Warm up the engine to normal operating temperature. The operating temperature has been reached when the coolant hose at the bottom of the radiator becomes warm. The oil temperature in a carburetor engine must be at least +60°C, in an engine with an injection system - at least +80°C.
Turn off lights, air conditioning.
Switch off the ignition.
Connect the engine crankshaft speed meter and stroboscope in accordance with their operating instructions.
Attention: With the TSZ-H system, the hose to the vacuum ignition timing controller, depending on the model, is disconnected and plugged or remains connected, see the ignition timing table.
TBZ-H systems. VEZ, KE-Motronic: start the engine and let it idle.
Digifant system (engines with the designation PF, PB, 2E, PG): Disconnect the blue plug from the temperature sensor. The temperature sensor is located on the coolant pipe next to the spark plug tip. Start the engine and set the crankshaft speed equal to 2250±250 1/min by supplying gas.
Direct a flickering strobe light into the clutch housing viewing window (arrow).
Attention: The viewing window is usually covered with a rubber stopper, which should be removed.
Caution: Risk of injury from rotating belt pulley and V-belt.
The ignition is adjusted correctly if, when the strobe flashes, the risk of ignition advance on the flywheel is stationary under the setting mark on the clutch housing.
If the marks do not match, slightly loosen the distributor mounting bolt and turn the ignition distributor until the risk with the value of the corresponding ignition timing is under the installation mark. To turn the distributor with a TSZ system, you can easily tap the vacuum ignition timing with the handle of a wrench.
Tighten the distributor mounting bolt to 25 Nm.
Check idle adjustment.
Then check the ignition timing again.
Remove measuring instruments.
If disconnected, connect vacuum hose to ignition distributor and plug to temperature sensor.
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