1. We prepare the car for operations (see "Vehicle preparation for maintenance and repair").
2. Remove the cylinder head cover (see "Cylinder head cover gasket - replacement").
3. We check and, if necessary, adjust the tension of the timing chain drive (see "Timing Chain - Tension Adjustment").
4. Remove the cover of the ignition distributor (see "Ignition timing - check and adjustment")
5. Set the camshaft to the BMT position of the compression stroke of the 4th cylinder. To do this, a special key at 38 mm turn the crankshaft until the mark on the camshaft sprocket matches the protrusion on the bearing housing.
In this case, the mark on the crankshaft pulley must match the mark on the camshaft drive cover of the carburetor engine.
On an injection engine, the marks have a different shape.
In this position, we adjust the gaps at the intake and exhaust valves of the 4th (8th cam and 7th cam) cylinder, as well as the exhaust valve of the 2nd (4th cam) and inlet valve 3rd (6th cam) cylinders. We count the cams from the camshaft sprocket.
6. We insert a probe 0.15 mm thick between the lever and the camshaft cam. With the correct gap, the probe should enter with a slight pinch. Otherwise, adjust the gap.
7. Key by 17 mm Loosen the adjusting bolt locknut.
8. Insert the probe and key by 13 mm turn the adjusting bolt to achieve the required clearance.
9. We take out the probe. While holding the adjusting bolt with a wrench, tighten the lock nut with a second wrench. Usually, the adjusting bolt rises slightly, reducing the set gap. Repeat the adjustment if necessary.
10. Turn the crankshaft 360°. In this case, the camshaft and the ignition distributor slider will turn 180°.
11. Similarly, we adjust the clearances at the intake valve of the 2nd cylinder (3rd cam) and exhaust valve of the 3rd cylinder (5th cam), as well as inlet (2nd cam) and graduation (1st cam) valves of the 1st cylinder.
12. Installation of all removed parts is carried out in reverse order.