676962126
1, idling for a long time due to damage and injury phenomenon: the bearing surface alloy layer is squeezed shifting and flanging and flaking.
The reason: the engine idle speed automatically transfer time is too long, the engine is below the normal operating temperature operation, the interior of the fuel injected into the combustion is not completely burned, part of not burning fuel along the cylinder wall into the crankcase, the destruction of the lubricating oil the lower film lubrication.
Idle automatically turn the low speed, a small amount of oil pump oil, causing bearing force surface and the shaft is slightly dry friction of the bearing alloy layer surface damage, accelerated wear of the shaft and bearing damage while debris and damage. To prevent the occurrence of such problems is necessary to follow the rules, each time you start the engine idling must not exceed 5 minutes, the engine no-load operation can not be less than 850 rev / min.
2, the engine stop after work for a long time (shutdown) caused damage and injury phenomenon: the bearing surface of the alloy is galling uneven surface alloy shift from the middle to both sides.
The reason: the engine after a long time a large load work, the internal parts are in a state of maximum operating temperature, especially the part of the combustion chamber at a high temperature, cooling system and lubrication system stopped working after the engine is stopped, the heat does not go out and parts temperature, so that the destruction of the oil film on the surface of the lubrication, when the re-start, has not yet formed in the surface of the lubrication oil desert, abnormal wear of the bearing has occurred. The sliding bearing of the turbocharger especially more severe injury, while too high a temperature will cause the shaft hole of the deformation and destruction of the running accuracy accelerate damage to the engine. The occurrence of this phenomenon on the piston, cylinder liner and cylinder seals will cause serious injury. The engine for a long time after the larger work load in the engine at no load at low speed for 10 minutes or more, the internal temperature decreases again after shutdown.
3, after the engine is started directly into the high-speed operation and full load operation of bearing damage or injury phenomenon: the engine the seventh and sixth main bearing severe wear, the other bearing damage.
The reason: no-load temperature operation after starting the engine, put into the high-speed operation and full load operation. Demand because the engine has reached its operating temperature, the contact surface and running clearances of the ministries of the force is not the best, but poor low-temperature liquid lubricants, the moving surface of the heat can not quickly oil away and other reasons, it will cause injury or damage of the pad. Outside temperature is lower, the more serious the damage to the pad. Prevent the occurrence of such problems must be required for heating operation, the engine starts in the low-speed air operation, when the engine water temperature rises above 70 ° C can be put into operation.
4, due to the adjustment and operational errors caused by bearing damage or damage to the phenomenon: crankshaft thrust bearing (thrust ring) severe wear or damage, Road 7 main bearing damage.
The reason: the crankshaft axial clearance is too large or too small, will cause the crankshaft thrust bearing damage. Axial clearance in the course of large impact, small temperature rise in the axial gap will have abnormal wear and tear caused by damage to the Road 7 main bearing. Prevent the occurrence of such problems, the axial clearance of the crankshaft in the engine mounting must be guaranteed in the standard range of 0.18 ~ 0.35mm.
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