To judge whether there
are three blockages in Perkins diesel generator, the inspection method is to remove all
high-pressure fuel pipes from the injection pump. One person plays the starter
to drive the diesel engine and the injection pump to run. One person observes
the oil discharge situation at the outlet valve of the high-pressure pump, and
can easily distinguish the three kinds of blockage situation.
1.If the diesel engine
can supply oil normally, while before disassembly, diesel engine operates
unstable, it can be judged as water blockage, the main reason is that too much
water in diesel oil, so that makes the engine unstable or unable to work.
2.If a lot of bubbles
come out, while before disassembly, Perkins diesel engine can not work or
unstable work, it can be judged as air blockage, the main reason is that there
is air in diesel engine, so that diesel engine can not work.
3.If there is not oil
supply, or supply little oil, it can be judged as foreign body blockage. In
winter, it can be judged as ice blockage, mainly because foreign bodies or ice
blocked the oil intake pipeline, making the engine unstable or unable to work.
Air
blockage and elimination method
When the air bubbles
from the oil outlet valve, it is judged that there is the air blockage fault in
the engine fuel supply system, the starter can be continued to hit until the
air in the pipeline is exhausted, indicating that the pipeline is not damaged
and the engine can work normally.
If during hitting the
starter, there is always air exhausted, indicating that there is a leak in the
oil supply pipeline. The method of eliminating air blockage is to find the leak
site, seal well to eliminate the leak, and then eliminate the air in the
system. If the air in the oil supply pipeline is blocked by evaporation of fuel
molecule into fuel vapor due to very hot weather and low air pressure, this is
a special case. People call it high temperature air blockage, this is another
case.
Foreign
body blockage and elimination method
When check out there is
no oil or less oil from the oil valve, foreign body blockage can be judged.
Check the blockage parts, you can use the method of hand oil pump to continue
to check, when pulling the handle of the hand oil pump feel great resistance,
can focus on inspection of fuel supply pipeline from fuel tank to hand oil
pump, the blockage may be at the inlet of the fuel pipe in the fuel tank,
foreign matter in the fuel tank blocked the oil inlet, the blockage part maybe
is fuel filter, impurities or colloids in the fuel block the filter
If the resistance is
greater when pushing the hand oil pump, can focus on checking the oil supply
pipeline from the hand oil pump to the high-pressure pump. The blockage may
occur in the fine fuel filter.
The way to check whether
the centrifugal oil filter is working properly is to monitor the
"buzz" of the diesel engine when its rotor continues to rotate just
after shutdown. If the sound is working normally for a long time, if the sound
of rotation is not heard, indicating that the fault occurs.
When check ice blockage
fault, it must be in Winter, maybe there is water in diesel oil. Common ice
blockage fault part is in pipelines and fittings, the situation is more
complex, warm pipeline, melting and freezing, if the pipeline is naturally
open, it is not necessary to find the exact location of the ice blockage. After
removing the foreign matter blockage, the fuel supply system should also be
thoroughly cleaned, even the fuel tank should be cleaned. In order to prevent
material resistance, attention should be paid to long-term injection of clean
fuel oil in fuel tank.
Water
blockage and elimination method
When the diesel engine
is not stable enough, there is a fire phenomenon, even when the engine stops
suddenly during operation, it can be judged that the diesel engine is blocked.
Observing the exhaust pipe will find that the exhaust pipe continuously emits
white smoke. When the exhaust pipe receives water droplets or drips more, the
water blockage fault of the diesel engine can generally be judged.
Water blockage means
that there is water in fuel supply system and fuel tank. If can sure water
blockage fault, should release water and oil which in bottom, and the engine
should be started continuously by the starter to see if the water blockage
fault can be eliminated. If it can not be removed, all remaining fuel should be
discharged, and the fuel tank and fuel supply system should be thoroughly
cleaned, and the fuel filter (core) should be replaced. After that, should pay
attention to the addition of clean and anhydrous fuel and the possibility of
water entering the fuel system should be excluded. The performance of water
blockage is complex, which should be distinguished from the difficult faults of
diesel engines such as leakage of combustion chamber. For example, the damage
of the cylinder gasket leaks into the combustion chamber, and the moisture is
discharged from the exhaust pipe. The diesel engine also works unsteadily.
According to the degree
of water leakage and the number of cylinders, the amount of drainage is
different, and the working condition of diesel engine is also different.
Therefore, it is necessary to apply experience and judge comprehensively
according to many factors, such as engine operating time, common working
conditions, medium consumption and so on.
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