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CARTER CARBURETOR CORPORATION, ST. LOUIS, MO., U. S. A.
Form 6571—Canadian
OLDSMOBILE 665S August, 1948
OLDSMOBILE
EIGHT
68 178 '98 ' H. T. 1947
(Superseded by 503SA)
MOTOR SERIAL NUMBERS
68-20121 and higher
78-65839 and higher
98-57993 and higher
WCD Dual Down-Draft Climatic Control Carbureter —Model 665S—List
Price $50.95
A $10.00 exchange allowance is deducted from the list price if buyer
turns in old carbureter.
CARBURETER SPECIFICATIONS
For Oldsmobile 8 Cylinder Engine: 31/4" Bore, 3N" Stroke
Dimensions: Flange size, 11/4 inch dual, 4 bolt type. Primary venturi,
11/32 inch I. D.
Secondary venturi, 19/32 inch I. D.
Main venturi, 1-3/16 inch I. D.
Float Level: Distance from seam of float (both sides—at top center)
to lower edge of bowl cover, when needle is seated to be 3/16 inch. (Use
gauge No. T109-162.)
Vents: Inside, balance vent tube .218 inch inside diameter.
Outside, none.
Gasoline Intake: Square vertical needle, size No. 42 drill in
needle seat.
Gas Line Connection: 5/ 16 inch Weatherhead connection. Low Speed Jet
Tube: Jet size, No. 68 drill.
By-pass, size No. 56 drill.
Economizer, size No. 63 drill.
Idle bleed, size No. 55 drill.
Idle Ports: Upper port, length .150 inch. Width .030 inch. Idle Port
Opening: .100 to .10'6 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: Y4 to 13/4 turns open. For richer mixture
turn screw out. Do not attempt to idle engine below 6 m.p.h. or 375 r.p.m.
Main Nozzle: In primary venturi, closed tip angle 49° from horizontal.
Nozzle is installed permanently. Do not remove.
Metering Rod (Vacumeter Type): Economy step .060 inch diameter. Middle
step tapers to .053 inch diameter. Power step .040 inch diameter. Length
3-41/64 inches.
Metering Rod Jet: .082, inch diameter.
Metering Rod Setting: Use gauge, part No. T109-163 (2.940 inches).
Accelerating Pump: High pressure delayed action type. Adjustable stroke.
Discharge jet (twin) size, No. 74 drill.
Intake disk check size, No. 30 drill.
Discharge (needle seat) size, No. 55 drill.
Relief ball check size, No. 55 drill.
Pump Adjustment: 24 as indicated on gauge T109-I17S with throttle valves
seated or 5/32 inch from top of pump shaft to top of dust cover housing.
Choke: Carter Climatic Control, set at one point rich. Offset butterfly
type. Choke heat suction hole, in bowl cover, size No. 32 drill.
Vacuum Spark Port: .051 to .053 inch diameter. Top of port .016 to .020
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 carbureter.
Spark Plug
Gap
.030"
Breaker Point
Setting
.015"
Ignition Timing
Breaker Points to Open:
(Hydra.) On ball or
.001" B.T.D.C.
(Syncra.) .002" B.T.D.C.
Valve Setting Int. .009" Exh. .011"
Float Setting (Use Gauge) 3/ 16 Inch
Idle Adjustment
Screw Setting
3/4 to 13/4
Turns Open
Copyright 1948
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