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Form 6514—Canadian
OLDSMOBILE 480S—503S CARTER CARBURETOR CORPORATION, ST. LOUIS, MO.,
U. S. A. October, 1945
MOTOR SERIAL NUMBERS 1941—LA-379001 and higher 1942—LA-450001
and higher
NOTE: 4805 used on cars equipped with Hydra-Matic Transmission only. 503S
used on Syncro Mesh Transmission cars only.
OLDSMOBILE
"E41- J41 - L41"
EIGHT-1941
"68-78-98"
EIGHT-1942
(480S Superseded by 503S)
Casting No. 342 on face of flange.
Dual Down-Draft Vacumeter Climatic Control Carbureters—Models 480S-503S
List Price $38.20
A $7.50 exchange allowance is deducted from the list price if buyer turns
in old carbureter.
CARBURETER SPECIFICATIONS
For Oldsmobile 8 Cylinder Engine: 31/4 Inch Bore, 378 Inch Stroke
Dimensions: Flange size, 11/8 inch dual, 4 bolt type. Primary venturi, 11/32
inch I. D.
Secondary venturi, 21/32 inch I. D.
Main venturi, 1-3/16 inch I. D.
Float Level: Distance from float to bowl cover, when needle is seated to
be 3/16 inch. (Use gauge No. T109-28.)
Vents: Outside, No. 10 drill—four holes. Inside, none.
Gasoline Intake: Square vertical (push-pull) needle. Size No. 38 drill hole
in needle seat.
Gas Line Connection: 5/ 16 inch Weatherhead nipple. Low Speed Jet Tube: Jet
size, No. 71 drill.
By-pass (plug), size No. 51 drill.
Economizer, size No. 50 drill.
Idle bleed, size No. 53 drill.
Idle Ports: Upper port, slot type, length .200 inch. Width, .030 inch.
Idle Port Opening: .144 to .150 inch above upper edge of valve with valve
closed tight.
Lower Port (For Idle Adjustment Screw): Size, .0615 to .0655 inch diameter.
Set Idle Adjustment Screw: 1/2 to 21/4 turns open. For richer mixture turn
screw out. Do not idle engine above 375 R.P.M. on Hydra-Matic cars (480S)
or below 425 R.P.M. on Syncro-Mesh cars (503S). (Use Tachometer.)
Main Nozzle
Slip Nozzle, flush type (angle tip) seats in primary venturi, at 45° angle.
Discharge jet size, .110 inch diameter.
Inner Nozzle (seats in slip nozzle). No. 31 drill I. D. Nozzle Retainer Plug:
Jet size, No. 51 drill.
Venturi to Nozzle Relation: .305 inch plus or minus .005 inch. Metering Rod
(Vacumeter Type): Economy step, .072 inch
diameter. Middle step tapers to .0645 inch diameter. Power
step, .051 inch diameter.
Length 2-59/64 inches.
Metering Rod Jet: .089 inch diameter.
Metering Rod Setting: Use gauge, part No. T109-113 (2.280 inches).
Accelerating Pump: High pressure type (spring operated lever). Discharge
jet (twin) size, No. 72 drill.
Relief passage (slots) to air horn.
Intake ball check, size No. 40 drill.
Discharge (needle seat) size, No. 50 drill.
Pump Adjustment: 19/64 inch plunger travel (full throttle position). Use
gauge No. T109-1175.
Choke: Climatic Control—480S set 2 points rich, 503S-5055 set at index.
Butterfly type, offset valve. Choke heat suction hole, in body, size No.
38 (.1015 inch) drill.
Vacuum Spark Port: .039-.041 inch diameter. Top of port .029-.033 inch above
valve.
Motor Tune-Up—Be Accurate! Always Use Feeler Gauges!
CAUTION: Change worn or leaky flange gaskets. Tighten manifold bolts and
test compression before adjusting carburetor.
Use Timing Light
Breaker Points to Open Set Valves
Plug Gap Breaker Points 002" Before Intake .008" Top Dead Center
.030" .015" *See Note Below Exhaust .011" *Breaker points
to open for No. 1 cylinder when steel ball in fly wheel is in not T. D. C.).
throttle held to closed posttron, pump plunger should travel 19/64" from
closed to wide open position. Adjustment can be made by bending throttle
connector rod at lower angle. (Use tool T109-75). Pump travel can be measured
by using gauge T109-117S. Ear on gauge indicator should be placed on top
surface of pump shaft.
METERING ROD ADJUSTMENT should be made when re-assembling carbureter or when
leaner than standard rods are installed. (Do not disturb pump adjustment.)
Correct set-
Spark
Set
Correct Float Level
(Remove Cork Gasket) 3/16"
line with pointer in fly wheel housing (Steel ball is
Idle Adjustment
Screw Setting
1/2 to 2¼
Turns Open
BRIEF CARBURETER ADJUSTMENTS
PUMP ADJUSTMENT: With pump connector link in place Ling of metering rods
is important. Procedure is as follows:
in pump arm. throttle adjustment screw backed out and A. Remove air horn
and climatic control assembly.
B. Back out throttle lever adjusting screw, so that throttle valves seat
in throttle bore.
C. Remove pin spring from metering rod pin and.slide the pin from vacuum
piston link, taking care that metering rod spring is not bent. Lift out metering
rods and remove brass metering rod disk retainer by loosening small brass
screw. Remove, but do not lose the two small metering rod disks beneath this
plate.
Copyright 1945
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