what kind of failures are prone to occur in the engine of a used excavator?
Overheating failure: High temperature weather itself makes it difficult for the engine to dissipate heat, and the cooling system of the used excavator may have problems such as aging and performance degradation, such as radiator blockage and poor fan performance, which will cause the engine heat to be unable to dissipate in time, overheating, and excessive engine temperature. Long-term overheating will cause the engine parts to expand, destroying the normal matching clearance, and in severe cases may cause mechanical failures such as cylinder pulling and shaft sticking.
Lubrication system failure: High temperature will reduce the viscosity of the engine lubricating oil and reduce the lubrication performance. For a second-hand excavator, the internal parts of its engine may have a certain degree of wear. When the lubricating oil’s lubrication performance deteriorates, the friction between the parts will increase, which may easily cause wear and tear, burning and other failures. At the same time, high temperature may also make the lubricating oil more easily oxidized and deteriorated, produce sludge and carbon deposits, block the oil circuit of the lubrication system, affect the normal circulation of the lubricating oil, and further aggravate the problem of poor lubrication.
Fuel system failure: In hot weather, the volatility of fuel increases, which can easily cause air blockage in the fuel system. The fuel system of a used excavator may have some problems with poor sealing or aging, which can make the air blockage phenomenon more serious. Air blockage can lead to poor fuel supply, causing the engine to have problems such as insufficient power, shaking, or even flameout. In addition, high temperatures can also make it easier for impurities in the fuel to precipitate and accumulate, clogging the fuel filter and fuel injector, affecting the fuel injection effect and combustion quality.
Cooling system failure: The cooling system of a used excavator may have problems such as aging components and water leakage. In hot weather, the burden on the cooling system increases. If the coolant leaks, the cooling effect will drop sharply and the engine temperature will rise rapidly. At the same time, scale and rust in the cooling system will also affect the heat dissipation efficiency, further aggravating the high temperature problem of the engine. In addition, if the cooling system’s water pump, thermostat and other components fail, it will also affect the normal circulation of the coolant, resulting in poor engine cooling.
Electrical system failure: High temperature will increase the temperature in the engine compartment, which has a certain impact on the components of the electrical system. The electrical system circuit of the second-hand excavator may have problems such as aging and insulation damage. In a high temperature environment, these hidden dangers are more likely to cause short circuits, open circuits and other failures, affecting the normal start and operation of the engine. For example, the performance of the spark plugs, ignition coils and other components of the ignition system may be unstable at high temperatures, resulting in poor ignition, incomplete engine combustion, and reduced power.
Valve failure: High temperature will increase the thermal expansion of the engine’s valves and related components. For second-hand excavators, due to long-term use of the engine, the seal between the valve and the valve seat may have a certain degree of wear. Under high temperature, this wear may be further aggravated, resulting in poor valve sealing and air leakage. This will reduce the engine’s compression ratio and power, and may also cause engine vibration, black smoke from the exhaust pipe and other problems.
