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Carburetors for old Dodge Trucks : DODGE TRUCK 1946 1947

Form 6549—Canadian DODGE TRUCK EYBI-EYB4
August, 1947
DODGE TRUCK 1946-1947
BB DOWN-DRAFT CARBURETERS WITH GOVERNOR—EYBI-EYB4—LIST PRICE $53.75
(EYBI Superseded by EYB4)
DODGE MODEL WK-WR
EXCHANGE ALLOWANCE $10.00
Note: Truck Serial No. 81785001 and higher. Motor Nos. T-135, 1001 and higher
CARBURETER SPECIFICATIONS
Six Cylinder Engine: 33/4 Inch Bore, 5 Inch Stroke
Dimensions: Flange size, 11/2 inch S. A. E. Throttle bore, I-I I/16 inch (42.86 mm). Main venturi, I-I I/32 inch (3.413 mm).

Float Setting: Top of float 5/64 inch (1.98 mm) plus or minus 1/64 inch (.397 mm) below top surface of carbureter body casting.
Vents: Outside: none. Inside: balance vent tube .218 inch
(5.56 mm) inside diameter.
Gasoline Intake Needle: Triangular, horizontal, needle seat hole No. 44 (2.18 mm) drill.
Idle Orifice Tube: (EYBI) Jet size .0295 inch (.75 mm). (EYB4) Jet size .0276 inch (.70 mm).
Idle passage air bleed (in air horn), size .0688 inch (1.75 mm).
(EYBI) Idle restriction in body, size .059 inch (1.50 mm). (EYB4) Size .0629 inch (1.60 mm).
Idle Ports: Upper port: slot type. Length, .128 inch (3.251
mm). Width, .027 inch (.686 mm).
(EYBI) Top of port .069 inch (1.75 mm) to .079 inch (2.00 mm) above top edge of valve.
(EYB4) Top of port .088 to .098 inch (2.235 mm to 2.489 mm) above top edge of valve (in slot).
Lower port size: .053 to .057 inch (1.35 to 1.45 mm) diameter For idle adjustment screw).
Set Idle Adjustment: (EYBI) 1/4 to 3/4 turns open, (EYB4) 3.4 to 11/4 turns open. For richer mixture turn screw out. Do not idle engine below 500 to 600 r.p.m. motor speed.
Vacuum Spark Port: None.
Main Metering Jet: Calibrated to flow 344 to 348 cc per minute. Do not gauge for size. If in doubt, replace with new part.
Main Vent: Fuel chamber to vent tube well (in air horn), size .063 inch (1.60 mm) diameter. In vent tube plug, size .0433 (1.10 mm) diameter.
Main Vent Tube: Side holes: 1—.0354 (.90 mm) diameter, 3/32 inch (2.381 mm) from end.
I-.0354 (.90 mm) diameter, 1/8 inch (3.175 mm) from end. 1—.0236 (.60 mm) diameter, 1/2 inch (12.70 mm) from end. 1—.0236 (.60 mm) diameter, 17/32 inch (13.49 mm) from end. 1—.0157 (.40 mm) diameter, 1-15/32 inch (37.31 mm) from end.
Step-Up Jet: Size, .0492 (1.25 mm) diameter.
Accelerating Pump: Type, vacuum operated. Stroke, non-adjustable. Pump intake passage ball check seat, size .115 to .120 inch (2.93 to 3.05 mm) diameter.
Pump discharge passage, ball check seat size, .062 to .065 inch (1.58 to 1.65 mm) diameter.
Pump discharge jet, size .0315 inch (.80 mm) diameter.
Choke: Manual—offset butterfly type, with poppet valve.
FOR GOVERNOR INSTRUCTIONS, SEE FORM 6545
MOTOR TUNE-UP
Spark Plug Set Breaker Use Motor Gauge
Gap Points Breaker Points to Open
.025" .020" T.D.C.Set Valves
(Hot) Float Setting
Intake .010" 5/64 Inch Exhaust .018"
Idle Adjustment
Screw Setting
(EYBI) I/4 to 3/4
Turns Open
(EYB4) 3/4 to 11/4
Turns Open
Copyright 1947