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Cummins diesel engine thermostat / thermostat / thermostat physical map and parameter model is for reference only: please contact our sales online customer service for specific price models,
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1.The role of the thermostat of Cummins diesel engine
The amount of water entering the radiator is automatically adjusted according to the temperature of the cooling water of the Cummins diesel engine, and the circulation range of the water is changed to adjust the cooling capacity of the cooling system to ensure that the engine works in a suitable temperature range. It is installed in the return pipe in the cooling system.
2. Type of thermostat of Mings diesel engine (by temperature)
The thermostat is divided into three types of thermostats: high, medium and low temperature. The opening temperature of the high temperature thermostat is 82-91 C °.
The opening temperature of the intermediate temperature thermostat is 77-85 C °,
The opening temperature of the cryostat is 71-79 C °.
Most Cummins engines are equipped with low or medium temperature thermostats. (The normal water temperature of Cummins engine is between 74-93)
3.The temperature control of the thermostat of the Mings diesel engine
Low temperature thermostat
71-79 C °
Medium temperature thermostat
77-89 C °
High temperature thermostat
82-91 C °
Components and maintenance of Cummins M11 diesel engine cooling system
1. The function of the cooling system: When the engine is operating, due to the combustion of the fuel, the temperature of the parts (such as the cylinder head, cylinder head, piston, valve, etc.) that are in direct contact with the high temperature gas rises. Without proper cooling, the engine cannot be guaranteed Normal operation, so set the cooling system. The amount of heat taken away by the cooling tie should be modest. Insufficient cooling and engine overheating will result in reduced cylinder charge and abnormal combustion, and engine power will decrease; engine parts will also become thinner due to heat, which will result in poor lubrication and accelerated wear and tear, and even cause machine parts to become stuck (some parts have clearance (Small stuck after thermal expansion) and destroyed.
Excessive cooling will also cause harm. Too much heat taken away by the cooling water will reduce the thermal efficiency and incomplete combustion in the cylinder. If the diesel engine temperature is too low, the work will be rough; the function of the cooling system is to keep the engine working in the most suitable temperature range.
2. Cooling method: Cummins diesel engine adopts water cooling method, the heat is first transferred to the water by the parts, and the heat is taken away by the flow of water, and then dissipated into the atmosphere. After the heat is radiated, the water flows back to the heated parts again, and the water circuit and cooling intensity can be properly adjusted to maintain the normal operating temperature of the engine. At the same time, the engine can also be preheated with hot water to facilitate winter starting.
Why install a thermostat?
The cooling intensity of the forced water cooling system is generally affected by the speed of the vehicle, the speed of the crankshaft, the water pump and the fan, and the outside temperature. When the use conditions change, such as high outside air temperature, the engine works at low speed and heavy load, and the cooling intensity is required to increase, otherwise the engine is prone to overheating. When the outside air temperature is low and the engine load is not heavy, its cooling intensity should be weakened, otherwise the engine will be too cold. Therefore, to ensure that the engine works at the optimal temperature without overcooling and overheating, it is necessary to automatically adjust the engine cooling intensity according to changes in the use conditions. At this time, you need to install a thermostat.
The function of the thermostat is to automatically adjust the amount of water entering the radiator to adjust the cooling intensity.
Diesel engine uses wax thermostat.
The thermostat is installed in the thermostat body at the water outlet of the cylinder head to adjust the amount of water entering the radiator. It can accelerate the warm-up process after the engine has started at a low temperature.
Thermostat working principle
The upper bracket and the lower bracket of the thermostat are integrally riveted with the valve seat. The upper end of the center rod is fixed at the center of the upper bracket, and the lower portion is inserted into the center hole of the rubber tube, and the lower end of the center rod is tapered. The cavity between the rubber tube and the housing of the inductor is filled with paraffin wax. The upper and lower parts of the casing are linked with the main valve and the bypass valve. When the main valve is completely closed, the passage of the cylinder head water outlet pipe is blocked. Therefore, a vent hole is opened in the main valve. Its function is to make the water jacket The air is discharged through the small holes to ensure that it can be filled with water.