Jeep J-10 Series 1982 Technical & Service Manual page 371

FUEL SYSTEMS 1J-59
CARBURETOR MODEL 2150-2
VENTURI
Altitude Compensated Model 2150 Carburetor
Carburetor Circuits
Carburetor Overhaul
Carburetor Replacement
Page
14-71
1J-59
1J-62
1J-62
GENERAL
The Motorcraft Model 2150 carburetor (with altitude
compensation) is a two-venturi carburetor that in
corporates two lightweight aluminum assemblies, the
air horn and the main body.
The air horn assembly serves as the main body cover
and also contains the choke assembly and fuel bowl
vents.
The throttle shaft assembly and all components of the
fuel metering circuits are contained in the main body
assembly. The automatic choke assembly and the sole
noid are attached to the main body (fig. 1J-114).
The Model 2150 carburetor with altitude com
pensation uses an additional choke valve to aid cold
weather engine start up.
This carburetor features a compensation circuit that
mixes a metered amount of additional air into the air/
fuel mixture to prevent an over-rich condition at higher
altitudes. An automatic device (aneriod) reacts to at
mospheric pressure and overrides the compensation fea
ture at lower altitudes.
NOTE: With extremely low barometric pressure condi
tions, the aneroid may open the vent valve at sea level.
This is normal and does not indicate a faulty component.
ALTITUDE
COMPENSATION
ANEROID
ADJUSTING
SCREW
MAIN BODY
ALTITUDE
COMPENSATION
CIRCUIT CHOKE
« CHOKE
COVER
CHOKE
DIAPHRAGM
VACUUM
SOURCE
81153
Fig. 1J-114 Model 2150 Carburetor Assembly
Choke Mechanism Service
General
Service Adjustment Procedures
Specifications
Page
1J-71
1J-58
1J-67
1J-72
Identification
Each carburetor is identified by a code number and
build date that is stamped on an identification tag. Each
carburetor build month is coded alphabetically begin
ning with the letter A for January and ending with the
letter M for December (the letter I is not used). The tag
is attached to the carburetor and must remain with it to
assure proper identification (fig. U-115).
CODE
YEAR MONTH DAY
BUILD DATE
REVISION
LETTER
Fig. U-115 Identification Tag
CARBURETOR CIRCUITS
The Model 2150 carburetor utilizes six circuits: Float
(Fuel Inlet), Idle Metering (Low Speed). Main Metering
(High Speed), Pump. Choke and Altitude Compensation.
Float (Fuel Inlet) Circuit
Pressurized fuel enters the fuel bowl through the fuel
inlet fitting in the main body. The Viton-tipped fuel inlet
needle is controlled by the float and lever assembly,
which is hinged on the float shaft. A wire retainer is
hooked over grooves on opposite ends of the float shaft
•and into a groove behind the fuel inlet needle seat. The
retainer holds the float shaft firmly in the fuel bowl
guides and also centers the float assembly in the fuel
bowl. An integral retaining clip is hooked over the end of
the float lever and attached to the fuel inlet needle. This
assures reaction of the fuel inlet needle during down
ward movement of the float (fig. U-116).