1. Analysis of the causes of crankshaft wear.
There are many reasons for the wear of the crankshaft of Wuling diesel engine, but the main reasons are as follows:
1.Poor lubrication: the lubrication of the crankshaft mainly depends on the oil, if the quality of the oil is poor or oxidation and deterioration, or the oil pressure is too low due to the blockage of the oil passage and improper adjustment of the pressure limiting valve, so that the crankshaft can not be fully lubricated, which will make the crankshaft remain in a semi-dry friction state for a long time, and eventually lead to wear of the crankshaft.
2.Defects in the design or manufacturing process of the crankshaft: Defects in the design or manufacturing process of the crankshaft, such as poor balance of the crankshaft, uneven material, insufficient strength of the crankshaft, etc., can also lead to wear and tear of the crankshaft.
3.Improper use management: Improper use management is also an important cause of crankshaft wear. For example, the operator does not operate according to the regulations, long-term overload, and does not repair and maintain in time, which will accelerate the wear and tear of the crankshaft.
Second, the repair method of crankshaft wear.
In view of the problem of crankshaft wear of Wuling diesel engine, the following repair methods can be taken:
1.Local repair method: For the local wear parts on the crankshaft, local surfacing welding, repair welding or metal spraying can be used to repair. This is done by thoroughly cleaning the worn area and then repairing it using an appropriate welding or spraying process. When surfacing or spraying, a welding rod or coating that matches the crankshaft material should be selected to prevent thermal deformation.
2.Crankshaft transposition method: When the bearing clearance at both ends of the crankshaft is too large or the irregular wear caused by the loosening of the bearing seat, the crankshaft transposition method can be used to repair. The specific operation method is to first replace the crankshaft with a larger wear to a smaller bearing, and then adjust the bearing clearance to make the crankshaft run normally. When replacing the bearing, the brand and model of the bearing with reliable quality should be selected to ensure the reliability and service life of the bearing.
3.Crankshaft replacement method: If the crankshaft is severely worn and cannot be restored by local repair or transposition repair, the entire crankshaft needs to be replaced. When replacing the crankshaft, the crankshaft should be exactly the same model and size as the original machine to prevent installation difficulties or problems in use caused by mismatch. When installing a new crankshaft, it should be assembled in accordance with the specified sequence and requirements, and ensure that the clearance of each part meets the standard requirements. At the same time, it is also necessary to pay attention to check the quality of the bearing and the cleanliness of the lubricating oil, and replace the oil filter and air filter and other accessories in time to maintain the normal operation and service life of the crankshaft.
In short, for the problem of crankshaft wear of Wuling diesel engine, the appropriate repair method should be selected according to the actual situation. At the same time, strengthening the use management and regular maintenance are also important measures to reduce crankshaft wear. In the repair process, attention should be paid to detail processing and quality control to ensure that the repaired crankshaft can achieve good performance and reliability.