Chevrolet 1977 10 Series, Repair Manual, Page: 208 / 468

6C-14
OVERHAUL MANUAL
Fig. 6 C -3 6 ~ R e m o v in g U p p e r C h o ke Lever
CAUTION:
Do not remove power piston by using
pliers on metering rod hanger.
Remove the power piston spring from the well.
CAUTION:
The A.P.T. metering rod adjustment
screw is pre-set at the factory and no attempt should
be made to change this adjustment in the field. I f
float bowl replacement is required during service,
the new bowl assembly will be supplied with an
A .P .T metering rod screw which will be pre-set as
required.
5. Remove metering rods from power piston by
disconnecting tension spring from top of each rod, then rotate
rod to remove from hanger (Fig. 6C-44).
CAUTION:
Use care when disassembling rods to
prevent distortion o f tension spring and/or
metering rods. Note carefully position o f tension
spring for later reassembly.
6. Remove plastic filler block over float valve.
7. Remove float assembly and float needle by pulling up
on retaining pin. Remove float needle seat and gasket. (Fig.
6C-45).
Fig. 6 C -3 8 -R e m o v in g Pum p Lever
8. Remove aneroid cavity insert from float bowl. (Fig.
6C-46).
9. Remove prim ary main metering jets (only if
necessary) (Fig. 6C-47).
NOTE:
N o attem pt should be made to remove the
secondary metering jet (metering orifice plates). These
jets are fixed and, if damaged, bowl replacement is
required.
10. Remove pum p discharge check ball retainer and
check ball.
11. Remove secondary air baffle, if replacement is
required.
12. Remove pum p well fill slot baffle.
M 4 M E M odel W ith Rear Vacuum Break
11. Remove hose from rear vacuum break control
assembly. Remove two screws from rear vacuum break
bracket and rotate the assembly to remove vacuum break rod
from slot in plunger head (Fig. 6C-48).
CAUTION:
Do not place vacuum break assembly
in carburetor cleaner.
Fig. 6C-37--Removing Secondary M etering Rods
Fig. 6C -39-R em oving A ir Horn Screws