An RPM meter and a stroboscope are required to check and adjust the ignition timing.
Warm up the engine to operating temperature. Operating temperature is reached as soon as the water hose at the bottom of the radiator becomes warm. The oil temperature on a carburetor engine is not less than +60°С, and on an injection engine not less than +80°С.
Turn off lights, air conditioning,
Connect the RPM meter and stroboscope according to their operating instructions.
Attention: Engines 06, 6W (57kw/66kw): Disconnect the vacuum hoses of the vacuum diaphragm from the ignition distributor and close them, see ignition timing table. Pre-mark the hoses for subsequent installation on those fittings.
All engines except for indexes GW of release up to 6.84, DG, MV: Disconnect the connectors of the stabilization system switching unit: idle mode and connect them together.
TSZ-H ignition system (except MV engine): Start the engine and leave it to idle.
Digifant system (engine index MV): Disconnect the blue connector from the temperature sensor. The temperature sensor is located on the cooling system pipe near the spark plug tips. Leave the engine running at 2250±50 rpm.
Aim a stroboscope at the crankshaft pulley and the connection line of both halves of the crankcase.
Caution: Be careful when pulley and belt are rotating.
With a normally set ignition timing, the slot on the pulley, when illuminated with a strobe light, should be opposite the mark on the engine crankcase.
To set the desired ignition timing, slightly loosen the bolt and turn the ignition distributor until the set value is set. To turn the distributor with a transistor ignition system, lightly tap the vacuum diaphragm with a screwdriver.
Tighten the bolt to 25 Nm.
Check idle speed adjustment.
In conclusion, once again check the ignition timing adjustment.
Turn off meters.
Connect the vacuum hose to the ignition distributor and the connector to the temperature sensor.
Connect the connectors of the switching unit of the idle stabilization system.
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