Buick LeSabre 1965 Service Manual page 124

3 - 4 8 4-BARREL ROCHESTER
ENGINE FUEL AND EXHAUST
Figure 3-56—Checking Secondary
Lock-Out Adjustment
5. Secondary Lock-Out Adjust-
ment. Close choke valve so that
secondary throttle lock-out tang
is on lock-out step of fast idle
cam. Check clearance b e t w e e n
tang and step using .015" gauge.
See Figure 3-56.
6. If clearance between tang and
lock-out step is not correct, bend
tang as required to obtain this
c l e a r a n c e using Tool J-6058A.
See Figure 3-57.
7. Secondary Contour Adjustment.
Fully open choke valve 30 that
fast idle cam falls to its lowest
position. Then open throttle so
that secondary lock-out tang fol-
lows contour portion of fast idle
cam. With choke held wide open,
check clearance between lock-out
tang and contour portion of cam
using .030" g a u g e . See Fig-
ure 3-58.
8. If clearance between tang and
Figure 3-58—Checking Secondary
Contour Adjustment
contour is not correct, bend tang
as required to obtain this clear-
ance using Tool J-6058A. See
Figure 3-59.
9. If adjustment w a s necessary
to correct lock-out tang to con-
tour c l e a r a n c e , the tang to
lock-out slot clearance should be
rechecked (Steps 5 & 6) to be sure
it was not disturbed.
10. Pump P l u n g e r Adjustment.
Push fast idle cam to full down
position and back out throttle stop
screw u n t i l primary throttle
valves can be fully closed. With
throttle held closed and pump rod
in center hole of lever, measure
vertically from under side of
pump plunger offset to air horn
casting. See Figure 3-60. Meas-
urement should be 1-1/64".
11. Turn throttle stop screw in
(from fully closed throttle posi-
Figure 3-60—Checking Pump
Plunger Adjustment
CHOKE VALVE
HELD CLOSED
CHOKE PISTON
PROJECTS 1/32"
PUSH
O N CHOKE PISTON
Figure 3-61—Checking Choke
Piston Adjustment
tion) one turn which will provide
an initial slow idle speed adjust-
ment. Install intermediate choke
rod and spring clip.
12. Choke P i s t o n Adjustment.
With choke valve h e l d tightly
Figure 3-57—Adjusting Secondary
Lock-Out
Figure 3-59—Adjusting
Secondary Contour
Figure 3-62—Adjusting Choke Piston