Buick LeSabre 1965 Service Manual page 114

3 - 3 8 2-BARREL ROCHESTER
ENGINE FUEL AND EXHAUST
ROD I 1
^ * ^ > — TRANSMISSION
SWITCH PIN
CHOKE
LEVER
ss-
THROHIE
STOP
SCREW
Figure 3-36—Choke Linkage
18. Install insulator baffle into
choke housing.
19. Install new gasket on choke
cover assembly; then install as-
sembly to choke housing rotating
counterclockwise until the ther-
mostatic coil picks up the choke
piston lever and closes the choke
valve. Rotate cover until index
mark on cover aligns with the
index mark on choke housing.
20. Install three choke cover re-
taining screws and retainers and
tighten securely. With the index
markings aligned, the choke valve
should be lightly closed at 75°F.
3 - 1 7 EXTERNAL
ADJUSTMENT
OF ROCHESTER
2-BARREL
CARBURETOR
All adjustments on the carbu-
retor, except for float adjust-
ments, are made externally. For
float level and drop adjustments,
see Steps 12 and 13.
a. Pump Rod Adjustment
Back out idle stop screw and
completely close throttle valve
in bore. Place pump gauge across
PLACE GAUGE ACROSS TOP
AIR HORN RING
~
N
, . GAUGE LEG
< / \ | SHOULP JUST TOUCH TOP
o i l OF PUMP ROD
VALVES
ULLY CLOSED
Figure 3-37—Pump Rod Adjustment
top of carburetor air horn ring,
as shown, with 1-11/32 inch leg
of gauge pointing downwards to-
wards top of pump rod. Lower
edge of gauge leg should just
touch the top of the pump rod.
Bend the pump rod as required
to obtain the proper setting using
Tool J-4552. See Figure 3-37.
b. Choke Rod Adjustment
Turn idle stop screw into the
normal idle position (normal idle
position would be with the idle
stop screw turned in approxi-
mately 3 turns against the fast
idle cam, with the choke valve
held wide open). Place idle stop
screw on the second step of the
fast idle cam against shoulder of
the high step. Wire gauge marked
.055 should just go between the
upper edge of choke valve and
wall of air horn. Bend tang on
BEND TANG
TO ADJUST
GAUGE BETWEEN
R EDGE OF CHOKE
LVE AND AIR HORN
CASTING
T IDLE SCREW
ON SECOND STEP OF
CAM AGAINST HIGH
STEP
GAUGE BETWEEN
UPPER EDGE OF CHOKE
VALVE AND AIR HORN
CASTING
THROTTLE VALVES
WIDE OPEN
BEND TANG TO ADJUST
Figure 3-38—Choke Rod Adjustment
Figure 3-39—Choke Un loader
Adjustment
choke lever to obtain correct
choke rod setting. See Figure
3-38.
c. Choice Unloader
Adjustment
With throttle valves held wide
open, choke valve should be
opened enough to admit end of
gauge marked .136 between upper
edge of choke valve and inner air
horn wall. Bend unloader tang on
throttle lever to obtain proper
clearance. See Figure 3-39.
d. Slow Idle Adjustment
Adjust slow idle in drive to 550
RPM (add 50 RPM for air con-
ditioner). When engine is at nor-
mal operating temperature, adjust
idle mixture needle screws; re-
adjust idle speed if necessary.
See paragraph 3-8.
e. Fast Idle Adjustment
A fast idle speed adjustment is
not required because fast idle is
controlled by the throttle stop
screw. If the idle speed is cor-
rectly set and the choke rod
properly adjusted, the fast idle
will be maintained.