The engine shakes when idling. The engine has no external leakage during the 7000km oil change cycle, but it is seriously lacking. The main reason for the blue smoke from the engine exhaust pipe is that the engine burns oil. Let's analyze the causes of engine oil burning. The high oil temperature of the engine oil may be due to the blockage of the air inlet and exhaust valves of the excavator, and the sealing sleeve of the air inlet and exhaust valves is damaged; Excavator piston and piston ring are worn; The temperature of excavator engine is too high during operation; Incorrect brand of engine oil is used; Caused by excessive oil pressure; The engine leaks oil.
Exclusion method:
Check the engine for oil leakage. It is found that the engine exhaust emits blue smoke, which is mainly caused by the oil channeling to the combustion chamber due to the wear of the piston and piston ring. If necessary, repair the engine and replace the piston and piston ring.
Check whether the exhaust valve of the engine is stuck to prevent oil from entering the cylinder. Check whether the oil grade used is correct. Pay attention to adjusting the pressure regulating device of the engine to make the engine work under the appropriate oil pressure and eliminate the possible factors causing engine overheating.
First, check whether the diesel oil of excavator is mixed with water? Check whether the injection timing of excavator engine is correct? After maintenance, loosen the high-pressure oil pipe connector of the excavator fuel injection pump, and air bubbles are found and eliminated
When the excavator engine was stopped and the high-pressure oil pipe was removed, the oil level rose It indicates that the fuel injector and oil outlet valve are not tightly closed. When the excavator engine is started, the high-pressure gas in the cylinder flows through the fuel injector, high-pressure oil pipe and oil outlet valve to the low-pressure oil circuit, causing serious air lock, making the oil supply law abnormal, resulting in the excavator only emitting white smoke and unable to start
Replace the oil outlet valve. The excavator only emits white smoke and cannot be started for troubleshooting.
