Location of ignition timing marks
1 – TDC mark on the crankshaft pulley;
2 – 10° ignition advance mark;
3 – 5° ignition advance mark;
4 – 0° ignition advance mark
To check the ignition timing, there are three marks 2, 3 and 4 on the timing mechanism cover and mark 1 on the crankshaft pulley, corresponding to the TDC of the piston in the first and fourth cylinders when aligned with mark 4 on the cover.
The initial ignition timing angles for different engines and gasolines used are indicated in subsection 14.4.
Examination
1. You can check and set the ignition timing using a stroboscope, following these steps.
2. 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.
3. Mark mark 1 with chalk for better visibility (see Fig. Location of ignition timing marks) on the crankshaft pulley. Start the engine and warm it up so that it runs at minimum idle speed.
4. Direct the flashing beam of the strobe light at the pulley and check if the position of the pulley mark 1 corresponds to the data subsection 14.4.
If you have a diagnostic stand with an oscilloscope, you can also easily check the ignition timing using it, following the instructions for the stand.
Adjustment
1. To adjust the ignition timing, stop the engine, loosen the distributor mounting nut and turn it to the required angle.
2. To increase the ignition timing angle, the distributor housing should be turned counterclockwise, and to decrease it, clockwise.
3. Then check the ignition timing again.
Installation
1. Install the ignition distributor removed from the engine in place in the following order.
2. Remove the cover from the ignition distributor, check and, if necessary, adjust the gap between the breaker contacts.
3. Turn the crankshaft until the compression stroke in the first cylinder begins, and then, continuing to turn the crankshaft, align mark 1 with mark 3.
4. Turn the rotor to a position where its outer contact is directed towards the contact of the first cylinder on the distributor cap.
5. While holding the distributor shaft from turning, insert it into the socket on the cylinder block so that the centerline through the spring clips is approximately parallel to the centerline of the engine.
6. Secure the distributor to the cylinder block, install the cover, connect the wires, check and adjust the ignition timing.