Setting the ignition timing (VAZ-21213)

The ignition timing angle before TDC at a crankshaft speed of 750-800 min⁻¹ must correspond to the data Appendix 3.

To check the ignition timing, there are three marks 1, 2 and 3 (Fig. 7-18) on the timing mechanism cover and mark 4 on the crankshaft pulley, corresponding to the TDC of the piston in the first and fourth cylinders when aligned with mark 1 on the cover.



You can check and set the ignition timing using a stroboscope, following these steps:

• connect the positive clamp of the stroboscope to the positive terminal of the battery, the ground clamp to the negative terminal of the battery, and connect the clamp of the stroboscope sensor to the high-voltage wire of the 1st cylinder. Mark mark 4 on the crankshaft pulley with chalk for better visibility;
• start the engine and point the flashing beam of the strobe light at the mark on the pulley; if the ignition timing is set correctly, then when the engine is idling, the position of mark 4 on the pulley should correspond to the data in Appendix 3.

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To adjust the ignition timing, stop the engine, loosen the ignition distributor mounting nut and turn it to the required angle. To increase the ignition timing advance angle, turn the distributor housing counterclockwise, and to decrease it, turn it clockwise. Then check the ignition timing again.

For ease of adjustment of the ignition timing, there are divisions and signs "+" and "-" on the flange of the ignition distributor sensor. One division on the flange corresponds to eight degrees of crankshaft rotation.

If you have a diagnostic stand with an oscilloscope, you can also easily check the ignition timing using it, following the stand's operating instructions.

Install the ignition distributor sensor removed from the engine in place in the following order:

• turn the crankshaft until the compression stroke in the first cylinder begins, and then, continuing to turn the crankshaft, align mark 4 with mark 3;
• remove the cover from the ignition distributor and turn the rotor to a position where its outer contact is directed towards the contact of the first cylinder on the cover of the distributor;
• holding the shaft of the distributor sensor from turning, insert it into the socket on the cylinder block so that the center line passing through the spring latches is approximately parallel to the center line of the engine;
• attach the distributor sensor to the cylinder block, install the cover, connect the wires, check and adjust the ignition timing.