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CARTER CARBURETOR CORPORATION, ST. LOUIS, MO., U.'S. A.
Form 6350C—Canadian
OLDSMOBILE 426S
March, 1939
Reprinted August 1945
CAR SERIAL NUMBERS Oshawa—935 -- 00001 and higher Regina—935--80001
and higher
OLDSMOBILE
SIX
3500 SERIES
1939
Superseded by 466S
Casting Number 243 on face of flange of 426S
WA- I Down-Draft Carbureter 426S With Climatic Control
List Price—426S, $27.95
No. 426S used on car without automatic transmission
A $6.25 exchange allowance is deducted from the list price if buyer turns
in old carbureter.
CARBURETER SPECIFICATIONS
For Oldsmobile Six Cylinder Engine, 3500 Series—3-7/16-inch Bore, 41/g-Inch
Stroke
Dimensions: Flange size, 11/4 inch S. A. E. Primary venturi, 11/32 inch I.
D.
Secondary venturi, 11/16 inch I. D. Main venturi, 1-5/16 inch I. D.
Float Level: Distance from seam of float (at free end) to tip on lower edge
of float chamber cover to be 3/8 inch when needle is seated. (See cut.)
Outside Vent: No. 10 drill size. No inside vent.
Gasoline Intake: Square vertical needle. No. 46 drill size in needle seat.
Gasoline Line Connection: 5/ 16 inch Weatherhead nipple.
Low Speed Jet Tube: Jet No. 68 drill size. By-pass in body, No. 55 drill
size.
Economizer in body, .059-.060 inch diameter. Idle bleed, No. 54 drill size.
Idle Port: Length, .200 inch; width, .030 inch.
Idle Port Opening: .158 to .162 inch with valve closed tight. Idle Screw
Seat: No. 46 drill.
Set Idle Adjustment Screw: 1/2 to 11/2 turns open. For richer mixture
Turn screw out. Do not attempt to idle engine below 6 m.p.h.
Vacuum Spark Port: .039 to .041 inch diameter. Bottom of port .021 to .029
inch above valve.
Nozzle: In primary venturi, angle 45°. Discharge jet size: upper hole:
No. 72 drill. Lower hole: No. 46 drill.
Metering Rod. (Standard Transmission) Economy step, .078 inch diameter. Middle
step, .075 inch diameter. Power step, .048 inch diameter. Length of rod,
3-9/64 inches.
Metering Rod Jet: .1015 inch diameter.
Metering Rod Setting: Use gauge, part No. T109-102 (2.468 inches).
Accelerating Pump: Low pressure type, with adjustable stroke. Discharge check
(ball type) seat size: No. 32 drill, in body. Intake check (ball type) seat
size: No. 62 drill, in body. Discharge ball check, No. 32 drill size, in
body.
Relief passage to outside, No. 42 drill size.
Pump Adjustment: 13/64 inch plunger travel. (Short stroke.) Use gauge T109-117S.
Choke: Carter Climatic Control, set two notches rich. Butterfly type, poppet
valve. Choke heat suction hole, in body, size No. 38 (.101") drill.
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.
Set
Breaker Points
.020"
Use Timing Light
Breaker Points to
Open at Top Dead
Center
Set Valves Intake .008" Exhaust .01 1 "
'. WHEN MOTOR IS
p-o ^
AT OPERATING
TEMPERATURE tVALVE CLEARANCE
Spark Plug Gap .040"
Correct Float Level
(Measure from
machined surface of
small projection to
+op of seam)
3/g inch
Idle Adjustment Screw Setting
1/2 to 11/2 Turns Open
BRIEF CARBURETER ADJUSTMENTS
Pump Adjustment: With throttle valve seated and connector link in place (short
stroke; hole nearest countershaft), pump plunger should travel 13/64" from
closed to wide open position. Adjustment should be made by bending throttle
connector rod at lower angle. Pump travel can be measured by using universalpump
stroke gauge T109-117S by placing base of gauge on ridged portion of bowl
cover so that projecting portion of pump gauge rests on top surface of connector
link at pump shaft. Hold gauge vertical. The difference between the number
shown by index mark on gauge, at wide open and closed positions, should be
13.
Copyright 1939
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