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Notice! Pay attention to avoid these wrong operations when repairing diesel generator sets

June 09, 2022
After the diesel generator set has been running for a period of time, it is inevitable that some faults will occur. At this time, it needs to be repaired. If it is a professional maintenance personnel, there will generally be corresponding testing equipment for fault detection. , look, check, test" and other methods to judge the fault, and then follow the step-by-step maintenance from simple to complex, first table, then inside, first assembly and then parts. In the process of maintenance, users must pay attention to the methods, the following errors The operation must be avoided to prevent further damage to the unit.
       1. Blindly replace parts
       It is relatively difficult to judge and eliminate the failure of diesel generator sets, but it cannot be large or small. As long as the parts that may cause the failure are considered to be the parts, replace them one by one. As a result, not only the fault was not eliminated, but the parts that should not be replaced were replaced at will. Some faulty components can be repaired to restore their technical performance, such as generators, gear oil pumps, etc., which can be repaired without complicated repair processes. During maintenance, the cause and location of the fault should be carefully analyzed and determined according to the fault phenomenon, and the repairable parts should be repaired to restore the technical performance.
       2. Do not pay attention to the detection of the fitting clearance of the parts
       In the maintenance of common diesel generator sets, the clearance between the piston and the cylinder liner, the "three clearances" of the piston ring, the top clearance of the piston, the clearance of the valve, the clearance of the plunger, the clearance of the brake shoe, the meshing clearance of the driving and driven gears, the axial and Radial clearance, valve stem and valve guide matching clearance, etc., all types of models have strict requirements, and must be measured during maintenance, and parts that do not meet the clearance requirements must be adjusted or replaced. In the actual maintenance work, there are many phenomena of blindly assembling parts without measuring the fitting clearance, resulting in early wear or ablation of bearings, burning oil of diesel generators, difficulty in starting or deflagration, broken piston rings, collision of parts, oil leakage, etc. Air leakage, etc. Sometimes even due to improper fitting clearance of parts, serious mechanical damage accidents occur.
       3. The parts are reversed during equipment assembly
       When repairing equipment, some parts are assembled with strict direction requirements; only correct installation can ensure the normal operation of parts. The external features of some parts are not obvious, and they can be installed both positive and negative. In actual work, the reverse installation often occurs, resulting in early damage to parts, machinery not working properly, and equipment damage accidents. Such as engine cylinder liners, unequal distance valve springs, engine pistons, piston rings, fan blades, gear oil pump side plates, skeleton oil seals, thrust washers, thrust bearings, thrust washers, oil retaining rings, fuel injection pump plungers , Clutch friction disc hub, drive shaft universal joint and other components are easy to install in reverse if you do not understand the structure and installation precautions. Resulting in abnormal work after assembly, resulting in equipment failure. Therefore, when assembling parts, maintenance personnel must master the structure and installation direction of the parts and require installation.
       4. Irregular maintenance methods
       In the maintenance of diesel generator sets, the correct maintenance method is not adopted, and emergency measures are considered to be omnipotent. Such as the often encountered "repair by welding", is an example. Some parts can be repaired, but some maintenance personnel often use the method of "welding to death" in order to save trouble; in order to make the diesel generator "powerful", artificially increase the fuel supply of the fuel injection pump and increase the fuel injection of the injector. pressure.
       5. The unit maintenance cannot correctly judge and analyze the fault
       Because some maintenance personnel are not clear about the mechanical structure and principle of the equipment, they have not carefully analyzed the cause of the failure, and they have not been able to accurately determine the fault location, so they disassemble and repair the equipment. question.
       It is hoped that the above several wrong maintenance methods should be avoided by the majority of users. When the diesel generator set fails, the cause of the fault must be found out fundamentally, and formal maintenance methods must be adopted to eliminate the fault, so as to maximize the service life of the diesel generator set.