CARBURETOR (COROLLA) REMOVAL 1) Drain cooling system. Disconnect air intake hose. Disconnect emission control hoses from air cleaner. Remove air cleaner mounting bolt and wing nut. Remove air cleaner. 2) Disconnect accelerator cable. Disconnect throttle cable (A/T). Disconnect carburetor wiring connector. Disconnect emission control hoses and tag for installation. Disconnect fuel inlet hose. Remove 4 carburetor mounting nuts and No. 1 vacuum pipe. Remove carburetor. DISASSEMBLY Air Horn 1) Remove air cleaner setting bolt. Remove fuel pipe clamp, union, fuel pipe and gaskets. Remove vacuum hoses. Remove pump and pivot screw and pump arm with connecting link. Disconnect choke link and choke opener link. 2 Remove 8 air horn screws and number plate, fuel pipe support and wire clamps. Remove air horn from carburetor body. Disconnect wiring from solenoid valves. 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. See Fig. 2.
Fig. 1: Exploded View of Aisan Carburetor Main Body (Corolla) Courtesy of Toyota Motor Sales, U.S.A., Inc. Fig. 2: Exploded View of Air Horn Assembly (Corolla) Courtesy of Toyota Motor Sales, U.S.A., Inc. Main Body 1) Remove solenoid valves from carburetor body. Remove stopper gasket. 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. See Fig. 1. 2) Remove pump dampening spring. Using tweezers, remove plunger retainer and check ball. Disconnect throttle positioner link and throttle position levers, washer and spring. Remove primary and secondary main passage plugs and gaskets. Remove primary and secondary main jets and gaskets. 3) Remove auxiliary acceleration pump (AAP) housing, spring and diaphragm. 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 throttle position switch and bracket. Remove 3 body-to-flange screws and vacuum passage screw. Separate body from flange. See Fig. 3. Remove washer from throttle valve shaft. Remove idle mixture adjusting screw and idle speed adjusting screw.