What is the valve clearance of Chevrolet Cheng Jing 1.8?

Cold state 0. 18-0.20, hot state 0.20-0.22 (unit: mm).

When the engine is working, the valve will expand due to the increase of temperature. If there is no gap between the valve and its transmission parts in the cold state or the gap is too small, then the thermal expansion of the valve and its transmission parts in the hot state will inevitably lead to the untidy closing of the valve, resulting in air leakage in the compression stroke and power stroke of the engine, thus reducing the power and even making it difficult to start. In order to eliminate this phenomenon, when the engine is assembled in cold state, a certain gap is usually left in the valve and its transmission mechanism to compensate for the expansion of the valve after heating. This clearance is called valve clearance.