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On the off chance that you do not have the Ford tractor service manual handy, I have copied the relevant text from Ford Tractor Service Manual SE-8175 46117, pages 101, 102, and 103 for you. You may view an "exploded" view of the carburetor from the same manual by clicking here. Service procedures as follows: Carburetor Removal Turn the fuel tank shut-off valve to the "OFF" position. Loosen the air intake tube clamps at the carburetor and pull the hose off of the carburetor. Disconnect the fuel line at the sediment bowl. Disconnect the governor and throttle rod linkage at the carburetor. Remove the two nuts and lock washers that attach the carburetor at the manifold. Remove the carburetor and clean the gasket mounting surfaces. Clean the outside of the carburetor with cleaning solvent to permit an external examination for damages and defects.
Carburetor Disassembly
Loosen the bail wire and remove the sediment bowl. Remove the fuel filter screen from the top of the sediment bowl cover. Remove the main adjustment needle assembly. Remove the carburetor bowl, screws, and lock washers. Separate the cover from the bowl. Remove the float, bowl gasket, venturi, and float valve from the cover. Remove the float valve seat and gasket with a screwdriver that is wide enough to engage both slots in the valve seat. Remove the idle jet. Remove the idle fuel adjustment needle and spring. Mark the throttle plate so it can be reassembled in the same position, then remove the throttle plate screws, throttle plate and throttle shaft and lever assembly. Remove the throttle shaft packing and retainer with a small punch. Remove the main discharge nozzle and gasket. Remove the drain plug from the bottom of the fuel bowl. Remove the choke plate screws, choke plate, and the shaft and lever assembly. Remove the choke shaft packing retainer and the packing.
Carburetor Inspection and Cleaning
Clean all parts with a good solvent. Be sure all channels and orifices are clean. Discard jets showing signs of wear or corrosion. Never use a wire or small drill to clean out orifices. Even a small change in the size of the hole will affect carburetor performance. Discard the float valve and seat if they are grooved or corroded. Always use an entire float valve and seat assembly, as they are serviced in matched sets. Discard the idle fuel adjustment needle if it is grooved or corroded. Inspect the throttle shaft and lever assembly for wear. If the shaft is loose in the bore, a new assembly should be used. Inspect the carburetor fuel bowl and bowl cover for cracks or distortion. Check the float for leaks, cracks, or distortion.
Carburetor Assembly
Install the retainer and a new packing in the fuel bowl. Tap the retainer lightly until it is flush with the casting. Install the throttle shaft in the bowl making sure the idle speed adjustment screw is to the rear of the stop. Place the throttle plate in operating position and install the screws and lock washers. The angle number of the plate should face toward the rear of the carburetor. Install the idle jet. Install the idle fuel adjustment needle and spring. Turn the needle in until it just contacts the seat, then back it off one turn for
the initial adjustment. Install a new gasket and the float valve seat using a screwdriver that is wide enough to contact both slots in the seat. Install the
float valve and fuel bowl gasket, then install the float and lever assembly (install the float support spring and support if the carburetor is so equipped). Adjust the float so that it measures 0.26 - 0.29" from the gasket to the nearest edge of the float. The float is adjusted by bending the hinge. Use caution when bending the hinge to avoid damaging the mounting bracket. Install the retainer and packing in the carburetor bowl. Slip the shaft through the bore, then install the choke plate and retaining
screws. Be sure the choke return spring is properly hooked over the lever and on the stop provided on the side of the carburetor. Position a new gasket on the main nozzle and install the nozzle in the carburetor body. Invert the throttle body and install the fuel bowl. Install the retaining screws and tighten them to 36 in. lbs. torque. Use new gaskets and install the sediment bowl cover on the carburetor. Replace the fuel filter in the top of the sediment bowl. Use a new gasket and secure the sediment bowl in place with the bail wire and nut. Tighten the bail securely. Install the drain plug in the bottom of the carburetor.
Carburetor Installation
Use a new carburetor mounting gasket and hold the carburetor in place on the manifold. Install the two lock washers and nuts and tighten them to 12 - 16 ft. lbs. torque. Connect the governor and throttle rod linkage at the carburetor. Connect the fuel line at the sediment bowl. Install the air intake tube hose on the carburetor and tighten the hose clamps securely. Turn the fuel tank shut-off valve to the "ON" position. Start the engine and allow it to run until it reaches normal operating temperature.
Carburetor Adjustment
Three adjustments are provided in the carburetor. They are the main adjustment needle, the idle speed adjustment screw, and the idle fuel adjustment needle. There are three factors that control the conversion of the fuel / air mixture into engine power. These factors are engine compression, ignition, and correct carburetor adjustment. Correct carburetor adjustment cannot be obtained unless engine compression and ignition meet specifications. Before proceeding with the carburetor adjustment, the following preliminary steps should be performed to be sure the adjustments are made correctly: Set the idle speed adjustment screw so that the throttle plate is slightly open. Make certain that the fuel tank shut-off valve is in the open position. Pull the choke knob, turn on the ignition, start the engine and push the choke knob in until the engine runs smoothly. After the engine has reached normal operating temperature, be sure the choke knob is pushed all the way in, and proceed as follows: For the initial setting, before the engine is started, turn the idle fuel adjustment needle in (clockwise) until it is seated lightly, then
back it off approximately one turn. Start the engine and turn the idle fuel adjustment in (clockwise) until the engine begins to "roll," then back it off slowly until the engine is running smoothly. With the hand throttle in the closed position, turn the idle speed adjustment screw until the engine idle speed is 450 to 475 rpm on the Proof-Meter. On new engines it may be necessary to to set the idle speed slightly higher to prevent stalling. The power fuel adjustment or main adjustment needle initial setting is 1 to 1-1/4 turns open (counterclockwise). The final adjustment should be made in the field. With the engine running at governed speed under full load, turn the adjustment needle in (clockwise) until the power picks up and the engine runs smoothly. Hope this helps. Dan
NAA60512
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