Pontiac tempest 1968 Service Manual page 319

6B-12
1968 P O N T I A C SERVICE M A N U A L
CHOKE LEVER—-^.^
- - INTERNAL VENT
CHOKE ROD-
^ CHOKE COIL
% r LEVER
HOT IDLE — '
COMPENSATOR
FAST . . i * . 1
IDLE • ? ••••
CAM
S - y • • AIR HORN
X ; SCREW (6)
v CHOKE VACUUM
BREAK DIAPHRAGM
UNIT
- 1 : • •
/
IDLE SPEED
ADJUSTING SCREW
^ I D L E MIXTURE
N
ADJUSTING SCREW
SRARK VACUUM TUBE
F i g . 6B-26 Air Horn Removal
3. Remove six air horn to float bowl attaching
screws (three long and three short screws).
4. Remove air horn by lifting straight up, invert
and place on clean bench. Air horn to bowl gasket
can remain on bowl for removal later.
AIR HORN DISASSEMBLY (Fig. 6B-27)
1. Remove two vacuum break diaphragm cover
screws. Then carefully remove diaphragm cover
retainer.
2. To r e m o v e vacuum break diaphragm and
plunger rod, hold choke valve open. Then push up­
ward on diaphragm rod until the looped end of rod
slides out off of wire lever attached to choke valve.
Then remove diaphragm plunger rod through hole in
air horn.
3. If desired, the choke valve, vacuum break lever
and choke shaft can be removed from air horn by
removing two choke valve screws. Staking on choke
valve screws should be filed off before removing so
as not to ruin threads and distort choke shaft.
4. No further disassembly of the air horn is nec­
essary. The idle vent valve can be removed by
turning screw head out of plastic guide. A repair
kit is available if replacement parts are needed.
NOTE: The cranking enrichment valve is not
removable. Make sure after cleaning that cleaning
solution is completely removed from valve cavity
and bleed hole in valve retainer is open.
FLOAT BOWL DISASSEMBLY (Fig. 6B-28)
1. Remove air horn to float bowl gasket. Gasket
is slit next to metering rod lever so that it can be
slid over lever for ease in removal.
CHOKE
V A L V E ^ ^ .,__ .
^ . VACUUM BREAK LEVER
-IDLE VENT VALVE
^ CHOKE SHAFT
VACUUM ^ -
DIAPHRAGM - " X
PLUNGER ROD
VACUUM BREAK "
DIAPHRAGM
VACUUM BREAK
COVER SCREWS (2)
^_CHOKE ENRICHMENT
PICK-UP TUBE
Fig. 6 B - 2 7 Air Horn Disassembly
2. Remove float from float bowl by lifting upward
on float hinge pin. Remove hinge pin from float arm.
3. Remove float needle, then remove float needle
seat and gasket.
4. Remove fuel inlet nut and gasket, then remove
filter element and pressure relief spring.
5. Using long nosed pliers, remove T pump dis­
charge guide. Pump discharge spring and ball may
be removed by inverting bowl.
6. The idle tube can be removed at same time by
inverting bowl.
7. To remove accelerating pump plunger and
power piston - metering rod assemblies, remove
actuating lever on throttle shaft by removing attach­
ing screw in end of shaft.
8. Hold the power piston down in float bowl, then
remove power piston drive link by sliding out of
hole in power piston plunger rod. The power piston
- metering rod can now be removed from float bowl.
NOTE: The metering rod can be removed from
holder on power piston by pushing downward on end
of rod against spring tension. Then slide narrow
neck of rod out of slot in rod holder.
^ IDLE COMPENSATOR
CHOKE VACUUM HOLE
MAIN WELL
AIR BLEED \
POWER PISTON
IDLE RESTRICTION ^
US
^ IDLE COMPENSATOR
AIR INLET
^ PUMPJET
" v . - PUMP DISCHARGE
RETAINER,SPRING 8 BALL
IDLE TUBE i
METERING JQjL ~"
ROD
- - PUMP PLUNGER
i ASSEMBLY
: $*4 ' FLOAT NEEDLE a
\ 'j,. - SEAT ASSEMBLY
FLOAT j /
ASSEMBLY /
FLOAT
HIMG£
PIN
| ^ F U E L INLET FILTER
-*-FUEL INLET NUT
FLOAT
HIMG£
PIN
Fig. 6B-28 Float Bowl Disassembly