Causes and elimination methods of high engine temp

2022-08-01
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Causes and troubleshooting of excessive engine temperature of crane

I. causes of excessive engine temperature

1 Water leakage or insufficient cooling water in the cooling system; 2. the indication of water temperature gauge is inaccurate or out of order; 3. the cooling system has too much scale and poor heat dissipation effect; 4. the radiator shield or radiator core ventilation duct is blocked by sundries, resulting in poor heat dissipation; 5. the water pump and fan belts are too loose or broken; 6. the water pump is damaged, the fan blade is installed reversely or deformed, and the wind ring is damaged; 7. the thermostat is damaged at the closed position of the main valve; 8. the engine runs overloaded for a long time and the fuel supply time is too late

II. Troubleshooting for excessive engine temperature

when the engine has the fault of excessive water temperature during operation, pay attention to the fault phenomenon, find out the cause and eliminate it. First, check whether the water temperature gauge is out of order. If not, replace it; Then check whether the water tank is short of water and whether the water inlet pipe and radiator are broken and leaking. In addition to direct observation from the outside, the method of pumping air can also be used to check the leaking part. The leaking part of the radiator can be repaired by tin welding. If a radiator pipe is seriously broken, the two ends can be flattened and blocked. If a slight water leakage is found during work, it can be blocked with soap and repaired after parking. If it is not for the above reasons, further check whether the engine housing is cracked, whether the water stop ring is damaged, and whether the water pump drain hole is leaking. Finally, check whether the exhaust valve of the radiator cap is invalid. If it is invalid, replace it

if it is not a cooling water leakage problem, it should be divided into two cases, so it should be comprehensively inspected and tested at this time, and the commissioning obstacles should be analyzed and eliminated. 1. sudden high water temperature. First, check whether the radiator is overheated. If the radiator temperature is too high, it means that the cylinder gasket is damaged. At this time, pay attention to check whether the upper plane of the engine body and the joint surface of the cylinder head are seriously warped and deformed. If it is deformed, repair it in time. If the temperature of the radiator is not high, it indicates that the cooling water circulation is poor. Check whether the fan belt is broken or seriously slipping. If it is normal, check whether the radiator outlet pipe is shrunken and whether the inner hole is blocked by delamination. Find out the cause and eliminate it. The emergency method is to put an appropriate large spring support in the shrunken pipe. Then check whether the expansion cylinder of the thermostat is broken. If it is broken, well 3 chemical, a large Japanese chemical manufacturer, started a project to replace it as an expert in the petrochemical field about one year ago. If the thermostat is normal, it means that the water pump is damaged, and the water pump should be carefully inspected and repaired. 2. non sudden high water temperature. For the phenomenon that the temperature is not too high suddenly, the engine speed should be increased to observe whether the water inlet is turned over, and whether it is a large amount or a small amount of water. If a large amount of water is turned over and the temperature of the radiator is uneven, it means that some cooling pipes are blocked, which should be paid more attention in the cold winter. When a small amount of water is turned over at the water inlet and the engine temperature is low before and high after, it indicates that the water distribution pipe has been damaged or blocked and should be replaced in time. If it is not for the above reasons, it may be that there is too much scale in the cooling system and the water channel is not smooth. If the water filling port does not turn over, the appearance of the cooling system and the mechanical part of the engine shall be carefully checked and analyzed

first, check whether the shutter is closed or the opening is insufficient, and whether the fan rotates normally. If everything is normal and the engine is still overheated, check the fan air volume. If the air volume is insufficient, the angle of the fan blade shall be adjusted, and the blade head shall be properly bent or changed

if the engine is still overheated under normal conditions of the cooling system, the reasons for use should be considered when recording its maximum tension resistance value. In short, the causes of engine overheating are various, and the above methods can be flexibly used to check and eliminate according to specific conditions

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