What is shown in Fig. 4.14?

An exploded view of the Model 7200 VV carburetor main body, with parts labeled such as the venturi valve diaphragm assembly, spring, spring guide and cover, check ball and check ball weight, pintle spring and pintle valve, expansion plug, gasket, venturi valve stop screw, feedback stepper motor, and throttle body gasket.

How do you make the preliminary idle speed adjustment?

Set the fuel mixture screws to the full counterclockwise position allowed by the limiter caps, back off the idle speed adjusting screw until the throttle bore plates are seated, then turn the idle adjusting screw inward until it initially contacts the throttle stop and turn it an additional one and one half turns.

What precautions apply when reinstalling the carburetor?

Clean all mating surfaces of old gasket material, install new gaskets, and tighten the retaining nuts to the proper torque without over-torquing, as over-torquing can warp the carburetor base plate.

Are the external carburetor adjustments permanent?

No. The manual states they should be regarded only as temporary adjustments, and the vehicle should be taken to a facility with proper instruments to set the idle mixture and idle speed within the range on the Emissions Control Information label.

What should be done before removing the carburetor?

Disconnect the negative battery cable, remove the air cleaner, disconnect and plug the fuel feed line, and mark all vacuum lines, electrical leads, hoses and linkages so they can be reinstalled correctly.

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1981 Ford Bronco Carburetor Removal & Adjustment - 7200 VV Exploded View

Carburetor removal installation and idle adjustment procedure with 7200 VV main body diagram

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Haynes page covering carburetor removal/installation steps and idle-speed/mixture external adjustments, with a labeled Model 7200 VV main body diagram.

AI caption September 2010 · Photo 34 of 108

This is page 152 from Chapter 4 (Fuel and exhaust systems) of a repair manual, filed with a 1981 Ford Bronco. It contains two service procedures. Section 3, 'Carburetor – removal and installation,' lists a 15-step procedure covering battery disconnection, air cleaner removal, fuel line disconnection, marking of vacuum lines and electrical leads, removal of retaining nuts, cleaning the mating surfaces, installing new gaskets, and cautions against over-torquing the retaining nuts to avoid warping the carburetor base plate. Section 4, 'Carburetor – external adjustments,' notes that all U.S. carburetors have idle mixture limiter caps, that adjustments are temporary, and that the underhood Emissions Control Information label should be followed. It gives a preliminary idle speed procedure (mixture screws full counterclockwise within limiter range, back off idle screw, then turn in one and one half turns past initial contact) and begins an engine-running idle speed procedure with safety steps. The lower half of the page shows Fig. 4.14, an exploded view of the Model 7200 VV carburetor main body, with labeled parts including the venturi valve diaphragm assembly, spring, cover, check ball and weight, pintle spring and valve, feedback stepper motor, expansion plug, and throttle body gasket.

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Frequently asked questions

What is shown in Fig. 4.14?: An exploded view of the Model 7200 VV carburetor main body, with parts labeled such as the venturi valve diaphragm assembly, spring, spring guide and cover, check ball and check ball weight, pintle spring and pintle valve, expansion plug, gasket, venturi valve stop screw, feedback stepper motor, and throttle body gasket.
How do you make the preliminary idle speed adjustment?: Set the fuel mixture screws to the full counterclockwise position allowed by the limiter caps, back off the idle speed adjusting screw until the throttle bore plates are seated, then turn the idle adjusting screw inward until it initially contacts the throttle stop and turn it an additional one and one half turns.
What precautions apply when reinstalling the carburetor?: Clean all mating surfaces of old gasket material, install new gaskets, and tighten the retaining nuts to the proper torque without over-torquing, as over-torquing can warp the carburetor base plate.
Are the external carburetor adjustments permanent?: No. The manual states they should be regarded only as temporary adjustments, and the vehicle should be taken to a facility with proper instruments to set the idle mixture and idle speed within the range on the Emissions Control Information label.
What should be done before removing the carburetor?: Disconnect the negative battery cable, remove the air cleaner, disconnect and plug the fuel feed line, and mark all vacuum lines, electrical leads, hoses and linkages so they can be reinstalled correctly.