Cause analysis of abnormal noise of case excavator engine:
The occurrence of abnormal noise in excavator repair of Case engine is often related to the engine speed, the load borne by the engine, the engine temperature and the engine's working circulating oil pipe. Therefore, when checking the cause of abnormal noise in Case engine, you can further find out the location where the abnormal noise occurs
1. The "Relationship between Engine Speed and Abnormal Noise of Case Excavator Engine"
(1) Abnormal engine noise occurs at idle or low speed Generally, the causes are: the gap between the piston and cylinder wall of case engine is too large, or the piston pin is assembled too tightly, or the gap between the tappet and the guide hole of case engine is too large
(2) The sudden occurrence of abnormal noise of case engine at a certain speed may be caused by broken crankshaft, loose piston pin bushing, broken camshaft timing gear or loose fixing nut
(3) Abnormal noise occurs when the Case engine accelerates rapidly, which may be caused by the following factors: loose connecting rod bearing, bearing bush burning or rotating due to size discrepancy, loose crankshaft bearing or bearing bush burning, broken piston pin, broken crankshaft, etc
2. The Abnormal Noise of Case Excavator's Engine "Relation with Excavator Load"
(1) The abnormal noise occurred when a cylinder of the engine cut off, and it disappeared after a while The reason may be that the engine piston knocks, the connecting rod bearing is loose, or the piston ring leaks
(2) The abnormal noise occurs when one of the engine cylinders is off fire, but the abnormal noise is getting louder and louder, which may be caused by: loose piston pin copper sleeve, excessive taper of piston skirt, piston pin channeling, loose connecting rod bearing cap fixing bolts, or melting and peeling of connecting rod bearing bush alloy, etc
(3) If the fire breaks between two adjacent cylinders of the engine and the case engine makes abnormal noise, the reason may be that the crankshaft bearing is loose
3. The "Relationship between Abnormal Noise and Temperature" of Case Excavator Engine
(1) Abnormal noise at low temperature, which gradually disappears when the temperature rises The cause of abnormal noise of Case engine is that the clearance between piston and cylinder wall is too large, or the engine oil pressure is low and lubrication is poor
(2) The abnormal noise will disappear as the temperature decreases The cause of abnormal noise of Case engine is that the piston of Case engine is deformed, or the clearance between piston rings is too small, or it may be caused by premature combustion due to overheating.
