Coup! Easily judge diesel abnormal sound
The general abnormal sound of diesel engines is mainly due to the sound caused by the moving parts during the movement and during the combustion, as well as the noise caused by the air leakage. The main sources of abnormal sounds come from the following reasons. (1) Due to the natural wear of the moving parts, the clearances for the movement are too large, such as the gap between the piston and the cylinder, the crankshaft bearing and the crankshaft journal gap produce a knocking and knocking sound. (2) Due to poor lubrication and increased wear of the moving parts, the clearance gap increases quickly and abnormal noise is generated beyond the limit gap. Or, due to poor lubrication, the moving parts may burn abnormal sounds, such as the crankshaft bearing ring and the connecting rod bearing ring. . (3) The looseness of the connection bolts of some moving parts causes the impact noise, such as the looseness of the flywheel bolts and the connecting rod bolts. (4) The valve clearance is too small, so that the valve rod is bent, or the tappet body is stuck in the cylinder tappet hole, so that the rocker and the valve, the valve stem and the valve adjustment bolt or valve Putters and tappets, etc., make a knocking noise. (5) The abnormal sound occurs when the individual parts are damaged, such as the piston ring is broken, the air spring is broken, and the idle gear bush is loose. (6) When the clearance between the piston pin and the connecting rod small head bush is too large or the connecting rod small head bush is loose and the piston pin clamping spring does not fall into place, etc., the mutual moving parts make a knocking sound. (7) Loosening of the valve adjusting bolt The locking nut is loose, the valve adjusting bolt is loosened, the valve clearance is too large, and the valve push rod, the tappet body, the valve adjusting bolt and the like emit a knocking sound. (8) The valve seat ring is loosened, so that the air valve seat and the cylinder head and the gas valve can make a knocking sound or leak sound. (9) Due to the sudden explosion and pre-ignition, as well as the non-strict sealing of the cylinder head gasket, the metal knocking and air leakage (puff) sounded in the diesel engine. (10) diesel fuel injection pump damaged steel sheet.
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