weber carburettor problems
http://www.redlineweber.com/html/Tech/3 unning.htm, https://www.youtube.com/watch?v=XIw--72EKU0. 2023 Motorsport Marketing. Viton tip on the needle & seat may be damaged by ethanol, or has dirt in it keeping it open too much. Check for a worn throttle shaft. There is only one original Weber and that is the European produced, Italian designed, carburetor built in Spain. I have an electric pusher fuel pump right below the. Other possible causes of a rough idle include a defective charcoal canister purge control valve that is not closing and is leaking fuel vapors back into the carburetor, excessive compression blowby (worn rings or cylinders), weak or broken valve springs, or ignition misfiring due to worn or dirty spark plugs, bad plug wires or a weak ignition coil. | You should see a jet of fuel squirt into each of the front venturis (barrels) of the carburetor. The carburetor may flood if dirt enters the needle valve and prevents it from closing. Webcon operate a Global distribution chain via a long established network of Dealers and specialists, many of whom are located in the EU. Cleaning and rebuilding an older one or two barrel carburetor is a relatively simple job. pl521sss, Certain companies have no affiliation (other than maintaining licensing and manufacturing agreements with Magneti Marelli) with the Italian designed and Spanish built Weber carburetors. It is interesting to note that at Magneti Marelli's website the founding of the Weber carburetor was to eliminate having to buy carburetors from the French Solex carburetor company. Most of those can be overcome by rebuilding the carburetor, cleaning out the trash, or minor adjustments. Black, or sooty means too rich, reduce the jets by .002. Now, say we punch a pin hole in the straw. The hole in the base casting can become worn over time, allowing air to be sucked in past the shaft. Display as a link instead, I have a major carb hesitation on this cold weather. Was GM hiding something from the public if they did not disclose that the Cadillac they were buying was really an Opel? In the 1930s, Weber began producing twin-barrel carburetors for motor racing, where two barrels of the same size were used. Floats are not part of a rebuild kit, so if new gaskets are also needed, a rebuild kit will have to be purchased, too. Eduardo Weber began his automotive career working for Fiat, first at their Turin plant (in 1914) and later at a dealership in Bologna. Ours does and it's very common for fuel filters to plug up causing grief with carbs. REDLINE's use of the European WEBERS assures the consumer they are receiving the same high quality genuine WEBER carburetor that has gone into the conversion kits for over 30 years. Make sure the ignition system is up to par. Well, forget that silly notion, the jets have nothing to do with it. Works great. How did the dirt get there? The accelerator pump linkage or cam usually has several adjustment settings, so try the next higher setting if it needs more fuel. Car overheating can be caused by low coolant, a faulty radiator fans, a broken serpentine belt, or a stuck thermostat. This valve has two circuits; an idle circuit and an off-idle circuit. Stop driving an overheated car. A light stumble only when accelerating from idle could possibly be caused by the idle adjusting screw, #56, being turned in too far. * Do a compression test..If the compression is off by more than 10% per hole you will have a really bad time tuning the carbs. While there where competitors, there was one undisputed leader - Weber of Italy. I want to keep as much of that corn syrup out of my carbs and fuel system as possible if it sits for any length of time. Replacement carburetors are expensive, and may cost from $200 to $600 or more depending on the application and type of carburetor. I checked for vac leaks, none that I can tell. Can't find the answer you're looking for? I would recommend an electric fuel pump over the rubber bulb pump. It mixes gas from the float bowl with air passing through the throat in a precise ratio, and if that fuel/air ratio is off, you're going to have problems.Far and away the most common problem carb problem is clogged pilot jets. I have a weber on my shelf that I am about to install, and this info is great to have. Check them before the carb is installed. Tweak the idle mixture screws again at this speed. This is a problem that is usually (but not always) the carburetor's fault. In the case of GM they needed a nice midsized vehicle and the Opel was easy to brand a Cadillac. All settings are done with choke disengaged or warmed up so that the choke is fully opened and disengaged. This is a much debated topic, but mostly among those selling what can only be described as a "Similar" carburetor. The butterflies should close completely, but rather softly with only a soft click, not slam shut like a rat trap. If backing it out as much as 1/4 turn doesn't cure it the problem is in the accelerator pump circuit. That check valve keeps the metering well full of gas at a level above that in the float bowl and ready for an immediate squirt through the jets upon acceleration. Most likely they will be too thin to match the intake and in that case you'll have to weld on some tabs or make up some step washers to even up the clamping pressures of the original flange washers and nuts. Pasted as rich text. Double check all the fuel line, vacuum and emission hose connections, the throttle linkage and return spring, then start the engine. The install took about 15 minutes and solved the problem. The install took about 15 minutes and solved the problem. JVc2CGfwXKDPjTQtQT79rHnpNz1iKiD086G4c2fOWXHSjR9JZpFjmNn3QomOxpPm. How to Diagnose & Repair Carburetor Problem - AA1Car.com If the diaphragm has failed or the valve is clogged with dirt or fuel varnish deposits, it must be replaced. One of the first symptoms commonly associated with a bad or failing carburetor is a reduced engine performance. Pump gas now has a bunch of ethanol in it and it starts to go bad and gum up in just a matter of weeks, so if youre not riding your bike regularly you can save yourself a lot of trouble by adding a fuel stabilizer to keep the gas from degrading.There is one other thing that can cause a lean condition at idle, and thats an air leak. This action forces gas through a passage into the bottom of the metering well which is the passage part #82 screws into. Also check for dirt or other foreign matter in the needle and seat.