Compared with the gasoline engine, diesel engine abnormal sound diagnosis is more difficult to grasp, this is decided by the structure characteristics and working characteristics of the diesel engine, such as compression ratio, thermal load, work is relatively rough, big noise, broken oil cannot instantly, and even some diesel oil at the opening of the position of the people not easy to close, to the diagnosis of abnormal noise also brings inconvenience. However, the abnormal sound of the diesel engine has its specific rules, as long as the analysis and comparison, look at the phenomenon of grasping the essence, it is possible to find out its regularity.
Diagnosis and treatment of abnormal sound of fan blade
North Benz V3 engine accessories at work, with the fan blade used for a long time, sometimes suddenly issued a “squelch” of the noise, especially with the increase of engine speed, the noise also increases, this kind of phenomenon is called fan blade noise.
The reason
Due to the vibration of the fan blade, the blade and the hub of the fan blades are loose.
Loosen the fastening screws.
The root of fan blade cracks, which changes the blade inclination angle.
Ben Ben V3 fan blade rupture.
The diagnosis and treatment methods
In the process of running the car, if suddenly heard abnormal sound, it should immediately flameout, and then stop to check, in order to avoid fan blades broken and broken radiator.
Use the starter to drive the fan to rotate at low speed, to see whether there is no running or swing phenomenon.
To stop the engine rotation, with the hands before and after the fan blade has a sense of openness, indicating that the fan belt pulley fastening bolts loose, or fastening the fan screws loose, should be timely welding or replacement.
When the root parts of the fan blades of the North Ben V3 are found to have cracks, they should be welded or replaced in time.
When the fan blade breaks on the way, but when it is unable to repair, remove the fan, cut off the symmetrical blade, and continue to drive after installation. It is worth noting that: when the blade is cut after use, due to the fan exhaust volume reduction, the engine speed can not be too high, in order to prevent the engine water temperature is too high.