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.
Valve spring ring
Valve spring ring in engine idling, can clearly hear the clatter of the noise in the valve cover, and sometimes with hum, decrease the acceleration performance of the car is serious, and the difficulties associated with starting and individual cylinder bad phenomenon.
The reason
North Ben V3 parts valve spring quality is poor, too weak or skewed.
Valve spring fracture.
The diagnosis and treatment methods
The North Benz V3 parts of valve spring ring is mainly due to the spring fracture, it sounds not ringing sound clean foot valve. Valve spring is broken, open the valve chamber cover can be seen.
In the case of noise is not very obvious, the jitter throttle, when the North Ben V3 parts engine to change the speed, the valve spring will be issued a clear rhythm of the abnormal sound.
In static state, can be used to rotate the tool to check the spring, but also can be used to slide the percussion spring, if the sound is different from other springs, there is hoarse voice, indicating that the spring has a crack or break, should be replaced in a timely manner.
If the on the way at the same time a few spring break, can affect the running of on-site parking, remove the broken spring, both ends of the plane relative to the original way, installed in the valve stem, temporarily can work, but to repair must be replaced after.