Military Symbol
9110
Temperature (°F)
140
9170
160
9250
175
9500
180
MAINTENANCE OF PURIFIERS
Pressure should not be increased above normal to
force a high viscosity oil through the purifier. Instead,
the viscosity should be decreased by heating the oil.
Pressure in excess of that normally used to force oil
through the purifier will result in less efficient
purification. On the other hand, a reduction in the
pressure that forces the oil into the purifier will increase
the length of time the oil is under the influence of
centrifugal force and, therefore, will tend to improve
results.
DISCHARGE RING (RING DAM)
If the oil discharged from a purifier is to be free of
water, dirt, and sludge and if the water discharged from
the bowl is not to be mixed with oil, the proper size
discharge ring (ring dam) must be used. The size of the
discharge ring depends on the specific gravity of the oil
being purified; diesel fuel oil, JP-5, and lubricating oils
all have different specific gravities and, therefore,
require different sized discharge rings. While all
discharge rings have the same outside diameter, their
inside diameters vary. Ring sizes are indicated by even
numbers; the smaller the number, the smaller the ring
size. The inside diameter in millimeters is stamped on
each ring. Sizes vary in increments of 2 millimeters.
Charts, provided in the manufacturers technical
manuals, specify the proper ring size to be used with an
oil of a given specific gravity. Generally, the ring size
indicated on such a chart will produce satisfactory
results. If the recommended ring fails to produce
satisfactory purification, you must determine the correct
size by trial and error. In general, you will obtain the
most satisfactory purification of the oil when the ring is
the largest size that can be used without losing oil along
with the discharged water.
Clean the bowl of the purifier daily according to the
PMS, and carefully remove all sediment. The amount of
dirt, grit, sludge, and other foreign matter in the oil may
warrant more frequent cleaning. If you do not know the
amount of foreign matter in an oil, have the purifier shut
down and examined and cleaned once each watch, or
more often if necessary. The amount of sediment found
in the bowl indicates how long the purifier may be
operated between cleaning.
Have periodic tests made to make sure the purifier
is working properly. When the oil in the system is being
purified by the batch process, tests should be made at
approximately 30-minute intervals. When the
continuous process of purification is used, tests should
be made once each watch. Analysis of oil drawn from
the purifier is the best method of determining the
efficiency of the purifier. However, the clarity of the
purified oil and the amount of oil discharged with the
separated water will also indicate whether the unit is
operating satisfactorily.
SUMMARY
This chapter covered the general procedures
concerning repairs, troubleshooting, maintenance, and
overhaul of internal combustion engines. Additionally,
it covered the general maintenance of jacking gear and
fuel and oil purifiers. Read and use the correct
references, such as the manufacturers manuals and the
PMS to operate and care for your equipment.
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