1. Remove the oil seal from the valve (see "Valve stem seals - replacement").
2. Remove the valve from the guide sleeve.
3. Apply lapping paste to the working edge of the valve.
4. Install the valve into the cylinder head and attach the valve grinding tool to its stem.
5. Pressing the valve against the seat, turn it from side to side. After 10-15 movements, turn the valve 90° and continue grinding.
6. We grind until a uniform ring-shaped rim is formed on the valve plate...
...and his saddle.
7. Remove any remaining lapping paste from the valve and its seat.
8. Install the valve in place in the reverse order of removal.
For more details, see the page (LADAMAN.ru)
Recommendation. During assembly, we install new oil scraper caps.
9. We grind the remaining valves in the same way.