Carburetor - 2-bbl (wagon) Toyota Tercel L30

DESCRIPTION

Carburetor is a 2-barrel, downdraft design, equipped with an automatic choke consisting of a bi-metallic coil and an electrically-operated ceramic heater.

CARBURETOR IDENTIFICATION

ADJUSTMENTS

Note. For all on-vehicle adjustments not covered in this article, see TUNE-UP article in the TUNE-UP section.

Note. Manufacturer recommends for carburetor adjustments and measurements to use Carburetor Service Kit (09240-00014 and 09240-00020).

FLOAT LEVEL ADJUSTMENT

Note. Remove needle valve wire clip and install new inlet seat gasket before adjusting float.

Remove air horn gasket, invert air horn and allow float to hang by its own weight. Measure clearance between top of float and air horn. (Scheme 152) Clearance should be.283" (7.2 mm). Adjust clearance by bending float arm at tab "A". (Scheme 153)

Float Level Measurement. Scheme 152

Float Level Adjustment. Scheme 153

FLOAT DROP ADJUSTMENT

1. Invert air horn. Lift up float and measure clearance between needle valve and float arm. (Scheme 154) Clearance should be.066-.078" (1.67-1.99 mm).
2. Adjust clearance by bending outer float tab "B". (Scheme 155) Install needle valve clip after completing float adjustments.

Float Drop Measurement. Scheme 154

Float Drop Adjustment. Scheme 155

PRIMARY & SECONDARY THROTTLE VALVES ADJUSTMENT

Invert carburetor, insert angle gauge and separately measure angle of primary and secondary throttle valves at full throttle. Primary throttle valve angle should be 90 degrees from horizontal plane for all models. Secondary throttle valve angle should be 75 degrees. Adjust by bending throttle lever stop.

Bench Adjustment

Position throttle shaft lever to high (first) step of fast idle cam. Close choke valve and measure primary throttle valve angle. Angle should be 20 degrees. Adjust by turning fast idle adjustment screw.

CHOKE UNLOADER

Fully open primary throttle valve, insert angle gauge and measure choke valve angle. Angle should be 41 degrees. Bend fast idle lever to adjust. (Scheme 156)

Choke Unloader Adjustment. Scheme 156

CHOKE OPENER

1. Set fast idle cam, open throttle slightly and gently push choke valve closed. Keep choke valve closed and release throttle valve.
2. Apply vacuum to choke opener diaphragm and measure choke valve angle. Angle should be 77 degrees. Adjust by bending tang on relief lever, connecting choke opener link to choke valve shaft.

Scheme 157

1. Fully close choke valve. Apply vacuum to choke breaker inner diaphragm "A". Measure choke valve angle. Angle should be 38 degrees. (Scheme 157) (Scheme 157): Choke Breaker Adjustment
2. Adjust by bending tang on relief lever, connecting breaker diaphragm link to choke valve shaft.
3. Apply vacuum to both choke breaker diaphragms "A" and "B". Measure choke valve angle. Angle should be 55 degrees. Adjust by turning diaphragm adjustment screw.

SECONDARY KICK-UP

Check primary throttle valve opening angle at same time primary kick lever just touches secondary kick lever. Standard angle is 52 degrees from horizontal. Adjust by bending secondary throttle lever. (Scheme 158)

Secondary Kick-Up Adjustment. Scheme 158

SECONDARY TOUCH ANGLE

Check primary throttle valve opening angle as primary kick lever touches secondary kick lever. Angle should be 45 degrees. Adjust by bending primary kick lever. (Scheme 159)

Secondary Touch Angle Adjustment. Scheme 159

ACCELERATOR PUMP STROKE ADJUSTMENT

Place a straightedge on top of air horn. Fully open choke valve and measure full travel of pump plunger. Plunger travel should be.157" (4.0 mm). Adjust pump stroke by bending linkage rod at existing bend. (Scheme 160)

Accelerator Pump Stroke Adjustment. Scheme 160

OVERHAUL

Note. Manufacturer recommends using Carburetor Driver Kit (09860-11011) to service carburetor.

Air Horn

1. Disconnect choke link and accelerator pump connecting rod. Remove pump arm pivot screw and pump arm. Disconnect choke breaker vacuum hose. Remove fuel line and union and 8 air horn screws.
2. Disconnect choke opener link and remove air horn with gasket from body. Disconnect wiring and remove primary and secondary solenoid valves from body.
3. Remove float pivot pin, float and needle valve assembly. Remove air horn gasket, needle valve seat and gasket, power piston retainer, power piston and spring. Remove pump plunger and boot. (Scheme 162)

Exploded View of Carburetor Main Body. Scheme 161

Exploded View of Air Horn Assembly. Scheme 162

Main Body

1. Disconnect throttle positioner links and remove bracket attaching bolts. Remove accelerator pump retainer gasket and remove pump discharge weight, long spring and discharge large ball. (Scheme 161)
2. Remove pump dampening spring. Using tweezers, remove retainer and check ball. Remove slow jet, power valve with jet and throttle positioner levers. Remove primary and secondary main passage plugs, primary main jets and gaskets.
3. Remove Auxiliary Acceleration Pump (AAP) housing, diaphragm and spring. Remove AAP inlet plug and check ball. Remove outlet plug, short spring and small ball. Remove primary and secondary small venturies.
4. Remove sight glass retainer, sight glass and "O" ring. Remove throttle lever return spring and back spring. Remove throttle lever and fast idle cam.
5. Disconnect link and remove secondary throttle valve diaphragm assembly and gasket. Remove 3 body-to-flange bolts and vacuum passage bolt. Separate body from flange. (Scheme 163)

Exploded View of Carburetor Flange. Scheme 163

CLEANING

Note. Do not immerse synthetic parts, electrical components or diaphragm assemblies in carburetor cleaner.

Remove carbon from around throttle valve and clean cast parts with carburetor cleaner. Clean jets, fuel passages and vacuum ports with compressed air. Do not use wire or similar metal objects. Clean all other parts with solvent and soft brush.

Choke Heater

Measure resistance between inner half of thermostat housing and wire connector. Resistance at 68°F (20°C) should be 17-19 ohms. Replace air horn if resistance is not within specification.

Fuel-Cut Solenoid Valves

1. Ensure solenoid valve clicks as solenoid is connected and disconnected from battery. Test primary solenoid by connecting both lead wires to positive battery terminals.
2. Test secondary solenoid by connecting solenoid lead wire to battery positive terminal and jumping solenoid body to negative battery terminal. Replace solenoid if it fails to operate properly.

REASSEMBLY

1. To reassemble, reverse disassembly procedure. When assembling flange parts, ensure vacuum passage bolt is installed in correct position. Ensure springs are installed in proper location and check balls are located in appropriate orifices.
2. When installing pump discharge weight and outlet valve assembly, ensure all components are installed in correct order. After installing power piston, check piston for smooth operation.
3. If choke valve has been separated from shaft, peen new retaining screws after valve is installed on shaft. Tighten air horn screws gradually and alternately to prevent distortion.

SPECIFICATIONS

CARBURETOR ADJUSTMENT SPECIFICATIONS