The same models that use the kickdown limit switch use a dashpot control.

The function of the dashpot control is to retard the closing of the throttle valves and thus provide sufficient time to clear the induction chambers of the fuel charge before the throttle valves return to the slow idle position.

At car speeds of 7 MPH or less in the low speed rance or 15 MPH or less in the high speed range, the transmission governor points CLOSE to energize the magnetic core which pulls plunger (G) DOWN to permit the check valve ball (H) to rest on its seat. With the check valve on its seat, the only escape for the air from the diaphragm chamber is through the drilled passage in plunger (I) and the clearance around the metering-pin (J). The restriction caused by the metering-pin retards the closing of the throttle valves to normal slow idle position when the ear (K) on the throttle lever comes in contact with the diaphragm plunger.

At car speeds above 8 MPH in the low speed range or above 15 MPH in the high speed range, the dashpot electric magnet is NOT energized since the transmission governor points remain OPEN. The compression spring (L) is then free to raise the plunger (G) and move the check valve ball off its seat. The air from the diahragm chamber is then free to escape to the opposite side of the diaphragm through channel (M) and check valve, whic offer little or no restriction to the closing of throttle valves.

Place metering pin #3 in side hole of push rod. Insert push rod in hole of housing and align diaphragm with housing.

Place large diameter end of spring #4 on diaphragm plate, then assemble rear housing and replace attaching screws #6.

Insert check ball #1 in housing and replace drive plug.

Insert stem end of plunger #5 in housing, place plunger spring in magnet and assemble gasket & magnet on housing. Securely tighten screws.

Place bracket #2 on housing, as shown, replace lock washer, sleeve nut, spring and adjusting screw.