Motorcraft 5200 2 Barrel

Carburetor:

The Motorcraft model 5200 is a two system, two venturi carburetor. The primary venturi is smaller then the secondary venturi. The secondary system is operated by mechanical linkage.

The primary system includes a curb idle system, idle transfer system, accelerator pump system, main metering system and power enrichment system.

The secondary side includes a secondary idle system, main metering system, transfer system, and power system. Both the primary and secondary systems draw fuel from a common fuel bowl.

This carburetor is equipped with a fully electrically heated automatic choke. This provides for choke pull-off a short time after engine start.

An overcenter spring is provided to assist in closing the choke plate for initial starting of a cold engine in high ambient temperatures. After initial choke pull-down occurs, the overcenter spring has little or no effect on choke operation.

Several Throttle Solenoid Positioner devices are used depending upon application; a solenoid, and a combination solenoid/kicker. The solenoids operate when the ignition switch is On, and the throttle kicker is vacuum operated. A dashpot, a combination dashpot/kicker or a throttle kicker may be used. Some calibrations may require none of these devices.

The vacuum kickers are actuated when air conditioning units are turned on, by a vacuum solenoid valve. This provides higher idle when the air conditioning is operating.

Fuel Bowl Vent

All model 5200 carburetors are equipped with a vacuum-operated, solenoid-assisted fuel bowl vent.

With engine Off, a spring holds the external vent valve open. In this position, vapors from the fuel bowl are allowed to pass to the evaporative emission canister. When the engine is started, manifold vacuum acting on the diaphragm overcomes the spring pressure and pulls the external vent to its seated position. A holding solenoid, wired to the ignition circuit, makes sure the vent does not inadvertently open under low vacuum conditions. Thus, the bowl vent will only open again when the ignition is switched Off.