How to adjust the valve of gasoline engine water pump? Please, thank you.

The gasoline engine water pump can adjust the valve clearance to about 0.5cm.

Compared with diesel engine, gasoline engine is lighter, lower in manufacturing cost, lower in noise, better in low-temperature starting, but lower in thermal efficiency and higher in fuel consumption. In order to be light and cheap, two-stroke air-cooled gasoline engines are widely used in low-power power machinery such as motorcycles and chain saws. In order to have simple structure, reliable operation and low cost, most fixed low-power gasoline engines adopt four-stroke water-cooled type. Most cars and light trucks use water-cooled gasoline engines with overhead valves, but with the increasing attention to fuel consumption, diesel engines are widely used in such cars. In order to be light and powerful, the engines used in small aircraft mostly use air-cooled gasoline engines with hemispherical combustion chambers.