Assembly And Adjustments; Throttle Body - Chevrolet 1973 Overhaul Manual

1. Fuel Inlet Nut
2. G a sk e t
3. Fuel Filter
4. Fuel Filter Sp rin g
5. V a c u u m Break H ose
6. V a cu u m D iap h ragm
7. A ir V alve D a sh p o t
8. C h ok e Control
Bracket
9. Fast Idle Cam
2.. Blow out all passages in castings with compressed
air. Do not pass drills through jets or passages.
3. Inspect idle mixture needle for damage.
4. Examine float needle and seat assembly for wear.
Install a new factory matched set if worn.
5. Inspect upper and lower casting sealing surfaces for
damage.
6. Inspect holes in levers for excessive wear or out of
round condition. If levers or rods are worn they
should be replaced.
7. Examine fast idle cam for excessive wear or
damage.
8. Check throttle and choke levers and valves or binds
and other damage.
9. Replace filter element.
10. Check all springs for distortion or loss in tension,
replace as necessary.
10. S e c o n d a ry Throttle
Lockout
11. Throttle Body-to-Bow l
G a sk et
12. Float Bo w l A sse m b ly
13. Idle Sp e e d S cre w
14. Prim ary Jets
15. Pum p D isc h a rg e Ball
16. Pum p Return S p rin g
17. A ccelerator Pum p
Fig. Q3--Float Bowl Exploded View
18. Pow er Piston S p rin g
19. Prim ary M e te rin g
R o d s
20. Pow er Piston
21. M e te rin g Rod
Retainer
22. Float
23. S e c o n d a ry A ir Baffle
24. Float Bo w l Insert
25. Float H in ge Pin
ASSEMBLY AND ADJUSTM ENTS
New Part Replacement
If a new throttle body is being replaced, install and
bottom the new idle mixture needle and back off four
turns. Do not install plastic limiter cap at this time until
proper screw settings have been made.
After completing assembly of the carburetor, and when
installed in the vehicle, adjust the mixture screw to
achieve the idle speed and idle mixture settings as
outlined under '"Additional External Settings and
Adjustments".
Throttle Body Assembly
1. If removed, install the idle mixture needles and
springs until lightly seated. Back out idle mixture
needles four turns as a preliminary idle adjustment.
NOTE: Do not install the new plastic limiter
caps until the idle mixture has been set with
the carburetor installed on the engine.
CARBURETORS 6 M - 2 3
26. Float N eedle Pull
Clip
27. Float Needle
28. Float Needle S e a t
29. Needle S e a t G a sk e t
30. D isc h a rg e Ball
Retainer
3 1. C h ok e Rod
32. C h ok e Lever
OVERHAUL MANUAL