Cylinder of acid corrosion is the electrochemical role of the material damage. When the cylinder wall temperature is low, into the cylinder of water vapor condenses into water droplets will be. These droplets and the role of the combustion gases and acid generation, such as organic acid, sulfuric acid, carbonate, and so on, they will stay in the cylinder walls of the cylinder corrosion. Practice has proved that when the cooling water temperature below 65 ~ 70 ℃, the diesel engine at low temperatures or frequent start-up, corrosion and wear will be increased significantly. So, pay attention to the use of the process of cooling water temperature control to minimize the number of cold start-up trucks.