Small circulation means that after the cooling water flows out of the body, most of it does not flow through the water tank for heat dissipation. heat and cool, then enters the body to cool the engine. The condition is that the water temperature is below 70 degrees. In the small cycle, when the engine water temperature is lower than 76 degrees Celsius, the main thermostatic valve is closed, the bypass valve is opened, and the cooling water channel from the cylinder head to the radiator is cut off.
Performance of the Cummins 4B engine stuck in small cycle
The cooling water flows from the water jacket of the cylinder head and enters through thermostat bypass valve and bypass pipe. Water pump and sent to the water jacket of the cylinder block through the water pump. Since cooling water does not dissipate heat throughtowards the radiator, the engine temperature can increase quickly. This method of circulation is called a small cycle. Air is mixed into the generator's cooling system, causing the pipeline to block. Damage to the suction valve and exhaust valve of the expansion tank will also directly affect circulation. , you should always check whether their pressure values meet the requirements. It is stipulated that the suction pressure is 10 kpa and the exhaust pressure is 40 kpa. In addition, the smoothness of the exhaust pipe is also an important factor affecting circulation.
Cummins generator coolant level is too low or not within regulations. Too low a fluid level can directly cause an increase in coolant temperature and prevent coolant circulation. freezein accordance with regulations. Add 50% deionized water to the liquid and add DCA4. If it does not meet the regulations, it will cause pipeline blockage and rust in the pipe wall, which will prevent the coolant from circulating normally if the diesel generator. The water pump fails, check if the water pump is working well. If the water pump driveshaft is found to be worn beyond the limit, it means that the water pump can no longer operate and must be replaced before the cycle can be performed. normal.