Automobile secondary maintenance project 1: engine; The secondary maintenance of automobile needs to test whether the engine idle speed, medium speed and high speed, cylinder pressure and vacuum degree meet the standards. And whether the indexes of the engine after three times of cleaning and filtering meet the specifications. The inspection of this project is more detailed than the first-class maintenance.

Automobile secondary maintenance project 2: clutch; This project is to test the convenience, stability and reliability of clutch operation, to ensure that the clutch is convenient and normal when used, and there is no oil leakage in the hydraulic system. Let the driver use the clutch better.

Automobile secondary maintenance project 3: tires; Check whether the tire pressure is normal, whether the tire tread is mixed with impurities that are easy to hurt the tire, such as gravel, and whether the tire is aging and blistering. Also check whether there is friction between the tires and the trunk floor during normal operation.

Vehicle secondary maintenance item 4: vehicle inspection; This project is to test the overall situation of the car, such as whether there are cracks in the frame, whether the screws are loose, whether the lights are activated, and whether there is abnormal noise when driving. If found, it will be checked, adjusted and eliminated immediately. Ensure that the vehicle runs normally.