carter wcfb carburetor adjustment

The ends of the connector rod should point to the throttle arm side. To prevent fuel from being drawn through the pump circuit, the passage to the pump jets is vented by a cross passage to the carburetor bowl above the fuel level. One of the butterflies is open about 1/8 with the carburetor dis assembled. When closing the throttle, the accelerator moves up in the pump well. b. To correct, remove carburetor and turn it upside down. Refer to the Adjustment Data Table for adjustment dimensions. These diagrams include: Fig. Seat the discharge check by tapping lightly in the hole to form a good seal. There should now be .018 .023 clearance between throttle valve and bore of carburetor (side opposite idle port). parts. Measure from toe B to air horn. Rotate screw C, or bend tang, until throttle valves are open the distance listed in, With throttle valves held wide open, there should be a clearance between upper edge of choke valve and the inner wall of air horn (. Gasket removed as shown A. Can fill the accelerator chamber with a syringe (through top open passages of forward barrels where choke butterfly is) and the jets will spray gas into forward chambers (and will idle and accelerate for about 15 seconds)but when that gas is depleted, the spraying stops. Some have a coating to give it a better shelf life. Because the float is maintained in a level position, needle valve bounce is minimized and excess fuel entry into the bowl is prevented. With choke valve held tightly closed, take slack out of linkage and tighten clamp screw on choke lever. A balance passage connects the primary and secondary float chambers to provide fuel level control when the vehicle is accelerating, stopping, or rounding curves. Note te larger box, and the number of additional tools from the 1935 set. Carter WCFB Accelerator Pump Quick test to see if the accelerator pump is working. The bowl vent is used to vent the float bowl, otherwise a siphoning of the gas can occur. This allows air instead of fuel to be drawn off the pump jets. Hold a straight edge across top of dust cover housing, next to the pump arm. A WGD usually has a pump arm like that of a WCFB (IIRC). While holding the parts as indicated above, rotate the metering rod arm B until the finger on the arm at D contacts the lug on the vacuum piston link C. Primary & secondary float will probably have different measurements. Once you get the piston out, clean, Carter WCFB Vacuum Piston the cylinder so that the piston move very free up and down. Gasket between bowl and base is installed backwards (easy to do). Carter WCFB Accelerator Pump Adjustment The accelerator pump is used to provide an extra squirt of fuel when you step on the gas. When I slow down to an idle, my engine runs rough. At idle you are at maximum vacuum which makes the metering rods drop down into the main jets. As the accelerator is released and the primary throttle plates are closed to the idle position, the upward movement of the pump plunger and attached spring bracket exerts tension on the spring and tends to stabilize the float in a level position. Probably around 4- 4.5lbs. The flat on top of the pump arm should be parallel to the straight edge. Other 4 barrel carburetors such as the Carter AVS, Carter TQ, Rochester 4GC, and Rochester Q-Jet have a tensioned secondary spring. Will Carter introduced the world's first 4-barrel carburetor, the WCFB (Will Carter Four Barrel) which raised air-flow to unprecedented levels. 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 seat. Be sure these ports are clear. Fast, secure e-book download. Be careful when removing the top of the carburetor that you don't force things and break the piston lever. Hold throttle valve wide open and close choke valve as far as possible without forcing. Rotate throttle stop screw E until engine idle at approx 500 RPM. The all-aluminum AFB (Aluminum Four Barrel) was a big innovation in 1957, and lives on today under the Edelbrock name. Carter WCFB Build Sheets Product information . When replacing them hold them tight against the wall while tightening the screw. The lower edge of vent valve cap should be raised above surface of dust cover the distance listed in the. The adjustment of the pump is important in order to get the required fuel. With throttle valves seated in bores, dust cover and gasket in place. Rebuilding Carter BBD carburetor part 3 - Duration: 5:04. Carburetors equipped with an adjustable bowl vent require adjustment. A fuel pump cannot be tested by unhooking the line and seeing if gas comes out. Make sure the ball rattles. Is there a pointed check weight in the main discharge hole. With engine running, check for an air leak at front left corner of carburetor between throttle body and bowl by squirting carb cleaner at this point. Metering rods for the WCFB have been out of production for several years now. a. Do not depress float lip against spring in needle, but let float rest of its own weight. Back off the idle screw so that the throttle plates close completely. Procedure is as follows: with the throttle lever set screw backed out and throttle valves seated in bores of carburetor, press down on vacumeter link (D) until metering rods bottom at (E). Watch this. Each size must be used in its own location. DO NOT apply any pressure on the needle. As for the pump not squirting.I suspect the pump well isnt filling up. The metering rod adjustment should be done after the pump adjustment. Adjusting the WCFB float level and float drop. 