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On 1956 models one point rich. With choke valve tightly closed, tighten fast idle adjusting screw (K) (on high step of cam) until there is the clearance as listed on carburetor specification page between throttle valve and bore of carburetor, side opposite idle port. A stand pipe is provided at both needle seats as an additional trap for foreign material that might prevent the needle valves from seating properly. A fuel pump cannot be tested by unhooking the line and seeing if gas comes out. There should now be 9/64 clearance between upper edge of choke valve and inner wall of air horn. Ethanol leaves deposits behind that acts like corrosion. parts. Did the old gasket get removed? The bowl vent is used to vent the float bowl, otherwise a siphoning of the gas can occur. Carter WCFB 4 Barrel Carburetor Float System, Engine wont idle, or dies after the choke is opened, or runs better when choke closed. . A stand pipe is provided at both needle seats as an additional trap for foreign material that might prevent the needle valves from seating properly. Hold a straight edge across top of dust cover housing, next to the pump arm. The correct way is to use a fuel pump pressure gauge. I have repeated multiple times with same results. Though fuel float bowl full, cant get gas into the accelerator pump chamber of the carb. 5:04. Float adjusted wrong check float level.Float leaking heat up some water and immerse the float. Press down on the vacummeter link (H) until the metering rods bottom in the carburetor body (J). The flat surface of the pump arm should be parallel to the straight edge. Press down on vacuum piston link C until metering rods bottom in the carburetor body. From my experience it is the most complete and comprehensive source for all things carburetor, encompassing a massive spectrum of makes models and applications. Test the needle by holding it down gently with a brass drift punch. 1956 Chevrolet Corvette & Super Power Kit Engine Idle Speed, Idle Mixture and Throttle Linkage Adjustment Procedure. You are flooding (getting too much gas in the float bowl), caused by these types of problems. A float lifter spring, which is connected to the lever arm of the primary float and to a bracket on the accelerator pump plunger, is incorporated to stabilize primary bowl fuel level and prevent float bounce upon sudden stops, or on rough roads (these springs are nowhere to be found). The piston is brass and can be damaged very easily. Make sure the pump relief check is clean. To correct, remove carburetor and turn it upside down. The high speed air bleed and the secondary bleed tube also acts as an anti-percolator. Install the pump connector rod (D) in the outer hole, long stroke. Carter WCFB Accelerator Pump Quick test to see if the accelerator pump is working. I purchased from you a rebuild kit for Carter WCFB 4 barrel carb on my 1955 Chev. Please complete the fields below to send your friend a link to this product. The idle mixture screws adjust the amount of air/fuel mixture that goes up to the venturi at idle. Adjust by bending the connector rod at the lower bend (E). 1957 Desoto Adventurer Loose Throttle Lever Rear Carburetor. The well should fill with fluid. Gasket between bowl and base is installed backwards (easy to do). This is an electronic rebuild manual, no physical copy will be provided. Can't find the answer you're looking for. 1st check to make sure the fast idle linkage isnt holding the valves open. The file is in PDF format, you can download and save/print a copy. This is caused by side strain on throttle lever due to misalignment and maladjustment of the carburetor interconnection rod. Can you help me out? Rochester and Carter replacement parts are interchangeable. This E-manual is pictured with the Carter WCFB carburetor with the upper auto choke. Carter WCFB 4 Barrel Adjust Float Mikes Carburetor 21.4K subscribers 5.5K views 4 years ago https://www.carburetor-parts.com is providing this video about adjusting the float level and. Do not depress float lip against spring in needle, but let float rest of its own weight. The item you are trying to purchase is currently out of stock.Please enter your name, email, and phone number below. Can't find the answer you're looking for? Make sure manifold heat control valve is free. As the throttle is opened the pump moves down the pump well forcing the intake check closed and forcing fuel out the main discharge. Each float on the float assembly should be at the same height and centered so that they dont rub the side of the float bowl. Any pressure put on the needle will damage it. There should be a retainer keeping the check ball in place. Other 4 barrel carburetors such as the Carter AVS, Carter TQ, Rochester 4GC, and Rochester Q-Jet have a tensioned secondary spring. Rebuilding Carter BBD carburetor part 3 - Duration: 5:04. The metering rod adjustment should be done after the pump adjustment. Hold air horn upside down with floats in place and gasket removed. This circuit provides a measured amount of fuel when needed on acceleration until the vacuum and main circuit can take over. We use a small bottle type of brush and spray silicon spray into the cylinder while we clean. I have a 1952 Buick Roadmaster and just rebuilt the Carter WCFB carb, and I'm setting the idle