<br /> 6. If you're using an early exhaust manifold the regular stock manifold gasket will work fine, just be sure to install it with the metal side facing the manifolds. Back it out 1/8 to 1/4 turn and try it again. So if it develops any sort of issue, it can throw off this mixture and affect engine performance. And now thinking if the jets are incorrect but according to this write up, it may not be the problem. Licensing in some cases means they can use the WEBER name and the WEBER mark to brand a product that otherwise would not be recognized as a WEBER. The motor may have failed because a vacuum leak caused it to overtax itself in a vain attempt to compensate for the unwanted air. Gasket sealer may be applied to the base gasket to reduce the chance of air leakage, but do NOT use RTV silicone because it dissolves when exposed to gasoline. As engine load increases and the throttle opens wider, intake vacuum drops. IMPORTANT TECHNICAL ARTICLE.Jetting and Tuning Weber Carbs. If that's the case, the dizzy is getting advance at idle, then as you crack the throttle open, it gets less vac and the dizzy loses adv, retarding the timing. Your link has been automatically embedded. When reconnecting the fuel line and any other fittings (EGR, PCV) to the carburetor, be careful not to cross-thread the fittings, and do NOT over-tighten as doing so can strip the treads in the soft casting. While they are no longer standard, carburetors are still found on many road going cars and trucks, and are very important to the drivability and performance of the vehicles equipped with them. ALWAYS: Use new hose clamps on fuel hoses. In order to install any Weber kit you'll have to also have an early exhaust manifold or an exhaust header. I removed the electric choke assembly cause the mechanism is screwed up that connects with the throttle lever itself. Replacing or rebuilding the carburetor wouldn't solve anything because the real culprit is heat. Weber carburetors are sold for both street and off-road use, with the twin-choke sidedraft DCOE (Doppio Corpo Orizzontale E; "Double-Body Horizontal E") being the most common one. Even bad gas can cause hesitation problems. By the mid-1980s, carburetors were history on new production vehicles, having been replaced by throttle body and multiport electronic fuel injection systems. The nice thing about my '73 TR6 is that it's got a primer built into the factory mechanical pump. The choice is simple. When adjusting floats do not put any pressure on the needle. Although, I didnt put a fuel filter after the hard fuel line before the dual carbs. Allow fuel to leak or spill. If the carburetor needs work, it can be rebuilt with a kit or replaced with a new or remanufactured carburetor. Does that mean it is a Cadillac? DO NOT OVERLOOK this as a problem.This is the #1 problem with any Weber carb conversion. The "Similar" carburetors are easily distinguished from the European Weber by several characteristics: I don't care what Weber says there is a lot of variables to make a motor idle. This video goes over some simple cleaning procedures to potentially fix any idle problems and popping you may have. The spring is inside a black plastic choke housing on the top or side of the carburetor. If the engine hesitates or stumbles when accelerating, the accelerator pump linkage or cam may require some adjustment to increase the volume of fuel squirted into the engine when the throttle opens. Your previous content has been restored. Weber Carburetors is an automotive manufacturing company founded in 1923, known for their carburetors . Replace any cracked or missing hoses. Even if the choke is defective, a choke repair kit or a new bimetal spring should be all that's necessary to eliminate the starting problem. CB Performance - Weber Carburetor Kits, Jetting Chart, Replacement The Genuine European Webers have the trademark "W" stamped into the carburetor and are clearly marked with its origin "Made in Spain". Pierce, also a longtime boater, exclaimed that hed never thought of that approach. But this licensing agreement means that a specific company can legally use the Weber name. Flooding may also be caused by excessive heat in some instances. This type of idle problem usually caused by the automatic choke. How does a consumer discern what Genuine really means? We located the bulb beneath the trunk mat to keep things subtle. Ford Mustang V8-5.0L - Vehicle Engine Mechanical Inspection - Houston, Texas. Hesitation is a classic symptom of a lean fuel mixture (too much air, not enough fuel) and can be caused by a dirty or misadjusted carburetor, or one with a weak accelerator pump or worn throttle shafts. Flooding can also be caused by excessive fuel pressure forcing fuel past the needle valve. Hard Cold Starting Problems Hard starting can be caused by a choke that fails to close and causes a rich fuel mixture when the engine is cold. That would indicate a vent problem, or a leaking main discharge. Gas is admitted from the float bowl into the chamber under the accelerator pump diaphragm #36. Replacing the entire carburetor is unnecessary and is the same as replacing the engine because the water pump is bad. While modern vehicles are no longer equipped with carburetors, they are still commonly found on many older road going cars and trucks, as well as classic and show vehicles. Another cause may be a defective ISC motor stuck in the extended (high idle speed) position. I'd then hood it