Carter WD0 2 Barrel Carburetor 440S
1939 Buick Model 40
Carter WD0 440S Carbuetor Kit
Dimensions: Flange size: 1″ dual, 3 bolt type
Primary venturi: 11/32″
Secondary venturi: 21/32″
Main venturi: 1 1/16″ ID
Float level: Distance from float to bowl cover to be 3/16″ when needle is seated.
Outside vent: No. 10 drill
Anti percolation vent tube: Above nozzle, 20 deg tip. Inside diameter No. 42 drill. Relation tip of tube to inside primary venturi .065″
Gas line connection: 5/16″ fitting
Low speed jet tube:
Jet size No. 70 drill
Bypass (plug) No. 55 drill
Economizer in body No. 58 drill
Idle bleed No. 56 drill
Idle ports: Upper port, slot type, length .1″ width .030″
Top of port .060″ to .066″ above upper edge of valve.
Lower port size .0615″ to .0655″ diameter.
Idle adjustment screw: 1/2 – 1 1/4 turns open. For richer mixture turn screw out.
Main nozzle: In primary venturi angle 45 deg. Discharge jets size: upper hole No. 75 drill, Lower hole No.52 drill
Metering Rod: Economy step, .063″ diameter; second step tapers to .059″ diameter; third step .059″ diameter; power step .055″ diameter. Length of rod, 2.922″
Main jet: .082″
Metering rod setting: 2.280″
Adjustment should be made when reassembling carburetor or when leaner than standard rods are installed. Do not disturb the pump adjustment.
Accelerating pump: Discharge jet size No. 74 drill
Intake ball check No. 40 drill (in body)
Discharge ball check No.50 drill (in body)
Relief passage to outside, No. 42 drill
Pump adjustment: 21/64″ plnger travel (in center of medium stroke)
With pump connector link in medium stroke and throttle adjustment screw backed out, pump plunger should travel 21/64″ from closed to wide open position. Adjustment can be made by bending hrottle connector rod at lower angle.
Starter switch: Connect the red (hot) wire to switch terminal closest to motor.
Unloader adjustment: with throttle wide open, distance between upper edge of choke valve and inner wall of air horn should be 3/16″. Adjust by bending lip on fast idle connector link. With throttle wide open, push choker valve open. Choke should lock in wide oopen position. If it does not lock, recheck unloader adjustment. Closing the throttle will release choker valve. Choker trip lever is notched out for this setting.
Fast idle adjustment: Hold choker valve tightly closed and adjust fast idle arm srew to give .018″ opening between edge of throtle valve and bore of carburetor, size opposite port.
Updated on 12/08/2020