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 . Holding the rods down and seated in the bottom (J), revolve metering rod arm until finger on arm contacts lip (K) of vacumeter link. Adjust by bending lip of float, not float arm. Blow air through the main discharge to make sure the passage is clear all the way to the pump well. I have taken this carb a part and rechecked floats adjustments and blown out passages with compressed air thank you. Also check for overheating of the engine, fuel lines too close to the manifold, or too much heat in the engine department. Press down on the vacummeter link (H) until the metering rods bottom in the carburetor body (J). The suction along with the fuel weight pulls fuel through the intake check via the passage to the fuel bowl. If it is, tap gently with a hammer and the same brass drift punch to seat it, or replace the check weight. The float lifter spring also provides better float and fuel level stability when operating on rough, washboard type roads. Adjust by bending arm (J) on choke trip lever. 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. Be careful removing the intake check retainer. Install the pump connector rod (D) in the outer hole, long stroke. If adjustment is required, remove dust cover and bend arm that operates the vent mechanism. Once engine speed gets high enough, the carburetor vacuum is strong enough to pull fuel through the main jet and the accelerator pump circuit is no longer used. Can't find the answer you're looking for? Did the old gasket get removed? Hold air horn upright with floats hanging. Everyone Has Started an Engine in the . 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). Adjust by bending unloader lip on throttle shaft lever. Use a brass drift punch. The fuel is also conducted through a passage in the air horn to the secondary needle seat. They sometimes need trimming. Carter WCFB Rebuild kits: Rebuild Kits. 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 . The accelerator pump circuit resides on the primary side of. With bowl cover assembly inverted and float resting on pin in seated needle, and with gasket removed, the distance from the bowl cover to the top of float should be 7/64. 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. 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. See figure 9F-2.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). Manufacturer CARTER : Brand CARTER WCFB : Model Carter 4 BBL WCFB : Item Weight 12 pounds : Country of Origin USA . Make sure there is a check needle below the main discharge. You are flooding (getting too much gas in the float bowl), caused by these types of problems. Ethanol leaves deposits behind that acts like corrosion. I have repeated multiple times with same results. Check your auto manual for the spec, but somewhere around 4-5 lbs would be good.Be sure the power piston is not frozen in one position. Clogged idle tube, or passages in the idle circuit. Carter carburetors fitted with air bleed idle mixture adjustment also have fuel emulsion mixture needles, but these are sealed at the factory to limit the amount of fuel admitted during idle. . A bushing (sorry dont have size) can be permanently installed in the choke vacuum passage in main body casting provides a more positive seal at this point, and prevents fuel from leaking into this passage on left turns and stalling the engine because of too rich a mixture. Examine the viton tip for any marks.Fuel pump pressure could be too high. This check prevents excessive pressure in the discharge passage during acceleration. 1st check to make sure the fast idle linkage isnt holding the valves open. *New Main Body Gasket8. William C. Carter was born in Union City Tennessee in 1884. Fig. 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. Adjust by bending the connector rod at the lower bend (E). No metering rod gauges are necessary. Carter WCFB Adjustments Metering Rod Adjustment Back out throttle screw so that the throttle valve close completly. It isn't unusual for the vacuum piston on the WCFB to become frozen in the cylinder where it resides. Carter built the first successful 4 barrel carburetor, the WCFB (Will Carter Four Barrel) which first appeared in 1953 on Buick cars. It will be very helpful as I try to improve my performance and emissions of my 57 Corvette street machine. *New Airhorn Gasket7. Watch on. You may even have to resort to finding a used WCFB carburetor. Find many great new & used options and get the best deals for 19571958 Plymouth Fury Carter WCFB Carburetor *Remanufactured at the best online prices at eBay! Disassembly2. 