The use of the coolant in the cooling system is to
prevent corrosion and formation of scale in the cooling circuit and within the
engine. We should never use water alone, as a coolant in diesel engines since
water itself can be corrosive at high operating temperatures.
The use of coolant in diesel generator solves the
problems of poor cooling and high temperature of the diesel generating set.
Usually, we should replace the cooling liquid every one and a half years to two
years. The standard replacement cycle of the cooling liquid will be very
helpful for the genset protection. It can form a protective film on the surface
of cylinder sleeve of the generator set so as to prevent the occurrence of
cavitation and reducing wear and corrosion, which can prolong the maintenance intervals
of the genset and reduce the maintenance cost.
On the contrary, non-replacement for a long time, it will definitely reduce the
using effects. So what problems should be paid attention to in the process of
using diesel generator coolant?
Coolant selection: Select clean fresh water such as rainwater, tap water and
river water. The well water and underground water (Hard water) shouldn’t be
used directly, because they contain more minerals, which is easy to form
limescale in the water tank of diesel engine, influence the cooling effect and
even result in malfunction. If there is only hard water, it must be light
softened before using. The softening method usually refers to the boiling
method. Boil the water, add 0.67g caustic soda to per liter of water, and use the
upper water after precipitation.
Cool the
diesel engine with seawater is not allowed
When the
diesel engine is used below 0°C, it should prevent the coolant freezing since it
may cause the cracking of
relevant parts. Therefore, when
the diesel engine finishes running, the cooling liquid of each parts should be
discharged.For adopting the models of closed cycle cooling system, it can be
equipped with appropriate antifreeze coolant according to the local minimum
ambient temperature.
The formula of commonly used antifreeze coolant is as
follows:
When equipped with the flammable antifreeze coolant, you
should pay attention to fire safety since both ethylene glycol and alcohol are
inflammable materials. Before using antifreeze coolant, the dirt in the cooling
system should be cleaned to prevent the production of new chemical
precipitates, which will affect the cooling effect. For the diesel generator
that used the antifreeze coolant, it is not necessary to let out the coolant
every time after stopping, but it should be regularly added and check the
composition.
Do not use 100% antifreeze as coolant
If there is much limescale and dirt in the cooling system
of diesel engine, clean it with cleaning solution. The cleaning solution can be
made from water, soda water(Na2CO3) and water glass (Na2SiO3). Namely, add 40g
soda water and 10g water glass to each liter of water. When cleaning, pour the
cleaning solution into the cooling water chamber of the diesel engine. Drive the
diesel engine to operate, when the outlet water temperature is greater than 60°C, continue to run for about two hours and
then parking, and release the cleaning solution. After the diesel engine is cooled,
wash it with clean fresh water
for two times, drain and pour into the cooling water and drive the machine to
operate again. When the outlet
water temperature reached 75°C, parking and release the sewage, after
that, inject new cooling water.
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