Why My Diesel Generator Water Temperature Is High
by Starlight Generator dieselgeneratortechExcessive water
temperature is one of the most common failures of diesel water-cooled type. Due
to the different thermal expansion coefficients of the cylinder sleeve and
piston friction pair material, the high temperature will make the gap smaller,
the lubrication condition will deteriorate, and the cylinder and piston ring
will be stuck for a long time. In addition, if the water temperature is too
high, the viscosity of the lubricating oil will decrease, and the oil film will
be destroyed to reduce the lubricating effect and the dynamic performance.
Therefore, the diesel generator water temperature must be controlled to the
allowable value. There are nine main reasons for the excessive water
temperature in diesel engines.
1. Improper use of
coolant or insufficient water. The diesel engine used in construction machinery
generally has a higher working temperature. The antifreeze can ensure its high
boiling point and reduce the scale generated by the cooling system. If the
cooling system is not removed, or the coolant is not replenished in time, the
cooling performance will be degraded. To raise the temperature of the coolant.
2. The water radiator is
blocked. For example, the heat sink of the water radiator has a large area of
lodging, and there are oil and mud debris between the heat sinks, which will
prevent the heat from being emitted. Especially when the surface of the water
radiator is contaminated with organic oil, the thermal conductivity of the
sludge mixture formed by the dust and the oil is smaller than that of the
scale, which seriously hinders the heat dissipation effect. At this point, use
a thin steel sheet to carefully return the heat sink to its original position,
restore the flat shape of the heat sink, and then use compressed air or a water
gun to clean it. If the water is heated and put into the cleaning solution,
sneeze, the effect is better.
3. The water temperature
gauge or warning light is incorrectly indicated. Including the water
temperature sensor is damaged; the line is ironed or the indicator is out of
order, resulting in false alarm. At this time, the surface thermometer can be
used to measure the temperature at the water temperature sensor, and it is
observed whether the water temperature gauge indicates the actual temperature.
4. The fan speed is too
low, the blade is deformed or reversed. If the fan tape is too loose, it will
slip, causing the fan speed to be too low and the air supply effect to be
weakened. If the tape is too loose, it should be adjusted. If the rubber layer
is aged, damaged or the fiber layer is broken, it should be replaced. When the
fan blade is deformed, it can be compared with the new blade of the same
specification to see if the angle between the blade and the relative rotation
plane becomes smaller. If the angle is too small, the air supply strength will
be insufficient.
5. The cooling water
pump is faulty. The pump itself is damaged, the rotation speed is too low, the
scale in the pump body is excessively deposited, and the narrowing of the
passage will make the flow rate of the coolant smaller, the heat dissipation
performance is lowered, and the temperature of the diesel engine oil is
increased.
6. The thermostat is
faulty. The function of the thermostat is to control the size cycle of the
cooling system. When the thermostat is working at about 85 degrees, the valve
starts to open, and the valve is fully opened at about 105 degrees. The method
of checking the thermostat is to remove the thermostat, suspend it in a
container filled with warm water, and place a thermometer in the water, then
heat it from the bottom of the container to observe that the thermostat valve
starts to open and If the water temperature is completely turned on, if the
above requirements are not met or there is obvious damage, the thermostat
should be replaced immediately.
7. The cylinder head
gasket is damaged. If the cylinder head is burned by the high temperature gas,
the high pressure gas will rush into the cooling system to make the coolant
roll and boil. The method of judging whether the cylinder head is burnt is:
turning off the diesel engine, waiting for a while, then restarting the diesel
engine and increasing the speed. If at this time, the water radiator cap can be
seen to have a large number of bubbles emerging, and at the same time, there is
a small water droplet in the exhaust pipe discharged with the exhaust gas, it
can be concluded that the cylinder head gasket is damaged.
8. Inappropriate fuel injection time. The injector is not working well. If the fuel supply advance angle is too early or delayed, the contact area of the high temperature gas with the cylinder wall increases during combustion, and the time is prolonged, and the heat transferred to the coolant increases, and the temperature of the coolant rises. At this time, there is a phenomenon that the power of the diesel engine is lowered and the fuel consumption is increased. If the fuel injection pressure of the injector drops, the fog will be poor, and the fuel will not be completely burned. The increase of the exhaust temperature will indirectly lead to an increase in the water temperature.
9. The electric generator is
overloaded. When the diesel engine is overloaded, it will cause too much oil
supply. When the generated heat exceeds the heat dissipation capacity of the
diesel engine, the temperature of the coolant of the diesel engine will also
rise. At this time, the diesel engine has more black smoke, increased fuel
consumption, and abnormal sound.
Sponsor Ads
Created on May 5th 2019 22:19. Viewed 403 times.