1956 Plymouth, Powerflite Transmission - Dashpot The dashpot has been eliminated. This is an electronic rebuild manual, no physical copy will be provided. Tyler's Forgotten Car Rescue 22,933 views. What Has Been Done to This Carburetor?1. With rods held in this position, revolve metering rod arm (F) until lip contacts vacumeter link. On 1956 models one point rich. Eckler's Premier Quality Products 57132129 Chevy Carburetor Rebuild Kit Carter WCFB Replacement Kit Includes All Gaskets, Seals, Check Balls, Springs, Accelerator Pump & Needle Valve Read more CARTER 4 Barrel WCFB DUAL CARBURETOR KITS & FUEL FILTERS 1961-65 CHEVROLET 1955-56 DESOTO April 18, 2018 Carter Carburetors Rebuild Kits If the secondary throttle plate is staying open, then check the primary shaft dog and spring. Ethanol gas does not have much if any lubrication. Check throttle linkage to make sure that primary throttle valves come to full wide open position. The mixture screw may be bent, or damaged. In this video we are going to show you how to do the various adjustments on both the Air Bled and the Solid Fuel type of BBD carburetors. Carter WCFB Carburetor E-Manual Download eWCFB, The file is in PDF format, you can download and save/print a copy, FREE to our customers that buy a rebuild kit. With the thermostatic coil housing gasket and baffle plate removed, crack throttle valve and hold choke valve closed. We use a small bottle type of brush and spray silicon spray into the cylinder while we clean. The WCFB carburetor which came on some of the earliest One caveatits my impression that the float bowl is full because when I disconnect the fuel supply line from fuel pump (to card), it has pressure on the line. Adjust idle screws D to produce a smooth idle of correct speed is obtained. Access our free Idle Speed and Mixture Repair Guide for Chevrolet Corvette 1963-1982 through AutoZone Rewards. Carter WCFB Carburetor Catalog Free WCFB Carburetor Manuals These manuals contain specifications, parts lists and instructions.The manuals can also be used to help identify those carburetors without tags. Check to see that slots in air cleaner gasket line up with vent tubes and do not rotate gasket during installation of air cleaner. pump rod until the top of the pump arm is horizontal (or the screw that retrains it is perfectly vertical, if you prefer). One is in the secondary venturi and the other just above the throttle plate. You cannot go wrong with Mikes carburetor in any way. Can't find the answer you're looking for? These manuals contain specifications, parts lists and instructions.The manuals can also be used to help identify those carburetors without tags. There should now be 9/64 clearance between upper edge of choke valve and inner wall of air horn. When removing valves they should be marked so that they get put back the same way. Can you help me out? Enter Carb Number. Technical Details. The main body is partitioned into two compartments (primary and secondary), each containing a double pontoon float and lever assembly and a needle valve and seat. They are not meant to fill the hole, only to restrict it. Air Bled has the venturi tube pointing down into the bore. BBS) and were basically an on/off condition similar to the function of a power valve. Good quality print. Measure float height as illustrated above. There should be a retainer keeping the check ball in place. The metering rods must be installed after the pump adjustment or when leaner than standard rods are installed. Carter WCFB 4 Barrel Carburetor Float System. Adjust by bending float arms, making sure both pontoons on each float are the same height. Correct by removing any burrs or nicks. When the engine gets hot and then is shut off, gas can sometimes overheat and then boil. Change the choke setting to index. Place the choke housing toward the left and remove upper right main body to throttle body screw. 1955 Cadillac Idle Air Mixture Circuit WCFB Carburetor Cutting Out on Left Hand Turn The Carter WCFB and AFB designs fit easily beneath the low profile C1 and C2 hoods. This restricts the flow of fuel. Check the low speed jets to make sure they are clear (#44). The correct way is to use a fuel pump pressure gauge. Back out throttle lever set screw until throttle valves seat in bores of carburetor. This eliminates any bog or hesitation when acceleration. Kit looked complete but I ordered the wrong one based on the pump and of course with it being opened, it cannot be returned. Put some fluid in theaccelerator pumpwell and press down on the pump. The accelerator pump is used to provide an extra squirt of fuel when you step on the gas. He only had 5-years of formal education and in 1909, he founded the Carter Carburetor Manufacturing Co in St. Louis. This is an electronic rebuild manual, no physical copy will be provided. Master Technician Tool Set (early, circa 1935, for 1923~1935 Carter carburetors all makes - most tools then current) Carter Master Technician Tool Set about 1951. but if it runs well you don't really need to make any adjustments. The download link will expire in 30 days. Carter WCFB Fast Idle With carburetor installed and engine warmed up. Test the fuel pump to be sure it isnt putting out too much pressure. They are staked in the hole. Carter WCFB Rebuild Kit Selection Carter WCFB Build Sheets Carter WCFB Adjustments Carter WCFB 4 Barrel Carburetor Float System Carter WCFB Accelerator Pump BY CARB TYPE GENERAL TROUBLESHOOTING FAQs INJECTORS PURCHASE PARTS MANUALS BLOG Carter WGD Adjustments Float Level With bowl cover assembly inverted and float resting on pin in seated needle, and with gasket removed, the distance from the bowl cover to the top of float should be 7/64. Can't find the answer you're looking for. 1956 Chevrolet Corvette & Super Power Kit Engine Idle Speed, Idle Mixture and Throttle Linkage Adjustment Procedure. Ideas?? Other than that, great company to deal with. 1957 Desoto Adventurer Loose Throttle Lever Rear Carburetor. Someone has installed it improperly. How to clean the Jeep Carter BBD carb Idle jets - Duration: 7:14. New fuel pumps are especially suspect. 