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.
Crankshaft bearing abnormal sound
Baotou North Benz parts crankshaft bearings than the connecting rod bearing the sound of heavy and powerful. Mainly for the sudden acceleration of a dull “boring” sound, accompanied by severe vibration, the noise usually occurs in the lower part of the cylinder, and with the increase of the speed and load (such as car climbing or full) increased.
The reason
Baotou North Benz parts crankshaft bearing and shaft neck wear serious, or bearing cap bolt tightening torque is insufficient, loose, resulting in the radial clearance is too large, so that the upper and lower crankshaft beating and percussion.
The crankshaft bearing assembly in the gap is too small, the friction surface from overheating and burning bearing alloy, or lock.
If the oil supply is insufficient or the quality is too poor, it is difficult to form the lubricating oil film, causing the dry or dry friction on the friction surface.
The diagnosis and treatment methods
The crankshaft bearing is one of the most serious faults. The main bearing should be stopped immediately after the main bearing.
The diagnosis of the crankshaft bearing of the North Benz parts in Baotou is similar to that of the connecting rod bearing, but when the oil is broken, the oil supply of the two adjacent cylinders must be broken, so as to confirm the sound of the crankshaft bearings.