What is the fear of "lack" in car maintenance? Tell me in detail?

During vehicle maintenance, some small parts may be omitted due to negligence, and some people even think that it doesn't matter whether they are installed or not, which is

very dangerous and harmful. Engine valve keys should be installed in pairs. If they are missing or missing, the valve will be out of control and the plug will be damaged. Anti-loosening devices such as cotter pin, locking screw, safety < P > piece or spring pad installed on engine connecting rod bolt, flywheel bolt and transmission shaft bolt may lead to serious failure in use; Once the oil nozzle used to lubricate the gear in the wheel chamber of engine timing gear < P > is missing, it will lead to serious oil leakage and low engine oil pressure.

The loss of the water tank cover, the oil cap and the oil tank cover will cause sand and dust to invade and aggravate the wear of various parts.