Pierburg 2V and Weber 2V-TLD carburetors
Since the CO content and the idling speed have a mutual influence on each other, both parameters must be checked and adjusted at the same time.
Attention: The deviation of the CO content by±0.20% and the idling speed by±25 1/min is considered normal.
Prerequisite for testing: The exhaust system must be tested. To do this, with the engine running, cover the exhaust pipe with a rag. All pipe connections must be tight.
Attention: When carrying out the check, make sure that the workplace is sufficiently ventilated. If this is not done, there is a risk of exhaust gas poisoning.
Check the carburetor rods and rollers for gaps. Repair and adjust the carburetor if necessary (service station work).
Warm up the engine and turn off. The lower coolant hose at the radiator should be warm.
Turn off all electrical consumers (radio, windshield wipers, etc.) and air conditioning system.
Check and, if necessary, adjust the ignition timing.
The air filter element must be clean. It is best to perform the adjustment after installing a new replacement air filter element.
In accordance with the operating instructions, connect the crankshaft speed meter and the device for measuring the CO content.
Start the engine warmed up to operating temperature and leave it to idle.
Check the tightness of the intake tract. To do this, circle all the seals in the intake tract with a brush moistened with gasoline. If the crankshaft speed increases for a short time, then there is an additional air leak in the duct. Locate the leak and eliminate the cause.
Caution: Do not inhale gasoline vapors - they are poisonous! Avoid splashes of gasoline on hot parts and parts of the ignition system. Fire hazard!
Run the engine at 3000 rpm for about half a minute, then return to normal idle.
As soon as the readings of the measuring instruments have stabilized, read the measurement results and compare with the prescribed values, see p. 66.
Carburetor Pierburg 2V
If the idle speed deviates from the specified value, turn the adjusting screw -A- until the specified value is reached.
If the CO content deviates from the prescribed value, remove the protective cap from the adjusting screw -B-. To do this, drill a plastic cap in the center, screw a screw or sheet metal screw into the hole and, grabbing the screw with pliers, remove it together with the protective cap. If necessary, remove and then reinstall the air filter.
Carburetor Weber 2V-TLD
If the idling speed deviates from the specified value, turn the adjusting screw -B-. until the prescribed value is reached.
If the CO content deviates from the prescribed value, remove the protective cap from the adjusting screw -A-. To do this, drill a plastic cap in the center, screw a screw or sheet metal screw into the hole and, grabbing the screw with pliers, remove it together with the protective cap. If necessary, remove the air filter to gain access to the protective cap, and then loosely install the air filter for adjustment.
Attention: Do not disconnect the vacuum hoses from the filter housing.
Run the engine at 3000 rpm for about half a minute, then return to normal idle. The CO content will first rise, then fall, and stabilize after about 25 seconds. As soon as the readings of the measuring instruments have stabilized, read the measurement results and compare them with the prescribed values.
By turning the adjusting screw, set the CO content to the prescribed value. If necessary, turn the appropriate adjusting screw to adjust the idle speed.
Attention: Perform the adjustment within 30 seconds after the readings stabilize. Otherwise, make the engine run again at a crankshaft speed of 3000 1/min.
Recheck the idling speed and the CO content.
Install a new protective cap on the CO adjustment screw.
Remove gauges.
Engine with Weber 2V-TLD carburetor: install air filter, see p. 57.
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