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.
Piston pin abnormal
Baotou beiben engine accessories at the same speed, continuous piston pin should be sharp crisp sound than the piston knocking sound, and idle speed and temperature rise after sound cloudy.
The reason
Baotou beiben parts piston pin hole with songkuang.
Piston pin and connecting rod bushing wear, so that the gap is too large.
The oil pressure is too low, the oil splash is insufficient, the lubrication is not good.
The piston pin circlip off, the free movement of the piston pin.
The diagnosis and treatment methods
The engine is idling up to speed, jitter throttle, sound change, and each time the throttle detonation can hear clear and crisp continuous sound, it can be considered as the piston pin ring.
The issue in high speed noise is more serious, the higher the speed of sound is greater; off the oil test in noise maximum speed, if the noise is not only weakened, but becomes messy, that is the piston pin and bushing with songkuang.
When Baotou beiben parts piston pin sound obvious, must be repaired, so as not to break or damage the piston, cylinder sleeve, cylinder head or cylinder.