Processing of valve seats in the cylinder head

Valve seats with signs of wear or burning must be processed with the obligatory preservation of angles and chamfers. Otherwise, it is necessary to replace the cylinder head. After any processing of valve seats, it is necessary to grind the valves.

Lapping

The valves should be lapped using only fine-grained polishing paste.

Lubricate the surface of the valve seat with a small amount of paste and install the valve in the appropriate seat. Firmly press the rubber suction cup against the valve plate and rotate the valve in one direction or the other.

After the end of the lapping process, thoroughly clean all parts from dirt and paste and check the valve seat and disc. A solid opaque ring should be visible on both parts, which indicates the width of the valve chamfer.