1. Remove the valve stem seal (see «Oil seals - replacement»).
2. Remove the valve from the guide sleeve.
3. Apply lapping paste to the working edge of the valve.
4. We install the valve in the head of the block and fix the device for lapping the valves on its stem.
5. Pressing the valve against the seat, turn it from side to side. After 10-15 strokes turn the valve 90°and continue lapping.
6. Lapping is carried out until a uniform annular rim is formed on the valve disc...
...and his saddle.
7. Remove the remnants of lapping paste from the valve and its seat.
8. Install the valve in place in the reverse order of removal.
Recommendation. When assembling, install new valve stem seals.
9. Similarly, we grind the remaining valves.