Adjust the idle speed

Setting the carburetor must be done on a well warmed engine. If the configuration is done on a cold engine, you can expect it to change for the worse after a full warm-up motor. Reliability is measured for a period of repair without problems operating the carburetor. Adjust the idle speed is disconnected when the crankcase ventilation tube. It is necessary to eliminate the effect of crankcase gases in the working mixture. Using the analyzer - desirable but not necessary. In this section we consider reliable, time-tested methods of adjusting the carburetor without the analyzer. The principle of idle adjustment is practically the same for most carburetors. At any carb mixture screw and a screw quantity. Rotate the screw of quality, we change the section of the opening through which fuel enters the engine with a little air. Rotate the screw number, we change the section of the opening through which air enters the engine with a little gasoline. Regulate the quality of the screw to a greater degree of mixture, and screw the number - to a greater extent the value of engine speed. On some carburetors screw air quality changes a section of a jet idling. In these carburetors this screw at the top of the carburetor - ("Kayhin", "Pirburg") and this means that the adjustment is made by air. When the mixture screw is at the very bottom of the carburetor - it means a standard version control on gasoline. The difference between these options is that when tightening the screws on the system of quality control in the air - fuel mixture is enriched. When tightening the screws on the quality control system for gasoline - fuel mixture is depleted. Zhigulevsky carb "Ozone" belongs to the standard version of the regulation on gasoline. But in the middle of the carburetor by a metal seal is in the air adjustment screw. This design extends the range of adjustments a lot of idling. For the manual to adjust the idle speed, we will use Zhigulevsky "Ozone". At the bottom of the carburetor there are two adjustment screws. One is located at the corner of the bottom of the battery. This mixture screw. The screw of the right wing is looking at the car. Between these screws is a vacuum tube, which connects the vacuum regulator ignition timing on the distributor. Before adjusting the carburetor to remove the tube from the regulator lead and remove the throttle pedal thrust. When operating the engine at idle speed to ensure that no vacuum in the tube going to the control timing. This can be done by connecting to the tube vacuum gauge or the tip of his tongue. The vacuum in the tube should occur only after a light throttle opening of the first chamber and completely disappear after the closing of the damper. If the vacuum does not disappear after the closing of the throttle, this means that there is complete closure of valve noise. The reason for this may be wrong restrictive set screw sticking axis damper is not fully retracted handle air damper control, etc. Before adjusting the need to set the throttle of the first chamber. Possible that the vacuum in the tube does not appear at any position of the throttle. That means pollution of the holes in the carburetor, and then not do without dismantling and cleaning. After troubleshooting can begin to adjust. Screw the quality of work as a petrol tap. Tightening the screws impoverishes the quality of the mixture. Untwisting - enriches the mixture. Poor mixture - a little gasoline. A rich mixture - a lot of gasoline. Changes in the composition of the working mixture affects the very stability of the engine speed. You can experiment by turning the screw through the entire range of adjustment. When tightening the screw revs down and become unstable. At the outlet of the muffler can hear occasional pops. Further tightening may lead to a complete stop the engine. Here is the process of impoverishment of the mixture to a serviceable carburettor. But we do not tighten the screw to a complete stop the engine. Begin to unscrew the screw. Engine speed increases smoothly and at the same time to stabilize. At the outlet of the muffler will not hear of frequent, random claps. Sound of the engine is smooth and begins to sizzle carburetor. So defective carburetor reacts during the transition from lean to normal. Further results in untwisting the screw pereobogascheniyu working mixture. Engine speed is gradually reduced and become unstable. But this is already happening on pereobogascheniya. To restore the normal composition of the mixture to again tighten the screw to stabilize the maximum engine speed. When turning in an engine to listen. Any background noise can interfere with tuning. It is impossible to quickly turn the screw as the motor responds to every quarter-turn screws just a second. Screw number is used to set the amount of idle. For zhigulevskogo motor, this value is 750 - 850 rev / min. After each rotation of the screw number to check the mixture screw. The most economic regulation is on the border between normal and poor composition of the mixture. The number of idle speed must not exceed the specified limits. Mixture screw is in the best possible condition and twisted at the same time there is a smooth running engine. The vacuum in the tube to the regulator ignition occurs only after a light throttle. Described above, the ideal adjustment of the carburetor on the principle of serviceable motor reactions to rotation of the screw. But due to various faults occur, the variation in which it is impossible to detect or poor, or normal or rich mixture. If the rotation of the adjustment screws do not lead to an improvement of