Float Level Adjustment; Vacuum Piston Gap Adjustment; Vacuum Piston Adjustment; Accelerator Pump Adjustment - Jeep 1979 CJ-5 Technical & Service Manual

FUEL SYSTEMS 1J-17
ADJUSTING
SCREW
V A C U U M
PISTON
M E T E R I N G RODS
6 0 4 4 3
Fig. 1J-3Q Vacuum Piston and i i l i r l i | 111 Assembly
(21) Install link and retainer between choke lever
and choke housing lever.
(22) Install link and retainer to fast idle cam and
choke lever.
(23) Adjust initial choke valve clearance. Refer to
Service Adjustment Procedures.
(24) Adjust fast idle cam clearance. Refer to Service
Adjustment Procedures.
(25) Adjust choke unloader clearance. Refer to Serv-
ice Adjustment Procedures.
(26) Loosen choke cover screw and set cover index to
specification. Tighten all cover screws.
SERVICE ADJUSTMENT PROCEDURES
Float Level Adjustment
(1) Remove air horn.
(2) Hold float gently against needle to raise float
(fig. 1J-31).
(3) Place straightedge across float bowl to measure
float level. Refer to Specifications.
(4) If adjustment is necessary, release floats and
bend float lever.
CAUTION: Never bend float lever while it is resting
against needle. Pressure may damage synthetic tip and
cause a false setting.
(5) Install air horn.
F L O A T
G A S K E T
60497
Fig. 1 J 3 1 Float Level Adjustment
Vacuum Piston Gap Adjustment
The vacuum piston gap is a critical adjustment (fig.
1J-32). Turning the adjusting screw clockwise makes the
fuel mixture richer. Turning the adjusting screw
counterclockwise makes the fuel mixture leaner. Turn
adjusting screw to set gap. Refer to Specifications.
Vacuum Piston Adjustment
(1) Adjust gap in vacuum piston to specifications as
described above.
(2) Back off curb idle adjustment until throttle
valves are completely closed. Count number of turns so
screw can be returned to original position. Turn idle
screw until it just contacts stop, then turn in one full
turn.
(3) Fully depress vacuum piston while holding mod-
erate pressure on rod lifter tab. While in this position,
tighten rod lifter lock screw (fig. 1J-32).
(4) Release piston and rod lifter.
(5) Adjust accelerator pump as outlined below.
(6) Return curb idle screw to its original position.
(7) Install dust cover.
Accelerator Pump Adjustment
(1) Remove dust cover.
(2) Back off curb idle speed adjusting screw to com-
pletely close throttle valve. Open choke valve so fast idle
cam allows throttle valves to seat in bores.
(3) Turn curb idle adjusting screw in until it just
contacts stop. Then continue two complete turns.
(4) Measure distance between surface of air horn
and top of accelerator pump shaft (fig. 1J-33). Refer to
Specifications for correct dimension.
(5) Loosen pump arm adjusting lock screw and ro-
tate sleeve to adjust pump travel to proper measure-
ment. Tighten lock screw.
(6) Install cover and screws.