1. Remove carbon deposits from the valves. Check if the stem is deformed and if there are any cracks on the plate; if damaged, replace the valve.
2. Check whether the working chamfer is too worn or damaged. When grinding the working chamfer of the valve on a grinding machine, maintain a chamfer angle of 45°30'±5' and ensure that the thickness of the cylindrical part of the valve plate after grinding is not less than 0.5 mm, and also that the layer of hard alloy fused to the chamfer of the exhaust valve is not removed.
[The text is published on the portal VAZBOOK.RU]