To complete the work you need:
- valve grinding tool;
- lapping paste.
Sequence of execution
1. Remove the cylinder head (see "Cylinder head - removal and installation").
Advice: If the cylinder head is removed for one reason or another, check the valves for leaks and, if necessary, grind them.
2. To check the tightness of the cylinder head valves, place it on a horizontal surface with the mating surface facing up.
3. Fill the combustion chambers of the cylinder head with kerosene and wait a few minutes. If the kerosene level in any chamber decreases, one or both valves are leaky.
4. Remove the oil seal from the valve (see "Valve stem seals - replacement").
5. Remove the valve from the guide bushing.
6. Apply lapping paste to the working edge of the valve.
7. Install the valve into the cylinder head and attach the valve grinding tool to its rod.
8. Pressing the valve to the seat, turn it from side to side. After 10-15 movements, turn the valve 90° and continue grinding.
9. We grind until a uniform ring-shaped rim is formed on the valve plate...
...and his saddle.
10. Remove any remaining lapping paste from the valve and its seat.
11. We grind the remaining valves in the same way.
12. Install the valve and the new oil seal in the reverse order of removal.
Recommendation: After grinding, check the valves for leaks (see above p. 3) and, if necessary, repeat the grinding.