to the vac adv line coming from the carb and see if there's any vac at idle. let the throttle close and don't touch it until you're finished setting the choke. Thank you Jeremy. Did you disconnect the vac line when you set the timing? Some great resources to start with : The *** Weber Carb*** Adjustment Thread Weber carb idle help Weber carb and electric choke The Weber 38 / Fuel Pressure Thread The Weber 38 linkage help with pics thread The Weber vs OEM Thread : located on the 60 thread. A broken choke will also prevent the engine from idling properly (no fast idle while it is warming up) which can cause it to stall until it reaches normal operating temperature. The pump forces gas through a passage to the metering well, up through the check valve, and out the jets. While this void is being filled the throttle butterfly(s) is/are opening, but without an immediate extra shot of gas and the engine hesitates until gas reaches the accelerator jets or the venturi starts sucking gas through the main jet(s). I'm guessing this is on an L16? Weber 38 DGAS : info + settings + tuning | IH8MUD Forum Don't blame the carburetor if the real problem is a lead foot on the accelerator pedal , or the engine has low compression, retarded ignition timing or an exhaust restriction (plugged converter). Feb 10, 2023 To diagnose this condition, the float level needs to be checked and the float weighed to determine if it has become fuel saturated. These carburetors found use in Maserati and Alfa Romeo racing cars. A lean choke is indicated by coughing and sputtering on acceleration when the engine is cold. Replace any hose that is hard, brittle, mushy, cracked or leaking. Do not depend on the factory delivered settings. Turn this screw counterclockwise to decrease the fast idle speed, or clockwise to increase fast idle speed. Say you have a drinking straw standing in a glass of water. Once warm return to idle and adjust the mixture screws to achieve the highest rpm. Never reuse the old gasket because they almost always leak! They should burn tan, or brown. Small adjustments go a long ways, and it may take several trial-and-error adjustments of the choke housing to get it right. What needs to be done here is to reroute the fuel line away from sources of heat (like the exhaust manifold and pipe), and/or to insulate the fuel line by fabricating aheat shield or wrapping the fuel line with insulation. Flat rate pricing based on labor time and parts, Trusted mechanics, rated by thousands of happy car owners, Hand-picked, community-rated professionals, Over 25,000 topics, from beginner tips to technical guides, Check cars for recalls, common issues & maintenance costs, Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance. The tip of the screw rests against a cam that slowly rotates as the choke opens during engine warm up. Any problem with the accelerator pump diaphragm itself will show as a gas leak at the cover #34 and the diaphragm will have to be replaced. The hitachis are a bit easier to tuneor let's say "more forgiving", but I wouldn't toss a band new weber. Other causes may include a defective distributor advance mechanism, a weak ignition coil, carbon tracks on the coil tower or distributor cap, bad plug wires, worn or dirty spark plugs that misfire when the engine is under load, or even an exhaust restriction. They do require adding an oxygen sensor to the exhaust system for feedback fuel mixture control, but most do not require any special computer skills for tuning. Great overall impressions. Another way to spot the "Similar" carburetors is that a lot of them have a black choke element - all of the Redline Webers coming from Europe have a White choke element. I have seen too many aged ones where the rubber starts cracking and eventually leaks. It's pretty stupid how brand new Weber does this. "Scale Plan Series: 1935-37 8C 35, 12C 36 and 12C 37 Alfa Romeos", Exploded views for Weber carburetors, parts, https://en.wikipedia.org/w/index.php?title=Weber_Carburetors&oldid=1153658806, Manufacturing companies established in 1923, Manufacturing companies disestablished in 1992, Articles with unsourced statements from December 2019, Articles with unsourced statements from January 2023, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 7 May 2023, at 15:19. If no fuel squirts out, or the stream is very weak, or only one of the two discharge nozzles on a two-barrel or four-barrel carburetor are working, the accelerator pump circuit has a problem. There are only two direct distributors of Spanish Weber carburetors - Webcon[5] based in the UK and WorldPac known as RedlineWeber[6] in the US. Hard starting is another symptom commonly associated with a bad or failing carburetor. Damage any gasket surfaces. If you're not modifying and tuning the engine to the max, like in serious racing, it doesn't make any difference which you use. This video goes over some simple cleaning procedures to potentially fix any idle problems and popping you may have. See Project 28 for more details on rebuilding the Weber brand of carburetors. HEI ignition Weber fuel pressure regulator AC mech fuel pump Here is what is happening; Per Weber's instructions, the idle speed screw is tightened to just make contact with butterfly linkage (zero lash), and then turned turn, maximum. Tighten the carburetor base mounting nuts or bolts evenly so the gasket is clamped firmly in place. The store bout PCV valves have spring tensions set for a stock motor. Once the RPM starts to drop, turn the screw back out 1/4 turn. But are they Genuine? Before you take a carburetor apart, find an assembly diagram in a service manual for reference. If the carburetor has worn throttle shafts that are leaking air, or any of the castings are cracked, warped or damaged, the carburetor cannot be rebuilt and must be replaced. Further adjustment is usually required when the engine is running, but that will get you started.
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