GMC 1989 Light Duty Truck, Руководство по ремонту, Страница: 616 / 998

6C2-18 MODEL M4MEF CARBURETOR
Figure 37 - A ir Horn Screw Location and Tightening
Sequence
A ir Horn
Install or Connect
(Figure 3 7 )
1 .
A ir h o rn assem bly (10).
• H old a ir h o rn g a ske t (201) d o w n a t p u m p
lo c a tio n , g u id e p u m p s te m t h r o u g h a ir
h orn.
• Be sure t h a t tu b e s are p o s itio n e d p ro p e rly
th ro u g h th e holes in th e a ir h o rn gasket.
A ir h o rn screws, in sequence s h o w n :
• T w o c o u n te rs u n k screws (47) (lo c a tio n s #1
& 2), lo c a te d n e x t to th e v e n tu ri area.
• A ir h o rn t o f l o a t b o w l s c re w a ssem blies
(46).
•
A ir h o rn b a ffle (5 0 ), i f u se d , u n d e r
screw assem blies in lo c a tio n s # 3 and 4.
• A ir h o rn t o t h r o ttle b o d y screw assemblies
(45).
Pump Lever and Link
Install or Connect (Figures 3 8 ,5 1 )
1
.
2.
Tool R equired:
J 25322 o r BT-7523 - Pum p Lever Pin Punch
Pump lin k (410), in t h r o ttle lever.
• End o f l i n k w i t h s q u i r t ( b u m p ) fa c e s
o u tw a rd in th e lever.
Pum p leve r (41).
A. Pum p lin k in sp e c ifie d h ole.
• S p e c ific a tio n is in fig u r e 51.
B. Use J 25322 o r BT-7523, o r sm all punch, to
a lig n h o le in le v e r w it h h o le in a ir h o rn
casting.
C. Use s c re w d riv e r to push p u m p lever h in g e
pin (42) in u n til flu sh w ith casting boss.
Choke Lever and Link
Install or Connect (Figure 14)
1. C hoke lin k (356) in to in te rm e d ia te c h o k e le v e r
(354).
• H old fa s t id le cam (3 5 2 ) d o w n to r o ta te
le v e r u p fo r easier in s ta lla tio n .
2. C hoke le v e r (35).
• C o n n e ct le v e r to ch oke lin k , and in s ta ll on
end o f c h o k e shaft.
3. C hoke le v e r a tta c h in g screw (36).
Secondary M e te rin g Rods
Install or Connect (Figure 13)
1. S econdary m e te rin g rods (32), a nd h o ld e r (31).
•
Ends o f rods face each o th e r.
2. H o ld e r a tta c h in g screw (30).
• W o rk a ir valves up and d o w n several tim e s , to be
sure th e y m o ve fre e ly b o th w ays.
VACUUM BREAK ASSEMBLY
Install or Connect (Figures 9 ,1 0 )
1. P rim a ry side vacuum b re a k - a ir va lve le v e r lin k
(58) to a ir va lve lever.
2. P rim a ry side vacuum b re ak assem bly (55).
• C on ne ct p lu n g e r to a ir va lve le v e r lin k .
3. V acuum b re a k a tta c h in g screws (56).