according to the factory manual. Hold throttle valve wide open and close choke valve as far as possible without forcing. Quick test to see if the accelerator pump is working. Also make sure one isnt rubbing on the side. Adjust by bending float arms, making sure both pontoons on each float are the same height. The Carter WCFB and AFB designs fit easily beneath the low profile C1 and C2 hoods. Both Carter and Rochester engineers determined that, on some applications, the float level in the primary side of the carburetor should be different than in the secondary side of the carburetor. The download link will expire in 30 days. When adjusting the screws doesn't change the RPM then it means there is a problem with either the air, or the amount of fuel. We will contact you as soon as this product is available. Some have a coating to give it a better shelf life. 57-65 WCFB 1 x 4 carb - Cover only no spring or spring plate CUD3741 $ 4.99 Gasket - Base WCFB 4GC G402 $ 4.95 Flange Gasket G1164 $ 4.95 WCFB Air Cleaner Gasket . Gasket removed as shown A. Be careful removing the intake check retainer. The accelerator pump is used to provide an extra squirt of fuel when you step on the gas. pump rod until the top of the pump arm is horizontal (or the screw that retrains it is perfectly vertical, if you prefer). 1963-64 Studebaker Carter AFB 1962-1965 Chevrolet 327 and 409 engine carburetor manual 1958-1968 Lincoln carburetor manual AVS 1966 Chevrolet 327 and Marine Carter AVS carburetors BB Ball and Ball Single Barrel downdraft manual: 1939-60 Chrysler, Dodge, Plymouth Carter BB, BB1, BB1A and BB1D updraft Carter BB for IHC BBD Place the choke housing toward the left and remove upper right main body to throttle body screw. The discharge check is seated at this time to prevent air being drawn into the pump well. All late model WCFB carburetors have three different length bowl cover screws. You need to run wire down all small passages. FREE to our customers that buy a rebuild kit. The balance passage also tends to prevent flooding in the event one of the needles should temporarily become stuck open by maintaining equal fuel level between the two float chambers. Carter WCFB 4 Barrel Accelerator Pump Circuit Carter BB Carburetor Assembly Part 1 of 2 Rochester Quadrajet Idle Tube Removal Tunning Rochestor Quadrajet 4 barrel Carburetor Mark Osborne. Recheck float adjustments. Place the choke housing toward the left and remove upper right main body to throttle body screw. Blowing out passages will not get them clean enough. The metering rods must be installed after the pump adjustment or when leaner than standard rods are installed. 41-108N Carter 2818S Carter 3059S What Has Been Done to This Carburetor?1. With choke valve held closed and fast idle adjusting screw C, or fast idle adjusting tang, on high step of cam. Check the low speed jets to make sure they are clear (#44). Reinstall carburetor, align and readjust inter connecting rod to manufacturers specifications. There should now be .018 .023 clearance between throttle valve and bore of carburetor (side opposite idle port). 41-98N Carter 2366S Carter 2505S Carter 2555S Carter 2655S Carter 2669S. The download link can be found on your order confirmation email which you will receive as soon as you complete the order. Use a brass drift punch. Put some fluid in theaccelerator pumpwell and press down on the pump. No metering rod gauges are necessary. If a loss of rpm is noted, or if the engine dies, and air leak exists. Blow air through the main discharge to make sure the passage is clear all the way to the pump well. New fuel pumps are especially suspect. The float lifter spring also provides better float and fuel level stability when operating on rough, washboard type roads.A balance passage connects the primary and secondary float chambers to provide fuel level control when the vehicle is accelerating, stopping, or rounding curves. Examine the viton tip for any marks.Fuel pump pressure could be too high. The distance from the dust cover boss to the top of the plunger shaft should be 1/2 inch (distance from base to tip of finger on gauge) (C). The float lifter spring also provides better float and fuel level stability when operating on rough, washboard type roads. This is percolation. Adjust by bending lip of float, not float arm. As the spring fatigues, the air valve will open too soon, creating an instantaneous lean condition, and a bog. Enter Carb Number. Fuel enters the primary side of the carburetor through a strainer screen at the fuel inlet and is directed to the primary needle valve and . Take the top off and put the pump in the well all the way to the bottom. Adjusting the WCFB Metering Rods The Carter WCFB, 4 barrel carburetor metering rods are used to meter the fuel getting into the carburetor bore. Includes theory, diagrams, detailed specifications, tune-up data and complete overhaul procedures. Any bubbles indicates a leak.Make sure the 2 floats are the same height. Inspiration for this arrangement was provided by the federal government through its exhaust emissions regulations. Access our free Idle Speed and Mixture Repair Guide for Chevrolet Corvette 1963-1982 through AutoZone Rewards. Carburetors equipped with an adjustable bowl vent require adjustment. Adjust idle screws D to produce a smooth idle of correct speed is obtained.