To do the job you need:
- valve grinding tool;
- rubbing paste.
Execution sequence
1. Remove the cylinder head (see "Cylinder head - removal and installation").
Tip: If the cylinder head is removed for one reason or another, check the tightness of the valves and, if necessary, grind them.
2. To check the tightness of the valves of the block head, lay it on a horizontal surface with the mating plane up.
3. We fill the combustion chambers of the block head with kerosene and wait a few minutes. If the level of kerosene in any chamber drops, one or both valves are leaking.
4. Remove the valve stem seal (see "Oil seals - replacement").
5. Remove the valve from the guide sleeve.
6. Apply lapping paste to the working edge of the valve.
7. We install the valve in the head of the block and fix the device for lapping the valves on its stem.
8. Pressing the valve to the seat, turn it from side to side. After 10-15 strokes turn the valve 90°and continue lapping.
9. Lapping is carried out until a uniform annular rim is formed on the valve disc...
...and his saddle.
10. Remove the remnants of lapping paste from the valve and its seat.
11. Similarly, grind the remaining valves.
12. Install the valve and a new valve stem seal in the reverse order of removal.
Recommendation: After lapping, check the tightness of the valves (see point 3 above) and, if necessary, repeat the lapping.