| Carter Carburetor No. 979S for 1953 Model IND-20A | |||||||||||
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CARTER CARBURETOR CORPORATION, ST. LOUIS, MO., U. S. A. CHRYSLER "V-8" FIRE SIREN 1953 Model Ind. 20A WCD DOWN-DRAFT CLIMATIC® CONTROL CARBURETER No. 979S CARBURETER SPECIFICATIONS Dimensions: Flange size 1-1/4 inch S. A. E. dual, 4 bolt (water jacket) type.
Float Level: See adjustments. Vents: Inside: None. Outside: Two-3/16 inch diameter vents in air horn. Gasoline Intake: Size No. 38 (.1015 inch) drill hole in needle seat. Low Speed Jet Tube: Jet size .0295 inch drill. Bypass, size No. 58 (.042 inch) drill. Economizer size .0452 inch drill. Idle bleed, size No. 58 (.042 inch) drill. Idle Port: Upper port, length .175 inch; width .030 inch. Idle Port Opening: .136 to .140 inch above upper edge of valve with valve tightly closed. Lower Port (for Idle Adjustment Screw): Size .0615 to .0655 inch diameter. Set Idle Adjustment Screw: 1/2 to 1 turn open. For richer mixture, turn screw out. Idle engine at 500 r.p.m. Main Nozzle: Nozzles are installed permanently. Do not remove. Metering Rod: Vacumeter type. Economy step .0695 inch diameter. Middle step tapers to .06675 inch diameter. Power step .062 inch diameter. Metering Rod Jet: .089 inch diameter. Metering Rod Setting: See adjustments. Accelerating Pump: Pump discharge jets: (twin) size (.0315 inch) drill. Intake ball check seat, size No. 32 (.116 inch) drill. Discharge needle seat, size No. 50 (.070 inch) drill. Pump Adjustment: See adjustments. Choke: Carter Climatic ® Control-Set at index. Butterfly type, offset valve. Choke heat suction hole, in bowl cover, size No. 43 (.089 inch) drill.Vacuum Spark Port: .030 x .110 inch. Top of port to be .035 to .041 inch above top edge of valve with valve tightly closed. Motor Tune-Up-Be Accurate! Always Use Feeler Gauges! CAUTION: Change worn or leaky flange gaskets. Tighten manifold bolts end test compression before adjusting carburetor.
NOTE: These engines are equipped with hydraulic valve lifters. - NO ADJUSTMENT. CARBURETER ADJUSTMENTS FLOAT ADJUSTMENT: Two separate float adjustments must be made--lateral and vertical. Lateral Adjustment. With bowl cover assembly inverted, bowl cover gasket removed and float resting on seated needle, place float gauge T109-205 directly under float with notched portions of gauge fitted over edges of casting. Sides of floats should barely touch the vertical uprights of float gauge. Adjustment should be made by bending arms of floats. Vertical Adjustment. With float gauge in same position, floats should just clear the horizontal portion of gauge. Vertical distance between top of float and machined surface of casting should be 11/64 inch (gauge T109-205). Adjustment can be made by bending arms of floats. Carefully remove float assembly, install bowl cover gasket and then reinstall float assembly. Floats should have a free movement of 1/2" at free end of float. Adjust by bending lip of float bracket. A fast check of the fuel level can be made on the engine by removing the inspection hole plug in the side of carbureter body. Fuel should just run out of the hole with engine idling. PUMP ADJUSTMENT: The total distance the plunger head (not shaft) moves from closed to wide open throttle position determines the amount of fuel discharged. Correct pump ! plunger travel is important and should be checked each time the carbureter is disassembled or when leaner than standard ; metering rods are installed. Procedure is as follows: Install ' pump connector link in outer hole (long stroke) of pump arm. Back out throttle lever set screw until throttle valves seat in bores of carbureter. Be sure fast idle adjusting screw does not hold throttle open. With air horn assembly removed, place Universal pump travel gauge T109-1175, inverted on edge of dust cover boss of bowl cover. Turn knurled nut of gauge until finger just touches upper end of plunger shaft. Number indicated on gauge should be "29". Hold the gauge vertical to insure correct reading. Adjust by bending throttle connector rod at upper angle: (Use took, T109-213.) Optional Adjustment: With throttle valves seated in bores? of carbureter, the distance from the top of the plunger shaft to the top of the dust cover boss should be 17/64". Adjust as mentioned above.
Copyright 1953 by Carter Carburetor Corporation All
Rights Reserved CARTER CARBURETOR CORPORATION, ST. LOUIS, MO., U. S. A. METERING ROD ADJUSTMENT: Metering rod adjustment is important and must be made after completing the pump adjustment. No metering rod gauges are necessary. Procedure is as follows: Backout throttle lever set screw to allow throttle valves to seat in bores of carbureter and loosen metering rod arm clamp screw. With metering rods in place, press down on vacumeter link until metering rods bottom in carbureter body casting. Holding rods in downward position and throttle valves seated revolve metering rod arm until finger on arm contacts lip of vacumeter link. Hold in place and carefully tighten clamp screw. FAST IDLE ADJUSTMENT: 1. Loosen choke lever clamp screw on choke shaft. Insert .040" feeler gauge T109-193 between lip of fast idle cam and boss of flange casting. Hold choke valve tightly closed and take slack out of linkage by pressing choke lever toward closed position-hold in place and tighten clamp screw. 2. With choke valve tightly closed, tighten fast idle adjusting screw until there is .017"-.021" opening (wire gauge T709-44 may be used) between throttle valve and bore of carbureter (side opposite idle port). Be sure fast idle adjusting screw is on high step of cam while making this adjustment. UNLOADER ADJUSTMENT: With throttle wide open there should be 7/32" clearance between upper edge of choke valve and inner wall of air horn (gauge T709-706). Adjust by bending unloader lip on throttle shaft lever (use bending tool T109-41). Chrysler "V-8" — 1953 — Carbureter No. 979S
— Parts so marked are new and listed for the first time. NOTE: Figures in parentheses indicate number of pieces used in one carburetrer. Where no figure is shown, only one is used.
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