6 Construction Machinery Internal Combustion Engine Overheating Failure Causes and Removal Methods Zhao Dongguo Power Transmission and Transformation Construction Company. Chengdu 610051 does find out the causes of overheating faults, and gives full play to the economical and dynamic nature of construction machinery and equipment. Improve its service life. Significant. The internal combustion engine is the main vertical power source for Steamboat and construction machinery. The internal combustion engines mainly include gasoline engines and diesel engines. Because of its high thermal efficiency, wide use of fuel economy, and its own advantages, diesel engines are widely used in heavy duty steam trains, especially when it meets the needs of mechanical working conditions. Therefore, diesel engines are mostly used as power sources for construction machinery. However, if the use of improper maintenance is prone to overheating. Due to the complex working conditions of the internal combustion engine used in Cheng Machinery, the overheating faults are more likely to occur due to the harsh working environment. If the overheating fault is not eliminated in time, it will cause great harm, which will easily cause damage to the engine, increase fuel consumption, and reduce output power. As a repairman, during the repair process, it often encounters the treatment of an internal combustion engine overheating fault. So how to quickly and accurately find out the causes of overheating faults and eliminate them in time is very important. This is to give full play to the economics and dynamics of machinery and equipment. To increase its useful life is of great significance. 1 Internal-combustion engine overheat fault hazard and its causes The internal-combustion engine overheat fault is very harmful. Long-term overheating can easily lead to deformation of the machine, such as melting, jamming, and pulling the cylinder. This increases fuel consumption and reduces output power. There are many causes of overheating of the gas turbine. For example, when a large load operation is performed on a slope and when working in a hot summer season with a high ambient temperature and working in a desert plateau, the cooling system is affected and cannot fully function. Long-term overload and high deviating operating conditions Etc., this is caused by the influence of the working environment factors of the mechanical scale. It can be overcome by improving the operating conditions and reasonable operation. For overheating of the engine caused by a fault in the internal combustion engine, inspection and repair are required to restore normal operation. The overheating of the internal combustion engine causes overheating, mainly due to poor cooling performance of multiple cooling thermostats in the cooling system, and abnormal factors in the timing of the exhaust valve clearance, and not the timing of the ignition timing. Therefore, in the event of an overheating fault in an internal combustion engine, scientific analysis should be made based on the phenomenon of failure and timely detection of the cause of the failure. 2 Finding and resolving causes of overheating faults in internal combustion engines There are many causes of overheating faults in internal combustion engines. The reason for finding faults should be in the order from simple to complex. The failure of the cooling system is the main cause of engine overheating faults. When finding and troubleshooting overheating faults, the cooling system must first be checked and analyzed. 1 The cooling fluid is inspected and the cooling system is not working properly. First check. The cooling system liquid level is normal, if the cooling liquid surface is low, the cooling water of the internal combustion engine is insufficient. The original flash should be identified and the coolant should be made up as required to continue operation. After a certain period of time, the temperature of the internal combustion engine should be restored to the normal temperature range. This indicates that the overheated original received date 19991217 was not replenished due to the normal consumption of coolant. If the internal combustion engine overheats again in a relatively short period of time and the coolant level drops, the leaking phenomenon occurs in the clear cooling system. First of all, observe the surface of the internal combustion engine, and note whether there is leakage between the cylinder head and the body, such as the joint and the oil pan. If the fault persists after the inspection, check the condition of the lower cover. If the air cushion breaks or the cylinder head warps and deforms because of the tight seal in the cylinder, the high pressure gas pressure in the cylinder is high. As a result of the overheating of the internal combustion engine caused by the boiling of the coolant and the determination of whether the cylinder head gasket is broken, it is possible to open the radiator inlet cover in such several ways, and start the internal combustion engine and speed, and if a large number of air bubbles are observed in the radiator room, Then, the cylinder head gasket is damaged or the cylinder head and the body are loosely joined. The cylinder head gasket should be replaced or the cylinder head must be repaired to eliminate the malfunction. 