To check the ignition timing on the car there is a scale 1 (figure 52) in the clutch housing hatch and mark 2 on the flywheel. One division of the scale corresponds to 1° of crankshaft rotation. When the mark on the flywheel is aligned with the middle (long) division of the scale, the pistons of the 1st and 4th cylinders are at TDC. When running the engine on a stand, the ignition timing can be set using mark 3 (figure 53) on the crankshaft pulley and marks on the front toothed belt cover. Mark 1 corresponds to the ignition advance of 5 and mark 2 to the TDC position of the pistons of the 1st and 4th cylinders.
Figure 52. Mark on the flywheel and scale on the clutch housing for setting the ignition timing
Figure 53. Timing marks located on the crankshaft pulley and front timing belt cover
Check and set the ignition timing using a stroboscope, acting in the following order. Connect the stroboscope's "plus" clamp to the "plus" terminal, the ground clamp to the "minus" terminal of the storage battery, and connect the stroboscope sensor clamp to the high-voltage wire of the 1st cylinder. Start the engine and direct the flashing light of the stroboscope into the clutch housing hatch. If the ignition timing is set correctly, then at idle speed the mark on the flywheel should be one division short of the middle division of the scale 1 (see figure 52).
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To adjust the ignition timing, stop the engine, loosen the ignition distributor mounting nuts and turn it to the required angle. To increase the ignition timing advance angle, turn the distributor housing clockwise, and to decrease it, turn it counterclockwise (if you look from the side of the ignition distributor cover). Tighten the mounting nuts and check the ignition timing again.
For ease of adjustment of the ignition timing, there are divisions and signs "+" and "-" on the flange of the sensor-distributor, and on the body of the auxiliary units there is an installation protrusion (see figure 34). One division on the flange corresponds to approximately five degrees of crankshaft rotation.