Grinding paste

This article or the following section is not adequately provided with supporting documents ( e.g. individual evidence ). Information without sufficient evidence could be removed soon. Please help Wikipedia by researching the information and including good evidence.

Grinding paste or special valve grinding paste is used to repair valves and other closures that are as tight as possible ( steam dome lids in steam locomotives , inlet and outlet valves in combustion engines ). The paste consists of very fine sand and fat. For repairs, the paste is applied to the area between the valve disk and the valve seat insert and then the valve is slowly turned back and forth. As a result, the valve head and valve seat insert are adapted to one another. A suction cup is attached to the valve for rotation . Either a stick or a special attachment for a drill is attached to this. This should also rotate in both directions.