The 24 solar terms of the lunar calendar have passed. As the saying goes, the lunar calendar is full of breath, which means that the land has been completely converted and the work can be started. For the north, this is also the time for many projects to start. At this time, the temperature has also risen, in the iron armour forum began to appear on the water temperature, oil temperature, thermostat posts. Today, let's talk about the thermostat briefly.
Fault diagnosis method of the thermostat
In the iron forums, there are many posts about the high water temperature, and the topics about the temperature of the water are not a few. Today we are going to talk about thermostat fault diagnosis. Before we talk about the thermostat fault diagnosis method, let's first understand the thermostat briefly.
Principle of thermostat
The thermostat adjusts the amount of water that enters the radiator automatically according to the change of the temperature of the coolant, and also changes the circulation range of the water, which is the "large cycle" and "small cycle" which we often say. In this way, the cooling capacity of the cooling system can be adjusted, thus ensuring that the engine works in the proper temperature range.
Performance after the failure of the thermostat
Generally, problems with thermostat will result in too late or premature opening of the main valve. If it is too late, it will cause the engine to overheat; if it is opened too early, the engine preheating time will be prolonged, and the engine temperature will be too low to affect the efficiency. In short, after the failure of the thermostat, the water temperature is high or the water temperature is low.
The method of judging the fault of the thermostat
The fault of thermostat is usually diagnosed by experience. How to judge the malfunction of thermostat? Then the author introduces several methods.
One, the check after the engine is started.
First, open the lid of the cooling water tank and see if there is water flow in the cooling water of the cooling water tank. If there is no flow phenomenon, it is indicated that the thermostat has been damaged or there is a foreign object stuck between the main valve switches.
Two, the engine will be inspected after working for a period of time.
When the water temperature meter indicates less than 70 C, see if there is water flow at the inlet pipe of the radiator. If the water temperature is hot, it may be the large circulation of the cooling water too early. At this time, the main valve of the thermostat may be shut down.
When the water temperature is higher than 80 degrees Celsius, look through the water tank cover to see if the water flow, if there is no flow indicating that the thermostat fault, need to be replaced.
Three, observe the water temperature meter to see if the water temperature meter is abnormal.
When the water temperature is less than 80 degrees, the water temperature meter usually rises rapidly at the beginning of the operation of the engine. When the water temperature is higher than 80 degrees, the speed of the pointer moves slower, indicating that the thermostat is normal. If the water temperature has been rising rapidly, especially when the pressure in the water tank reaches a certain degree, the boiling water suddenly spills, which indicates that the main valve has a stagnation or the failure of the thermostat.
Four, the way to feel the water temperature by hand.
Open the radiator to add water cover and waterproof switch, use hand to feel the temperature of the coolant, if hot, it indicates that the temperature is normal; if the water temperature of the water inlet is low, there is no cooling fluid in the water inlet of the radiator and the outflow is very little, it indicates that the main valve of the thermostat has a problem, and it should be repaired in time.
In the armour forum, many netizens have introduced the introduction of thermostat. Let's take a look.
It is a small cycle and a large circulation switch. When the temperature of the engine is lower than the temperature of the thermostat, it closes the large circulation and opens the small cycle to make the water temperature of the engine rise rapidly so that the temperature of the engine can reach the normal operating temperature. When the water temperature reaches the opening temperature of the thermostat, the thermostat opens, part of the hot water is cooled through the large circulation, part through the small circulation. When the temperature rises to the full thermostat, the small cycle closes and the large cycle opens to maintain the water temperature in the normal operating temperature range of 70 to 90 degrees. After removing the thermostat, in summer, a part of the water does not pass the large circulation heat to make the engine overheat. In winter, the engine water temperature is difficult to rise rapidly because of a part of the water circulation, the engine works at low temperature for a long time, and the engine is unfavorable.
A friend of tea 6: if you remove the thermostat, you'd better block the small circulating water. Otherwise, circulating water may take part in a small cycle, causing high temperatures. Generally speaking, removing the thermostat can reduce the water temperature. But the northern winter engine heating speed will be very slow, poor preheating, the engine will work for a long time at low temperature, accelerating machine wear. The South can be demolished in summer, but it should be blocked up in small cycles and cold weather should be installed; the North should not be demolished.
