Pontiac tempest 1968 Service Manual page 327

6B-20
1968 P O N T I A C SERVICE M A N U A L
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Fig. 6B-44 Removing Pump Discharge Spring Retainer
2. Remove fast idle screw from throttle lever if
necessary to replace.
CLEANING AND INSPECTION
Dirt, gum, water or carbon contamination in or on
exterior moving parts of a carburetor are often
responsible for unsatisfactory performance. For
this reason, efficient carburetion depends upon care­
ful cleaning and inspection while servicing.
1. Thoroughly clean carburetor casting and metal
parts in clean cleaning solvent.
CAUTION: Vacuum break unit, gaskets, and pump
plunger should not be immersed in solvent. Clean
pump plunger in clean gasoline only.
2. Blow all passages in castings (Fig. 6B-45)
through 6B-49) dry with compressed air and blow
off all parts until they are dry.
CAUTION: Do not pass drills or wires through
calibrated jets or passages as they may en­
large orifices and seriously affect carburetor
calibration.
3. Check all parts for wear. If wear is noted,
defective parts must be replaced. Note especially
the following:
a. Check float needle and seat for wear. If
wear is noted the assembly must be replaced.
MAIN WELL
AIR BLEEDS
PRIMARY IDLE
AIR BLEEDS
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PUMP
' NOZZLES' '
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MAIN
WELL
TUBES
'IDLE TUBES'
Fig. 6B-45 Venturi Cluster Passage Identification
b. Check float lip for wear and float for damage.
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a
Check throttle and choke shaft bores in
throttle body and cover castings for wear or out
of round.
d. Inspect idle adjusting needle for burrs or
ridges. Such a condition requires replacement.
Fig. 6B-46 Body to Bowl Cover Passage Identification