2 The coolant surface is normal and the internal combustion engine is still overheated. Check the operating status of the pump thermostat. If the thermostat fails. The cooling water cannot pass through the radiator or can only partly flow through the radiator and cannot dissipate heat sufficiently. The water temperature will rapidly increase and cause the internal combustion engine to overheat. This can be done by means of a touch-and-shoot method. If the temperature difference of the water pipe is very large, it is mostly a thermostat. Failure, emergency repairs can temporarily split the temperature thermostat. Check the working condition of the cooling 7-foot radiator. Radiator heat dissipation performance, causing the internal combustion engine overheating, an important original spider should be searched from both the appearance and internal faults. Check the appearance of the heat sink. Because the construction machinery is mostly operated under the conditions of large dust and muddy roads, the radiator fins and the machine are excessively fouled, and the pores are blocked to cause poor heat dissipation, resulting in overheating of the combustion engine. At this time, high pressure tap water or high pressure may be used. Le air rushes away from the opposite side to remove dirt and debris. When the factory mechanical damage makes the heat sink's heat sink deform or stick to it can also make the heat dissipation performance is poor, causing the internal combustion engine to overheat; repair. Try to restore the heat sink to its normal shape. , Check the cooling water circulation is not smooth and congestion. If the cooler symbol is blocked. As a result, the thermal performance also decreases and the internal combustion engine temperature becomes too high. Judgment method is, in the machine pours heat 1. Use helium to touch the inlet and outlet pipes of the heat sink, under normal circumstances there should be a set temperature difference, but if the temperature difference is greater, then the cooling water pipe is blocked. Should be cleaned or dredged to eliminate plugging faults. , Check the operation of the internal combustion engine fan. In the above check 7, the internal combustion engine is still in an overheated condition, and the fan and the fan belt should be inspected. Check the fan belt for slipping or broken conditions. Overheating caused by other causes Check the enthalpy and ignition timing. Any advance or lag in the advance of the oil cutting machine can cause overheating of the firebrower due to advance or delay of the injection advance. In the burning of the heartburn combustion gas cylinder wall contact with the blood-sweet design site 9 therefore the heat transferred to the cylinder and cause overheating, should be adjusted or repaired in accordance with the standard to eliminate fuel injection failure. If the gasoline engine is misfiring, overheating will also occur. , Check the exhaust valve clearance. Because the gap adjustment of the exhaust valve of the internal combustion engine is not one, the exhaust gas of the combustion 17 will be eliminated. Caused by the body temperature is too high by the above check to 7 still can not rule out the overheating fault. It should be considered whether the exhaust valve clearance is correct. And according to the standard into the adjustment. Check the machine, the heat of the fault-type machinery with oil radiator, oil radiator surface dirt or poor oil, making it poor heat dissipation, will also make the internal combustion engine overheating. 4 Judging the working condition of the combustion chamber Excessive carbon deposition in the combustion chamber of the internal combustion engine. Exhaust valves and other parts of the carbon deposition are also more. It affects the body after completing the above checks. Still can not rule out the internal combustion engine overheating failure, should open the cylinder head to check the work of combustion Wei, if the internal combustion engine overheating failure, the driving staff should recognize that through the above method, the person in the Jianzhong to gradually pay the flashover engine overheating fault Hugo Can quickly eliminate the engine overheating failure and restore the normal operating conditions of the engine. Due to the complex working conditions and poor working environment, construction machinery should pay more attention to the use and maintenance work, reduce the occurrence of internal combustion engine overheating faults, and improve the overall efficiency of the equipment. 1 Liu Quanfu, et al. Automotive Service and Maintenance 500 Q M. Beijing Beijing University of Technology Press, 1990. 2 Yang Jingzhang. Internal combustion engine for construction machinery. Beijing Water Conservancy and Electric Power Press, 198 Transmission and Transformation Construction Company engineers, engaged in mechanical equipment maintenance management.
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