We analyze the cause of engine failure through reference materials according to the function and requirements. 1) Because the car uses the latest high-power, high-power, high-speed aircraft. Therefore, there are very strict regulations on the quality of diesel engines. It must meet the discharge performance and anti-vibration capacity. It is necessary to ensure sufficient capacity of the flammable mixture (CO2 gas) in the combustion chamber to prevent petroleum. In addition, it is necessary to prevent malfunctions such as overheating of the engine and knocking due to overheating.2. Engine design requires a comprehensive analysis as it must be taken into account that there is some interference between the diesel engine and parts such as the gasoline engine, fuel system, accelerators and coolers. It will be executed.3. In case of failure, find a troubleshooting method in time.4. After performing the maintenance process, summarize some simple maintenance plans. 5. Take and implement the corresponding precautions according to the diagnosis.6. Finally, together with the above conclusions, we propose common engine failures and solutions. (1) Strengthen the maintenance of equipment such as accelerators and water pumps, and strengthen the oil filter to carry out regular inspections and maintenance to prevent liquid leakage. (2) Periodically check the operating conditions of the lubricating grease and cooling water system to find and resolve the problem in time. (3) Strictly execute the operating speed and load curve specified in the engine operating rules. Strictly execute the operation rule of (4). The engine cooling water system prevents burn-in failures caused by excessive idle speed.