OCR Text |
Show Valve Grinding. In cases where a badly pitted valve requires grinding, there 'is a short-cut. Cut a piece of emery-cloth in dimensions a little bit wider than the valve seating seat-ing and twice as long and then double it over so that both surfaces are cutting cut-ting surfaces. Next cut a hole Mi the cloth so that the valve stem mav be passed through and the emery-cloth brought close up against the valve head. The valve is then placed in position for grinding under comparatively high pressure. Both sides of the emery-cloth will conform to the valve head and the seating, and if the valve turns and the emery-cloth remains stationary, the valve will be ground on the" upper emery, whereas, if the cloth revolves, the valve seating will be ground on the lower emery. |