Carburetor - Motorcraft 2150 2-bbl Ford Cab & Chassis Ranger

COMPONENT TESTING

Note. Specific component testing information not available. Refer to any tests performed during REMOVAL & INSTALLATION or OVERHAUL procedures

APPLICATION

FORD (MOTORCRAFT) CARBURETOR NO.

FORD

A carburetor identification tag is attached to carburetor. The tag contains part number prefix and suffix. Basic part number for all carburetors is 9510.

A design change code (if any) is also stamped on the tag. An assembly date code (year, month and day) is also stamped on the tag. (Scheme 1)

Ford Carburetor Identification Tag. Scheme 1

DESCRIPTION

The Motorcraft 2150 carburetor has 2 main assemblies: the air horn and main body.

The air horn contains choke plate, fuel bowl vent, and hot idle compensator. The main body houses throttle plate, accelerator pump assembly, float assembly, power valve, fuel bowl and duty cycle solenoid on feedback models.

Each bore contains main and boost venturi, main fuel discharge, accelerator pump discharge, idle fuel discharge and throttle plate.

On some applications, booster venturi contain variable high speed bleed control system. This system allows control of air/fuel mixture for improved high speed operation and low speed responses. Feedback models use a duty cycle solenoid/altitude compensator to control air/fuel mixture. The duty cycle solenoid is operated by an Electronic Control Assembly.

Vehicles sold for high altitude use (above 4000 ft. or 1219 m) contain an altitude compensator. This circuit compensates for thinner air by metering an additional amount of air into the air/fuel mixture, preventing an over-rich situation. An aneroid (automatic device) reacts to atmospheric pressure and overrides the compensation feature at lower altitudes.

ADJUSTMENT

Note. For all on-vehicle adjustments, see TUNE-UP SERVICE PROCEDURES.

FLOAT LEVEL (DRY SETTING)

Note. Dry float setting is a preliminary adjustment only. Final adjustment (wet setting) must be made after carburetor is installed on vehicle.

Remove float bowl. Hold upside-down. Float is adjusted correctly if top of float is specified distance from top of float bowl. (Scheme 2)

Float Level Adjustment (Dry Setting) This is a preliminary setting; final adjustment must be made with carburetor installed on engine. Scheme 2

ACCELERATOR PUMP STROKE

Note. Accelerator pump stroke has been preset at factory. Setting should not be changed. If original setting has been changed, adjust as follows.

Support accelerator pump cover and drive out pump lever roll pin. Rotate pump lever and rod until key on rod lines up with keyway on over-travel lever. Remove rod and reposition in proper hole of over-travel lever. Reinstall pump lever and roll pin. (Scheme 3)

Accelerator Pump Stroke Adjustment Ensure connecting rod is installed in correct hole of overtravel lever. Scheme 3

CHOKE PULL-DOWN

Note. Most applications have a tamper-proof choke, incorporating a sealed pull-down motor and break-away choke cap screws. Adjustments given are used when a major overhaul is performed or if components are damaged.

1. Loosen choke cover retainers. Open throttle and rotate choke cover until choke valve is held closed. Tighten choke cover.
2. Using an external vacuum source, apply vacuum to hold choke diaphragm against set screw. DO NOT apply pressure to linkage. NOTE: If vacuum is applied to choke diaphragm with a hand vacuum pump, and a air leak is detected, replace vacuum pulldown unit.
3. Using a specified drill or pin gauge, measure clearance between lower edge of choke valve and air horn.
4. If adjustment is required, file a 1/8" (3 mm) deep recessed groove 1/4" (6 mm) behind edge of adjusting screw end of diaphragm.
5. Using an awl angled toward plug, drive plug out. Turn adjusting screw until specified clearance is obtained. (Scheme 4)
6. After adjustment, reinstall plug and seal with epoxy. If adjustment was changed, check fast idle cam position.

Adjusting Choke Pull-Down Clearance If adjustment is changed, fast idle cam position must be checked. Scheme 4

FAST IDLE CAM POSITION

Note. Check choke vacuum pull-down adjustment before adjusting fast idle cam position.

1. Perform steps 1 and 2 of Choke Pull-Down adjustment.
2. Open and close throttle. Fast idle cam should drop to 2nd (kickdown) step. Fast idle screw should be opposite "V" notch on cam. (Scheme 5) NOTE: On models equipped with an idle speed control motor, the fast idle screw does not actually touch fast idle cam. However, the screw should still line up with the "V" notch on the cam.
3. To adjust, turn fast idle lever screw to align fast idle speed screw with "V" notch. Screw is located in plastic fast idle cam lever. Reset choke.
4. To adjust, turn fast idle lever screw. Reset choke to proper adjustment notch.

Ford Fast Idle Cam Position Adjustment Perform vacuum pull-down adjustment before adjusting fast idle cam position. Scheme 5

CHOKE UNLOADER

1. Hold throttle fully open, and lightly press choke valve toward closed position. Using a specified drill or pin gauge, measure specified choke unloader clearance between lower edge of choke valve and air horn wall.
2. To adjust, bend choke unloader tang that contacts fast idle cam. Bend tang toward cam to increase clearance and away from cam to decrease clearance. DO NOT bend unloader tang downward from a horizontal plane. (Scheme 6)
3. After correct adjustment is obtained on Jeep models, open throttle until unloader tang is directly under fast idle cam pivot. Make sure there is.070" (1.78 mm) clearance, between unloader tang and fast idle cam.
4. Operate throttle after adjustment. Make sure that tang does not stick or bind against any portion of the linkage or carburetor casting.

