What should I do if the valve clearance is too large?

Reasons for excessive valve clearance: 1, excessive valve clearance is mainly caused by wear or improper assembly and adjustment of some parts; 2. Some abnormal noises still indicate that the engine may be accidentally damaged. If the engine has abnormal sound, it should be repaired in time to prevent the fault from expanding; 3. Before disassembly, check and preliminarily determine the fault location, and then analyze the abnormal sound characteristics of the engine. It can basically diagnose the position, cause and degree of abnormal sound, and avoid the blindness of decomposition inspection.