Is there abnormal noise when the excavator cold starts? Don't ignore the engine distress signal
The recent cold air has broken the dream of all aircraft owners to continue to rush for work. Extreme weather of around minus 40 degrees has even occurred in northern China, making it difficult for people to travel, let alone drive excavators.
However, many friends in the central plains are still seizing the last moment of construction to make money. However, the construction rhythm has to be stopped because of the failure of the machine. Today, let's take a look at how to quickly solve the problem of abnormal noise when the cold car starts!
Fault phenomenon
According to the owner's description, the aircraft has never experienced this fault problem when the weather is warm. Recently, the temperature has dropped, and there is a very loud abnormal noise when the engine is started in a cold car. If it is started in a hot car, there is no abnormality.
In addition, the owner has also tested that when the engine is at low speed or high speed, there is still noise and abnormal noise when starting. The owner is worried that the fault will be expanded, so he immediately contacted the maintenance master to repair it.
fault analysis
The maintenance master gave the owner a reassurance at the scene. This failure is not uncommon in ordinary times, and it is easier to cause failures in cold weather. Therefore, the maintenance experience is very sufficient, and it is expected that the downtime will not be too long. Let's take a look at the cause of the failure first:
First, the most common reason is that there is a gap between the engine valve seat ring and the cylinder head, which leads to failure problems;
Second: the engine valve seat ring is damaged, or the quality of the valve seat ring replaced before is not up to standard;
Fault maintenance process:
First, in order to make the troubleshooting more accurate, the maintenance master should first determine the fault phenomenon, which is consistent with the description of the owner. When the machine is started cold, the engine noise can be heard obviously. When the engine is started hot, there is no abnormality. In addition, there will be obvious noise and abnormal noise when the engine is started at low speed and high speed.
Second: at the same time, check that when there is abnormal noise, some cylinders of the engine are not working well. When the noise disappears after the hot car, the cylinders work normally again.
Third: according to the above phenomena, it can be judged that some cylinders of the engine are not working well, because the valve seat ring is loose or damaged, which leads to the failure.
Fourth: according to the judgment, the damaged and irreparable seat ring was disassembled and replaced with a new part. After installation, restart and test run, the cold start noise disappeared. After a period of test run, the fault did not reappear, and the problem was successfully solved.
summary
The engine failure is relatively sudden and will catch everyone off guard. However, early detection, early maintenance, and efforts to minimize the loss of failure are the "fault solving tricks" worth everyone's reference and learning!
