In actual use, there is a wrong understanding that the lower the coolant temperature of diesel generators, the better.In fact, we have clear requirements for the use of diesel engine coolant temperature. Some operators like to adjust the coolant temperature very low. Some are close to the lower limit of coolant temperature orlower than the limit of coolant temperature.They believe that if the coolant temperature is low, the water pump will not have cavitation, the coolant will not be interrupted, and there is a safety factor in use. In fact, as long as the coolant temperature does not exceed 95°C, no air pockets will appear and the coolant will not be interrupted. On the contrary, if the coolant temperature is too low, it will be very harmful to the engine.
As the viscosity of the oil in the lubrication system increases, the running resistance of the parts increases,resulting in poor lubrication and increased wear between parts. For example, when the coolant temperature is 30°C, compared with the coolant temperature of 80 to 90°C, the wear of the cylinder liner, piston and piston ring will increase about 5 times.
Low coolant temperature could worse the combustion conditions in diesel engine cylinders, poor fuel atomization, prolonged afterburn period andrough diesel engine operation.Which will increase the damage of curved bearings, piston rings and other parts, reducing power and economy.
The burned water vapor is easy to condense on the cylinder wall, causing metal corrosion.
Unburned diesel will dilute the oil and cause poor lubrication.
Incomplete combustion of fuel will form gums, which will cause the piston ring to get stuck in the piston ring groove, and the valve will get stuck.When the compression ends, the pressure in the cylinder will decrease.