall screws loosely. Align choke
valve by working choke shaft
endwise w h i l e maintaining an
upward pressure on choke shaft
lever. Tighten and stake choke
valve screws. Check for uniform
clearance and f r e e d o m from
sticking, as improper fit or bind-
ing may c a u s e hard starting.
Mechanism is free if choke valve
will fall open from its own weight.
14. Install assembled fast idle
rod and choke lever by first en-
gaging fast idle rod in fast idle
cam. Then place lever over end
of choke shaft so that it points
toward accelerator pump with
choke closed.
15. Install two step-up piston
springs. Install each assembled
retainer spring. Carefully push
down on each step-up piston and
rod until rod enters metering jet.
Use care to avoid bending step-
up rods. Then i n s t a l l cover
plates, holding plates down while
tightening screws.
16. Install upper end of pump rod
in pump arm. Install spring and
retainer on rod, making sure that
bronze washer is on opposite side
of pump arm from spring.
17. Install upper end of choke rod
in choke shaft lever, using pin
spring on rod.
3 - 2 5 EXTERNAL
ADJUSTMENT OF
CARTER 4-BARREL
CARBURETOR
1. Adjust Choke Piston Linkage.
Inside choke piston bore on left
side, about 1/2 inch down, is a
small slot. Insert 1/8 inch bent
end of .026" wire gauge into upper
end of slot; then close choke valve
by pressing on piston lever in
choke housing until piston stops
against gauge. Check opening be-
tween upper edge of choke valve
and inner wall of air horn using
.105" Wire Gauge. See Figure
• 105" GAUGE
Figure 3-76—Choke Piston Adjustment
3-76. If adjustment is required,
place Tool J-5197 on lower sec-
tion of choke rod and bend as
necessary.
2. Install baffle plate in choke
piston housing. Install thermo-
static coil and housing assembly
with gasket. Rotate clockwise
until index m a r k s align and
choke valve is just closed, then
tighten screws and retainers.
3. Adjust Pump. Push fast idle
cam aside and back out throttle
stop screw until throttle valves
seat in throttle bores. With pump
rod in center hole, measure from
air horn to top of plunger shaft
with scale. Use proper gauge to
measure 7/16" in center hole for
all single 4-barrel carburetors,
1/2" in center hole for all front
dual 4-barrel carburetors, or
1/2" in inner hole for all rear
dual 4-barrel carburetors. See
Figure 3-77. Bend pump rod at
Figure 3-77—Pump Adjustment