In addition, to grind the valves you will need lapping paste and kerosene.
1. Remove the cylinder head (see "Replacing the cylinder head gasket").
2. Remove the valves from the cylinder head and thoroughly clean the valves and seats (see "Disassembly, repair and assembly of the cylinder head").
3. Insert the valve into the cylinder head.
4. Apply a thin layer of lapping paste to the working chamfer of the valve.
(Original publication on the website LadaMan.ru)
5. Secure the valve stem in a valve lapping tool and turn the valve in both directions using the tool, periodically pressing the valve against the seat.
6. An external sign of satisfactory lapping is a uniform matte-gray color of the working chamfer of the valve and seat.
7. After lapping, thoroughly wipe the valve and seat with a clean cloth and rinse to remove any remaining lapping paste. Check the tightness of the valve by installing it in the cylinder head with springs and crackers. Then lay the cylinder head on its side and pour kerosene into the channel that is closed by the valve. If kerosene does not leak into the combustion chamber within 3 minutes, the valve is sealed.