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1941 Willys Americar Model 441
CARTER CARBURETOR CORPORATION, ST. LOUIS, MO., U. S. A.
Form 6462A—Canadian
WILLYS AMERICAR 507S, 1940
Reprinted April, 1942
CAR AND
MOTOR SERIAL NUMBERS
50001 and higher
WILLYS
AMERICAR
MODEL 441
1941
Casting No. 229 on face of flange
W-O DOWN-DRAFT CARBURETER 507S-LIST PRICE $ 17.65
A $2.50 exchange allowance is deducted from the list price if buyer turns
in the carbureter which is replaced by a 507S.
CARBURETER SPECIFICATIONS
For Willys-Americar 507S—4 Cylinder
Dimensions: Flange size, 1¼ inch S. A. E. Primary venturi, 11/32 inch
I. D. Main venturi, 1.0 inch I. D.
Float Setting: Distance from float (at free end) to float chamber
cover to be 3/8 inch with free weight of float on needle and spring
(see cut).
Vents: Outside, No. 10 drill size. Inside, none. Idle well to bowl
fuel chamber No. 30 drill.
Gasoline Intake: Square vertical needle. No. 53 drill size in needle
seat.
Gasoline Line Connection: 1/4 inch weatherhead nipple.
Low Speed Jet Tube: Jet size, No. 70 drill. Idle well jet, No. 61 drill.
By-pass in body, .059 to .060 inch diameter.
Economizer in body, .0425-.0435 inch diameter.
Idle bleed, size No. 52 drill.
Idle Port: Length, .140 inch. Width, .030 inch.
Idle Port Opening: .010 to .014 inch (below lower edge of valve) with
valve tight closed. Idle Screw Seat: No. 46 drill.
Engine, 3l/8 Inch Bore, 4% Inch Stroke
Set Idle Adjustment Screw: l/2 to Il/2 turns open. For richer mixtures,
turn screw out. Do not attempt to idle engine below 8 miles per hour.
Main Nozzle: (Flush type) In primary venturi, angle 30°. Discharge jet
size, .096 inch diameter.
Metering Rod: Economy step, .0695 inch diameter, second step tapers
to .055 inch diameter. Power step, .055 inch diameter. Length, 3-25/64
inches.
Metering Rod Jet: Size, .078 inch diameter.
Metering Rod Setting: Use gauge, part No. T109-26 (2.718 inches).
Accelerating Pump: High pressure type, spring operated. Discharge jet
size, No. 73 drill.
Relief passage to outside, size No. 42 drill.
Intake boll check size, No. 40 drill.
Discharge disk check size No. 40 drill.
Pump Adjustment: 7/32 inch plunger travel at full throttle position.
Use gauge T109-117S.
Vacuum Spark Port: .054 to .056 inch diameter. Top of port .042 to
.048 inch above upper edge of valve.
VIEW CARBURETER WITH FLANGE DOWN AND FLOAT CHAMBER AT RIGHT
Throttle Lever: Adjusting, on left side. When open, points Throttle and
Choke Valves: Inter-connected to open throttle
toward you. valve to fast idle position when choke is in use.
Choker: Offset, butterfly type with compensating (poppet) air Tube Clamp:
In front with bracket extending to left side. valve. Choker lever (semi-automatic)
on left side.
Motor Tune-Up—Be Accurate! Always Use Feeler Gauges!
Caution: Change worn or leaky flange gaskets. Tighten manifold bolts and
test compression before adjusting carbureter.
Spark Plug Gap .030"
Set Valves
(Cold)
Intake .014"
Exhaust .014"
Use Timing Light
Breaker Points to
Open at Top Dead
Center
Correct Float Level
(Measure from machined
surface of casting)
(See note on Page 2) Turns Open
Set
Breaker Points
.020"
Idle Adjustment
Screw Setting
I/2 to 11/2
BRIEF CARBURETER ADJUSTMENTS
Pump Adjustment: Back out throttle lever set screw. With TI09-117S by placing
base of gauge on raised portion of bowl
throttle valve seated, pump should travel 7/32" from closed cover so that
projecting ear of pump gauge rests on top surface
to wide open position. Adjustment can be made by bending of pump shaft. Hold
gauge vertical. The difference between
throttle connector rod at lower angle with tool T109-41. Pump the number shown
by index mark on gauge, at wide open and
travel can be measured by using universal pump stroke gauge closed positions,
should be 14.
Copyright 1940