Choke Unloader Adjustment Do not bend unloader tang downward from a horizontal plane. Scheme 6

AUTOMATIC CHOKE

Loosen choke thermostat cover retaining screws. Rotate cover assembly in "Rich" or "Lean" direction to align reference marks. Tighten cover screws.

Air Horn

1. Remove air cleaner anchor screw and automatic choke control rod retainer. Remove air horn attaching screws, lock washers, carburetor identification tag and air horn. Remove screw securing choke lever to choke shaft. Remove choke rod and seal from air horn.
2. Remove choke diaphragm assembly. If necessary to remove choke valve, file staking from retaining screws. Remove screws. Slide choke valve out from top of air horn. Remove choke shaft.
3. On models equipped with altitude compensator, remove by-pass choke plate in same way as main choke plate. To remove shaft, remove link retainer and slide shaft out of air horn.

1. Remove fast idle cam retainer and thermostatic choke coil housing screws. Remove clamp and gasket. NOTE: Some models are equipped with break-away screws retaining coil cover to prevent tampering with factory adjustment. To remove break-away screws, align a 1/4" (6 mm) drill on head, and drill only enough to remove head. Using an 1/8" (3 mm) punch, drive remaining portion of screw from housing. Repeat for remaining break-away screws.
2. Remove choke housing screws, choke housing, gasket and fast idle cam rod from cam lever. Remove choke lever retaining screw and washer. Remove choke lever and fast idle cam lever.

Main Body

1. Using a screwdriver, pry float shaft retainer from fuel inlet seat. Remove float, float shaft retainer and fuel inlet needle assembly. Remove retainer, float shaft and float damper spring (if equipped) from float lever.
2. Remove fuel inlet needle, seat and filter screen. Using a jet wrench, remove main jets. Remove booster venturi screw, booster venturi, metering rod assembly and gasket. Remove filter screen from booster venturi screw.
3. Invert main body and catch accelerator pump discharge weight and check ball. To disassemble lift rod from booster, remove lift spring retaining clip and spring. Separate lift rod assembly from booster. DO NOT disassemble metering rod hanger from lift rod.
4. Remove accelerator pump operating rod from overtravel lever and retainer, by pressing ends of retainer together. At the same time, press rod away from retainer until it is free.
5. Remove accelerator pump cover screws. Remove bowl vent rod and bracket, accelerator pump cover diaphragm, and spring. If necessary to remove pump inlet check valve, grasp firmly from outside main body and pull out. NOTE: If tip of check valve breaks off during removal, make sure it is removed from fuel bowl. Pump inlet check valve must be replaced, whenever it is removed.
6. Invert main body and remove enrichment valve cover and gasket. Using a box wrench, remove enrichment valve. Remove and discard enrichment valve gasket.
7. Remove mixture needle limiter caps, mixture needles and springs. If necessary, remove nut and washer securing fast idle adjusting lever, and remove lever. Remove throttle positioner solenoid (if equipped). NOTE: To remove tamper-resistant mixture needle limiter caps, support area under limiter plug and tap cap forward.
8. If necessary to remove throttle plates, mark each plate for reassembly reference. Remove throttle position sensor if equipped. Slide throttle shaft from main body. Mechanical high speed bleed actuator (located between throttle plates in main body) will drop out.
9. On models equipped with feedback solenoid/altitude compensator, remove 3 attaching screws. Remove solenoid/aneroid, gasket and valve assembly.

CLEANING & INSPECTION

1. Use a regular carburetor cleaning solution. Soak components long enough to thoroughly clean all surfaces and passages of foreign matter.
2. DO NOT soak any components containing rubber, leather or plastic.
3. Remove any residue after cleaning by rinsing components in a suitable solvent.
4. Blow out all passages with dry compressed air.

REASSEMBLY

Use new gaskets and seals. Make sure that new gaskets fit correctly and that all holes and slots are punched through and are correctly located. Replace Elastomer valve if removed from main body. To reassemble carburetor, reverse disassembly procedure, noting the following

1. When installing pump inlet check valve (if it was removed), lubricate tip of new valve, and insert tip into center hole of accelerator pump cavity. Insert needle nose pliers in fuel bowl, and pull valve in, until fully seated. Cut off excess valve tip at retaining shoulder, and remove tip from fuel bowl.
2. When installing idle mixture needles and springs, turn screws in with fingers until lightly seated. Back screws off seated position 1 1/2 turns for an initial adjustment. DO NOT install idle screw limiter caps, until final adjustments have been made.
3. If choke coil cover was removed, reinstall using 3 break-away screws. Position gasket, choke cap and retainer. Mount with break-away screws.

Exploded View of Motorcraft Model 2150 2-Barrel Carburetor Duty cycle solenoid is used in place of altitude compensator on feedback models. Scheme 7

Exploded View of Motorcraft Model 2150A 2-Barrel Carburetor Duty cycle solenoid is used in place of altitude compensator on feedback models. Scheme 8

SPECIFICATIONS

CARBURETOR ADJUSTMENT SPECIFICATIONS