The engine overheating is by water temperature display, use in the area below an altitude of 1500m diesel vehicles, when the coolant temperature up to 110 degrees, if the expansion tank ventilation valve as spewed steam like boiled water, touch the radiator or the expansion tank when they feel very hot, commonly known as “boil”. Is a symbol of high temperature.
The reason
The cooling fluid is not suitable.
Vehicle overload.
Baotou North heavy duty truck parts radiator water jacket deposition of excessive scale, so that cooling fluid circulation is not smooth. Especially in the car to stop a few days later, again when the water temperature is too high, mostly due to rest for several days, scale, impurities in the coolant are deposited on the bottom of the radiator, causing channel block and the coolant flow is not smooth.
Damage or loss of cooling fan guide cover.
Air cooling system.
The radiator, air duct, air guide cover and engine surface dirt. The fan of the engine is pumped to cool the radiator and engine. Dust in the air is always part of the adhesion in the air through the machine, especially when the surface of the oil is dirty, dirty faster, so that its heat dissipation performance is significantly reduced, resulting in engine overheating.
7 Baotou beiben parts thermostat is damaged, the cooling liquid can only take small circulation instead of the work cycle, causing the engine overheating.
The lack of water pump, the cooling liquid in the waterway flowing slowly, the heat can not be taken away, in the high load and low speed conditions is more prominent.
The amount of air to reduce the suction fan. The use of fan clutch force transmission parts failure, or pulley oil, or belt elongation will cause the lower fan speed, air suction decrease. In addition, the radiator fin deformation also reduces the amount of inhaled air, so that the heat loss caused by engine overheating.
The fuel injection advance angle is too small, the diesel combustion period and after combustion period growth slow burning, hot gas and cylinder wall contact time after burning, more heat to the cylinder, the coolant temperature surge and overheating.
The diagnosis and treatment methods
First, observe the operation of the fan, fan clutch transmission is reliable, fan belt tightness is appropriate, the belt is slipping. Cummins engine fan belt tightness adjustment is free; if the fan belt relaxation, it may be a fan belt tensioner failure, overhaul; if the belt tension and moderate slip, the pulley should be cleaned of grease.
Check whether the amount of exhaust fan enough available, a sheet of paper on the end face of the radiator before, if the paper is tightly hold, that air volume enough, if not sucked or blowing out, the fan blades installed or anti deformation, should be adjusted or replaced.
Touch the thermostat on both sides of the temperature to see whether there is temperature difference at both ends. If the temperature of one end of the water tank is obviously lower than that of one end of the water outlet of the engine cylinder head, the utility model can be used to repair or replace the thermostat.
If the two ends of the temperature of the thermostat, touch the radiator and the engine body or water-cooled oil radiator shell, if the temperature of the radiator is obviously lower than the engine, the lack of water pump or cooling fluid circulation, should observe the radiator outlet hose is deflated. Can also be removed under the water inlet hose to check the situation of the water, if the starter with the crankshaft rotation, strong water, indicating that the water pump foot. Otherwise check the pump or radiator.
Check the radiator Baotou North heavy truck parts can be used to touch the upper, lower, left, right. If the temperature is found to be uneven, indicating that the foreign body in the heat pipe or scale blockage, should be removed.
The above tests were normal, the engine is still overheating, should consider whether there are other issues, such as whether the vehicle is overload _ low speed work for a long time, whether the luff, if injection time too late, should treat the specific. When the first two reasons are excluded, the fuel injection time should be adjusted.