1.
lubrication function
As long as the engine of the
generator set is operated, the internal parts will produce friction. The faster
the speed is, the more intense the friction will be. For example, in the piston
part, the temperature can be as high as more than 200 degrees Celsius. If there
is no oil in the diesel generator, the temperature will be high enough to burn
the whole engine. The first function of oil is to use oil film to cover the
internal metal surface of the engine to reduce friction between metals.
2.
Thermolysis
Besides the cooling system, the engine oil is
also an important role in the heat dissipation of the generator set, because
the oil flows through the engine and can take away the heat generated by
friction between the parts of the engine and the piston which is farther away
from the cooling system. Some cooling effects can also be obtained through oil.
3.
Anti-corrosive and anti-rust function
After running for a period of
time, the engine oil naturally produces various corrosive oxides more or less,
especially the strong acid in these corrosive substances, which is more likely
to cause erosion to the internal parts of the engine, and at the same time, to
burn the moisture generated by the combustion. Although most will be taken away
with the exhaust gas, there is still a little moisture residue, which can
damage the engine. So the additives in the oil have the function of preventing corrosion
and rust to protect the generator engine from these harmful substances.
4. Cleaning
function
The carbon generated by the
long-term operation of the generator set and the residue remaining from the
combustion will attach to the internal parts of the engine, and if not properly
treated, it will affect the function of the engine, especially in the piston
rings and inlet and exhaust valves, etc. It creates carbon or adhesive
substances that cause detonation, frustration, and fuel consumption, all of
which are major enemies of the engine. The oil itself has a clean dispersion
function, so that the carbon and residue do not accumulate in the generator
set, so that they form small particles, but suspended in the oil.
5. Seal
function
Although there is a piston ring
between the piston and the cylinder wall to provide sealing, because the metal
surface is not very flat, the sealing degree will not be very good. If the
sealing effect is not good, the engine power of the diesel engine will be
reduced. Therefore, oil can produce film between metals, provide good sealing
effect, and improve the efficiency of generating set.
The oil quality of diesel
generator sets will directly affect the operation of the generating set. The
choice of high quality oil and the correct use of oil can bring into play the
technical performance of the oil, ensure the normal operation of the diesel
generator set and prolong the life of the diesel generator set.
Specification
of diesel oil
In order to ensure the
lubricating performance at high temperature, at the same time to improve the
low temperature starting performance and reduce the oil consumption, the
multistage viscosity oil is recommended for the D114 Series B diesel engine.
The ambient temperature range of diesel engine oil with different viscosity
grades is different.
Note: diesel engine oil of
appropriate viscosity level should be selected according to local ambient
temperature.
For most parts of our country, we
recommend the use of 15W/40CF-4 oil. If the ambient temperature is lower than
-15 ℃, in order to start and supply
enough oil, we can choose 10W/40CF-4 oil.
In severe cold areas, if the
diesel generator set has been operating below -23 ℃ and there is no heating measure after the
diesel engine stops running, the 5W/50SJCF-4 engine oil with sufficient low temperature
characteristics should be selected.
Note: although low viscosity
engine oil is helpful to start of diesel generator set, because of wear and
tear, the life of diesel generator unit will be shortened if it is used
continuously, so we should try our best to avoid or restrict the use of diesel
generator set.
The use of inferior oil will
cause excessive oil consumption, early wear and tear, and even various serious
troubles such as cylinder pulling.
Oil
deterioration and oil replacement period
After being used for a period of
time, the oil deteriorated due to the oxidation of oil at high temperature,
road dust, sand, worn metal particles, combustion by-products and unburned
fuel, which resulted in the deterioration of oil products and the decrease of
lubricating and cooling effects. Oil must therefore be replaced regularly.
In general (users with no
conditions for oil testing), oil should be replaced for 350 hours of operation
of diesel generator sets, and oil should be replaced for 250 hours in high
dust, high altitude and high cold environments.
Note: please do not extend the
oil replacement period, due to corrosion, carbon deposition and wear and other
reasons, extended replacement period will shorten the life of diesel generators.
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