Check Valve Ball Location; Accelerator Pump Test - Jeep J-10 Series 1982 Technical & Service Manual

1J-54 FUEL SYSTEMS
(8) Install float assembly with fulcrum pin and pin
retainer in main body. Install needle, seat and gasket
and tighten securely. Adjust float level. Refer to Service
Adjustment Procedures. Install baffle plate.
(9) Place accelerator pump drive spring on pump
plunger shaft and insert shaft into air horn. Compress
spring and insert S-link.
If commercial solvent is used, rinse the cleaned parts
in hot water to remove all traces of solvent, then blow
dry with compressed air. Wipe the parts that cannot be
immersed in solvent with a clean, soft, dry cloth. Ensure
all residue, gum, carbon and other foreign matter are
removed from all parts.
Force compressed air through all passages of the
carburetor.
STEPPER
MOTOR
METERING
PIN
DISCHARGE
BALL
5/32 INCH 60441
Fig. 1J-105 Check Valve Ball Location
Examine the choke shaft for excessive looseness or
binding condition. Inspect the choke valve for nicked
edges and for ease of operation. Inspect the throttle
shaft for excessive looseness or binding in its bore. In
spect throttle valves for burrs or nicks that might pre
vent proper closing. Inspect the main body, throttle
body, air horn, venturi assemblies, choke housing and
choke cover for cracks.
Replace the float if the arm needle contact surface is
grooved. If the float is serviceable, polish the needle
contact surface of the arm with crocus cloth or an equiv
alent material. Replace float shaft if worn. Replace all
damaged screws and nuts and all distorted or broken
springs. Inspect all gasket mating surfaces for nicks or
burrs. Replace any parts that have damaged gasket
surfaces.
Assembly
NOTE: Ensure all holes in the replacement gaskets
have been correctly punched and that no foreign mate
rial has adhered to the gaskets.
(1) If removed, install idle mixture screws and
springs in body. Turn screws lightly against their seats,
then back off number of turns recorded during dis
assembly. Install dowel pins in throttle body.
(2) Invert main body, place throttle body on main
body, and align. Install screws and tighten securely.
(3) Install accelerator pump discharge check valve
ball 5/32-inch (3.96 mm) diameter in discharge passage.
(4) Test operation of accelerator pump. Pour clean
no-lead fuel into carburetor bowl 1/2 inch (12.7 mm)
deep. Insert pump piston into pump cylinder, move pis
ton up and down gently to expel air from pump passage.
With suitable clean brass rod, hold discharge check
valve ball firmly against its seat. Raise piston and press
down. No fuel should be emitted from either intake or
discharge passages (fig. 1J-106).
(5) Clean passage and ball seat if leakage is evident.
If leakage persists, replace main body.
(6) Install replacement gaskets on venturi cluster,
install cluster screws and tighten securely.
(7) Install main metering jets.
(8) Install floats with fulcrum pin and pin retainer
in main body. Install needle, seat and gasket and tighten
securely. Adjust float level. Refer to Service Adjustment
Procedures. Install baffle plate.
(9) Place accelerator pump drive spring on pump
plunger shaft and insert shaft into air horn. Compress
spring and insert S-link.
(10) Place vacuum piston spring in vacuum piston
bore. Position replacement gasket on main body and
install air horn. Install solenoid. Tighten retaining
screws alternately one turn at a time to compress gasket
evenly.
(11) Measure vacuum piston gap. Refer to Service
Adjustment Procedures and figure 1J-107. Carefully in
stall step-up piston and metering rod assembly into its
bore in air horn. Ensure metering rods are in main
metering jets. Ensure metering rod springs are installed
properly (fig. 1J-107).
ACCELERATOR
PUMP 60442
Fig. 1J-106 Accelerator Pump Test