Oil Filter
Engine oil will be polluted by the parts
wearing particle and outer impurity which enters into the engines, also for
being subjected to heat radiation of the hot parts; it will be oxidized, and
produces acidic material which can dissolve in oil and colloidal deposit which
is not solube. These impurity arid contamination is very harmful to the
engines, if they are not be filtered, the hard particle in the oil will
accelerate parts to abrase, and jam the oil passage. The acidic material will
bring the corrosive abrasion of the alloy bearings. The colloidal deposit will
lead the pistons and piston rings and valves and valve stem guide to cement,
even the engine can not run, and shorten the oil drain interval. It is said
that if the total valve of the solid contamination in the oil is less than
0.15%, the harm to the engine is limited, if this valve is more than 0.5%, the
harm to the engine is very serious. Therefore, the oil filters should be
assembled in the lubrication system of the engine ALL
In addition to depend on the correct
selection and use of lubricating oil, the maximum life span of a diesel engine
also depends on the selection and use of the appropriate oil filter, fuel
filter, and the suitable replacement cycle.
Note: All Chongqing Cummins engines for a generator set are equipped with full
flow oil filter, bypass oil filter, and fuel filters.
Full flow oil filter
Full flow oil filter is also called primary
oil filter, mainly connecting between the oil pump and the lubricating main oil
channel, the purpose is to remove particulate pollutant. All the circulating
lubricating oil of the diesel engine is filter through it, so as to protect the
diesel parts from suffering a wear damage.
The element of this filter is made from
synthetic fibre filter paper, it can not be cob lapsed on high temperature and
high pressure and filter jamming.
There is a bypass valve in the filter head,
when the restriction arrives at or exceeds a pressure which is preconfirmed,
the oil will not pass the filter and flow the filter head to the main rifle
directly, so that there are sufficient oil to lubricate the engine’s parts.
There is a alarming equipment in the filter
head in some engines, when the restriction arrives at or exceed a pressure
which is pre-confirmed, it can give a alarming signal to the alarming amp which
can remind the driver to replace the oil filter A.S.A.R.
There are some jamming types about the oil
filter:
a. The filter is polluted unduly. When the
carbon deposit and oxid and burning by
product in the engine oil exceed the limit that the oil can absorb, this will
appear. It may be the primary reason for that the oil drain interval is very
long and the maintenance or service is very bad, or the blow by is very high.
b. The ability that the oil disperses the
deposit is weakened. When the coolant leaks into the oil pan, the humidity will
be formed, the humidity will weaken the dispersing ability of the oil, this
will cause the lampblack and charry dust to agglutinate and deposit. It is the
primary reason for the coolant leaks into the oil pan and engine idles for long
time at cold status.
c. The additives separate from the oil. The
additives will separate from the oil for coolant or humidity in the oil, this
will cause jam.
a) Gel and latex. When the oil has been
polluted by the coolant, these things will form in the oil.
b) Oxid. When the oil is diluted and the oil
is eradiated by the high temperature, the oxid will form in the oil.
c) Abrasion material. These things are caused
by the triturate and the dust in the lubrication system.
Note: Full flow oil filter must always be
used with bypass filters, but a bypass filter can not be used to instead of a
full flow oil filter.
Bypass oil filter
This filter will filtrate out those granules
which can not be percolated by the fad flow oil filter. Because the oil flow
which passes the filter is very small. It is allowable that the restriction of
this filter may be greater than the full flow oil filter. Granule dimension
after filtrating by bypass oil filter is between 0.005mm and 0.010mm.
Some customers think that the full flow oil
filter has seen assembled on the engine, it is not necessary to use the bypass
oil filter again. At the same time, they consider the using cost will increase
if the oil filter is replaced by a new one after the engine runs for 250 hours
or 6 months or 16000 kilometers, therefore, they don’t replace the filter. It
is proven that when the engine only use furl flow oil filter, the abrasion of
the engine’s parts are very serious, when the engine use fuill flow and bypass
oil filters, the abrasion of the engine’s parts will be decreased observably.
The combo filter has the function of fill
flow oil filter and bypass oil filter.
Here, let me turn to talk about fuel filter
of the Cummins engine.
Fuel filter
There are two types fuel filters assembled on
Chongqing Cummins diesel generator, light duty and heavy duty fuel filter. The
light fuel filter is applied to those engines. Whose power is below 700HP. The
heavy duty one is applied to those engines whose power is above 700HP. After
the filter have been used for a period of time, the filter will be contaminated
and jammed, it must be replaced termly. The interval of the oil and fuel
filters can be determined by the consumption curve of the oil and fuel, also,
it is recommended that the oil and fuel filter are replaced every 250 hours,
16000 kilometers or 6 months.
The methods for replacing the filters can be
seen on the filter.
For fuel/water separator, the user can dram
the water from the separator by turning on the drain valve. When you estimate
that the water have been drained drastically, you can turn off the drain valve.
Corrosion resistors
One of the essentialities for maintaining to
the coolant system is to replace the corrosion resistor.
If the customer do not use the corrosion
resistor recommended by the engine manufacturer correctly, it will cause the
following problems:
a. The deposit will be formed on the surface
of the water pump and the cylinder liner;
b. the parts in the coolant system will be
eroded and abrased, and the thermostat will be jammed;
c. The tube of the oil cooler and radiator
and aftercooler and the coolant hose and passage will be jammed;
d. Greasy deposit will be formed on the
surface of which transmitting the heat of the engine.
The above problems are caused by the
followings in the coolant; sand, dirty, dust, oil dust, oil, mineral, corrosive
product, alterative and dissipative chemical additives and the chip of the
sealing. The coolant in the engine must be filtrated; the corrosion resistor is
a better filtration equipment. If you use corrosion resistor correctly, the
life of the engine and parts will be extended.
Note: When the engines are running, the
chemical additives in the coolant will be depleted and diluted gently so the
customers must check the concentration for the additives termly. The check
methods can be seen in the engines service bulletin.
When the corrosion resistor isn’t used or
needed to be replaced, the customer can turn the valves on the inlet and outlet
coolant tubes to the close position. When it will be needed to use, you can
turn the valves on the inlet and outlet coolant tubes to the full open
position.
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