Jeep J-10 Series 1982 Technical & Service Manual page 384

14-72 FUEL SYSTEMS
Fast Idle Speed Adjustment
Adjust the fast idle speed with the engine at normal
operating temperature and with the EGR valve dis
connected. Position the fast idle adjustment screw in
contact with second 3tep and against the shoulder of the
high step of the fast idle cam. Refer to Specifications for
the correct engine rpm. Adjust by turning the fast idle
adjustment screw.
Bowl Vent Adjustment
This is not a precise adjustment. It is necessary to
ensure that the mechanical bowl vent is open at idle and
closed at greater throttle openings. It may be performed
with the carburetor installed or removed from the
engine.
(1) If installed on engine, turn ignition off. Ensure
fast idle adjustment screw is not in contact with fast idle
cam.
(2) Manually depress stem of bowl vent valve and
insert gauge between valve stem and flat on end of bell
crank. Refer to Specifications for clearance dimension.
(3) If clearance is not correct, bend bellcrank as
required. Do not bend lever on accelerator pump.
CHOKE MECHANISM SERVICE
The choke mechanism may be serviced without re
moving the carburetor from the engine. If the choke or
linkage binds, sticks, or does not operate smoothly, per
form the following.
(1) Disconnect heater wire connector and remove
choke cover.
(2) Remove choke lever screw and lever.
(3) Remove choke housing. Slide out choke shaft.
Remove thin plastic bushing.
(4) Polish shaft with crocus cloth. Wipe bushing
clean and insert into housing.
(5) Wipe fast idle cam clean.
(6) Install choke housing over choke shaft and in
stall housing screws.
(7) Install choke lever and screw.
(8) Install choke cover, connect heater connector
wire and adjust to specification.
SPECIFICATIONS
Model 2150 Carburetor Calibrations (Inches)
2RHM2
2RHA2
Throttle Bore Size 1.562
1.562
Main Venturi Size
1.21
1.21
Fuel Inlet
Diameter
0.101
0.101
Low Speed Jet
(Tube)
0.033
0.036
Economizer 0.052
0.061
Idle Air Bleed
0.086
0.086
Main Jet Number 55 55
High Speed Bleed
0.055
0.055
Power Valve
Timing
(inches of Hg)
—First Stage
—Second Stage
9.0
5.0
9.0
5.0
Accelerator Pump
Jet
0.024 0.024
Vacuum Spark
Port
—Height
-Width
0.050
0.085
0.050
0.085
Choke Heat
Bypass 0.114 0.114
Choke Heat
Inlet Restriction
0.076
0.076
Choke Vacuum
Restriction
0.089 0.089
80600
Model 2150 Carburetor Specifications
List
Number
Application
Float Level
(Wet)
(Inches)
Float
Level
(Dry)
Initial
Choke Valve
Clearance
(Inches)
Fast Idle
Cam Setting
(Inches)
Automatic
Choke Cover
Setting
(Notches Rich)
Choke
Unloader
(Inches)
Fast Idle
Speed ®
Bowl
Vent
Clearance
Choke
Bimotel
ID
Set
To
OK
Range
Set
To
OK
Range
Set
To
OK
Range
Set
To
OK
Range
Set 1 OK
To iRange
2RHM2
360
Manual
49 State
0.93
0.868
to
0.992
Measure
from
machined
surface
to a point
on float
1 /8-inch
from tip.
Needle
Seated.
0.116
0.098
to
0.140
0.076
0.061
to
0.091
1
1/2
to
1-1/2
0.350 min.
1500
1400
to
1600
0.120
KJ
2RHA2
360
Automatic
49 State
0.93
0.868
to
0.992
21/64 in.
± 1/32 In.
0.116
0.098
to
0.140
0.076
0.061
to
0.091
1
1/2
to
1-1/2
0.350 min. 1600
1500
to
1700
0.120
KJ
©Hot with EGR valve disconnected.
80601
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