How can a diesel engine be quickly eliminated after a malfunction? First of all, we must have a more detailed understanding of the working principle of the diesel engine. Second, we must understand in detail the structure and working principle of each system and the relationship between the various systems, we can quickly determine the location of the fault based on the performance of the fault. Although the performance of failures is ever-changing, there are always certain regularities to follow. To sum up, there are nothing more than the following: 1. Abnormal sound: abnormal percussive sounds, letting off the sound of artillery, and squeaking; 2. Abnormal motion: The diesel engine is not easy to start, produces violent vibration during operation, with immovable load; 3. Appearance anomaly: white smoke, black smoke, blue smoke, gas leakage, oil leakage, water leakage; 4. Abnormal temperature: locomotive cooling water temperature is too high, bearing Overheating; 5. Abnormal pressure: oil pressure is too low, cylinder pressure is too low; 6. Abnormal smell: smoke, burnt smell, odor. After a diesel engine malfunctions, it is necessary to diagnose faults. Commonly used methods are as follows: 1) Abnormal noise judging: Distinguish abnormal sound parts and different sounds. If the main bearing gap is too large, the sound generated by the impact is very dull. Valve knock piston sound crisp. 2) Part stop method: After analysis, it is suspected that the malfunction caused by that part can make the part stop working and observe whether the symptoms have disappeared. Generally, it is usually used to determine whether the cylinder has a fault. 3) Comparison method: If it is suspected that a fault is caused by a component or part, the component may be updated, and then the working conditions before and after comparison. 4) Heuristic method: heuristically adjusts the diesel engine based on preliminary analysis and judgment. For example, when a diesel engine smokes, if it is judged, it can tentatively change the fuel injection pressure or change the advance angle in a small range and observe the effect of change. 5) Inspection of instruments and meters: Use the instruments and meters to check the diesel engine. If the cylinder pressure gauge is used to check whether the pressure meets the requirements, determine whether there is any leakage or other failure. In the actual work, the above various means can be comprehensively used to determine the fault so that the fault can be found quickly and accurately. In short, mastering the regularity of diesel engine faults will greatly help the actual repair work. At the same time, it is good at summing up and making records to facilitate future searches.
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