the engine, it does not make sense to suffer for a long time. Defective carburetor adjusted very easily. There are some common faults that are repeated too often: 1. The entire range of rotation of the screw quality most stable motor operation is achieved with the full tightening of the screw. On the good carb screw in this position the motor should stall. This means that the full range of adjustments, "rich," "normal," "poor," we can install only the "rich" and the beginning of a 'normal' mix. Switch off the engine fully tightening the screw of quality - is impossible. The reason for this may be: - Air pollution idling jet - jet fuel increased size of idling - not curled all the way to a main jet idling - not completely closed throttle first and second chambers; - broken diaphragm Efficiencies. (On the carburetor, "Ozone" no economizer. This problem can happen on other carburetors.) If, after eliminating all possible problems could not impoverish the working mixture, then you can use the trimmer screw top, which adds air to the system idling. We remind you that this screw is located under a metal seal. 2. In the range adjustment screw quality is not "rich" and "normal" mix, but only a "poor". Motor runs unstable, shaking, often deaf. The car moves only by suction. The reason is often the main jet clogged idle. Small debris falling into the hole jet, can be partially or completely block the passage of gasoline. This failure may be accompanied by dripping gasoline on the throttle of the first chamber and the absence of the characteristic hiss of air. In addition to debris in the jet fuel is necessary to check the size of the hole state gaskets under the carburetor, carburetor nuts and intake manifold. Under Zhiguli carburetor on the intake manifold must be the drain pipe to drain excess gasoline. If it is lost or broken off, that due to air suction can be problems with idling. Screw the quality and quantity should be O-rings from the petrol-resistant rubber. Check the leak in these areas can put his finger to the holes in which these screws. If no rings or they are worn out, the finger will stick to these holes. O-rings on the adjustment screws also serve to lock the screw to prevent inadvertent rotation. If the rings are worn, the screw may twist the vibration motor, which leads to the impoverishment of the mixture. When installed on the carburetor idle speed solenoid valve, the reason for the lack of stable work of the motor may be a leakage of the valve body or broken power cable. Sometimes the cause lean on the old carburetors can be external crack channel idle at the junction of the channel with the bottom of the carburetor. The cause unstable idle speed can be heavy wear on the axis of the throttle. When testing the effectiveness of seals, you can use a disposable syringe with a volume of 20 ml. and fine needle. Fill the syringe with gasoline to drip on suspected sites in the carburetor low engine speeds. If the dripping of gasoline leads to a drastic change in speed, then this place is sucking air. The method described above and adjust the many reasons for failure fully suitable not only for Zhiguli carbs but to all others like him on the design. On the German carburetors "Pirburg" and some others have a vacuum tube to supply a constant vacuum to the system of air heating. The latter is in the air filter housing. The practice of repairs showed that in addition to its primary role of this system can be used for very fine tuning the idle speed without using the gas analyzer. Rather, we use only a rubber tube, connected at one end to the carburetor. In the process of adjusting the idle speed when removing the air cleaner housing, this tube should be toned down. After adjusting to remove the cap and closely monitor the engine speed. Depending on how the adjustment was completed, the reaction of the engine on the removal of plugs will be different: the work of the engine immediately became unstable, the engine shakes, is about to stall. After closing the cap turns are stabilized, the engine is running smoothly again. This is a sign of a poor mix. after removing the cap idle did not change but the motor starts small shudder. Fever lasts as long as not to close the cover. After the closing - the motor runs smoothly. This is a sign of normal composition of the working mixture. after removing the cap turnover rose sharply, as if someone pressed the gas pedal. The motor runs smoothly but the pace has increased compared with those who were at the closed end cap. This is a sign of a rich mixture. Each time after turning in an mixture we have to check your adjustment, opening and closing the vacuum tube system for heating the air. To make sure you can screw a few times to set the quality poor, normal and rich mixture. The most economical option settings will be the smallest change in the engine when removing the plug from the vacuum tube system for heating the air. This method of control was tested many times on the expensive, well-tuned analyzers and the results were always the best settings. In addition to carbs "Pirburg" This method is suitable for setting cars "Ford Serra" with the carburetor, "Weber" and "Motorkraft." Only a vacuum tube system for heating the air is on the intake manifold. In Japanese carburetor settings for this handset can be used for supplying vacuum from the intake manifold to the system of temperature compensation of idling. Last located in the air cleaner housing. Next site on the text for brevity: Option A - adjustment of the motor response to rotation of the screw. Option B - control of the motor response to the removal of plugs.