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 seat. Fast Idle or Idle at Cold Start has to be One of the More Important Adjustments on the Carburetor. Disassembly2. 2: Carter AFB idle mixture and speed adjustment screws. Check any vents to make sure they are open. This is percolation. If the fuel bowl is not filling up enough to fill the pump well, then look at a sticking float needle. Solid fuel has the 2 tubes pointing up. Secondarys are somehow stuck open (which amounts to a vacuum leak). Founded by William Carter in 1909, the Carter Carburetor Company produced units such as the AVS, AFB and 385-CFM WCFB for dozens of years. There may be a blockage in the accelerator pump circuit which would also make it hard to pump.What is the carburetor number so we can make sure you have the correct pump?Polish the pump well with crocus cloth. 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. Coat threads of screw with sealing compound and install it. Float adjusted wrong check float level.Float leaking heat up some water and immerse the float. Carter used metering rods with a single step, 2-step, 3-step, and 4-step. The main body is partitioned into two compartments (primary and secondary), each containing a double pontoon float and lever assembly and a needle valve and seat. If not, then find the check ball and make sure it is loose. Make sure these are clear if you have percolation problems. I rebuilt a Carter WCFB carburetor with the lower auto choke setup. Some models have a pump relief check in the bottom of the fuel bowl. The well should fill with fluid. Carter WCFB 4 Barrel Carburetor Float System. Back out the throttle lever set screw (idle screw) to allow throttle valves to seat in the bores of the carburetor. 1956 Plymouth, Powerflite Transmission Dashpot, 1955 Pontiac Loading or Carburetor Flooding, 1956 Pontiac Hard Starting, Partially Warm Engine. FREE to our customers that buy a rebuild kit. The cfm of the Carter WCFB four-barrel carburetor is approximately 400. Fig. Measure from center top surface of pontoons to air horn. The Solid fuel is the later models BBDContents:00:00 intro00:34 air bled adjustments00:37 air bled float setting01:03 air bled fast idle type I01:25 air bled fast idle type II01:42 air bled fast idle type III01:58 air bled unloader02:24 air bled choke vacuum kick03:01 air bled automatic choke03:16 air bled pump04:08 air bled dashpot04:27 air bled idle speed \u0026 mixture04:58 air bled emission carburetors idle mixture06:00 air bled limiter cap06:36 solid fuel adjustments06:40 solid fuel float setting07:03 solid fuel metering rod07:27 solid fuel accelerator pump07:55 solid fuel bowl vent08:18 solid fuel fast idle cam08:43 solid fuel choke pull-off09:12 solid fuel automatic choke09:24 solid fuel egr dump valve09:46 solid fuel unloader10:08 solid fuel high altitude10:28 solid fuel idle speed \u0026 mixture12:11 solid fuel Limiter cap12:37 solid fuel fst idle12:51 solid fuel throttle positioner13:56 solid fuel vacuum throttle positioner14:31 solid fuel sol-vac15:04 solid fuel dashpot15:28 solid fuel transducer Back out throttle screw so that the throttle valve close completly. Pulloffs : CUFWCFB2 $ 0 . Though fuel float bowl full, cant get gas into the accelerator pump chamber of the carb. *New Float6. If not then clean it and try again. This circuit provides a measured amount of fuel when needed on acceleration until the vacuum and main circuit can take over. How to Adjust a Carter BBD 2 Barrel | It Still Runs The Carter carburetor has been around for a very long time. Can't find the answer you're looking for? In this video I show you how to replace the fast idle spring on the WCFB carburetor. They need to be centered in the bowl.Fuel could be leaking around the needle & seat. Adjusting the WCFB float level & float drop: The main body is partitioned into two compartments (primary and secondary), each containing a double pontoon float and lever assembly and a needle valve and seat. Notice holes from which linkage rods are removed so they can Look for breaks in the new gasket, or cracks around the threaded area.The needle could have been damaged while adjusting the floats. Blow through the intake check passage to be sure the passage is open. Could the float bowl actually be the problem? With choke valve held closed and fast idle adjusting screw C, or fast idle adjusting tang, on high step of cam. Maximum float buoyancy is generally accomplished when the float pontoons are at a 90-degree angle to the fuel valve.

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