If the ignition distributor was not removed from the engine, then the compression stroke of the first cylinder is determined by removing its cover - the rotor contact should be opposite the internal contact of the cover, connected by a wire to the spark plug of the first cylinder. If the ignition distributor (after replacement or repair) just installed on the engine - unscrew the spark plug of the first cylinder. Having closed the hole with a paper plug, rotate the crankshaft. The outgoing air, pushing out the plug, will indicate the beginning of the compression stroke in the first cylinder.
Using a 13 mm wrench, loosen the tightening of the lock plate fastening nut.
We turn the distributor housing clockwise until the breaker contacts close – the lamp goes out.
Slowly turn the distributor housing counterclockwise until the lamp lights up, while slightly pressing the rotor counterclockwise to select the gap in the drive. Holding it in this position, tighten the lock plate nut.
After adjustment, we specify the ignition timing (see Correction of ignition timing angle).