Military Symbol9110Temperature (°F)140917016092501759500180MAINTENANCE OF PURIFIERSPressure should not be increased above normal toforce 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 oilthrough the purifier will result in less efficientpurification. On the other hand, a reduction in thepressure that forces the oil into the purifier will increasethe length of time the oil is under the influence ofcentrifugal force and, therefore, will tend to improveresults.DISCHARGE RING (RING DAM)If the oil discharged from a purifier is to be free ofwater, dirt, and sludge and if the water discharged fromthe bowl is not to be mixed with oil, the proper sizedischarge ring (ring dam) must be used. The size of thedischarge ring depends on the specific gravity of the oilbeing purified; diesel fuel oil, JP-5, and lubricating oilsall have different specific gravities and, therefore,require different sized discharge rings. While alldischarge rings have the same outside diameter, theirinside diameters vary. Ring sizes are indicated by evennumbers; the smaller the number, the smaller the ringsize. The inside diameter in millimeters is stamped oneach ring. Sizes vary in increments of 2 millimeters.Charts, provided in the manufacturers’ technicalmanuals, specify the proper ring size to be used with anoil of a given specific gravity. Generally, the ring sizeindicated on such a chart will produce satisfactoryresults. If the recommended ring fails to producesatisfactory purification, you must determine the correctsize by trial and error. In general, you will obtain themost satisfactory purification of the oil when the ring isthe largest size that can be used without losing oil alongwith the discharged water.Clean the bowl of the purifier daily according to thePMS, and carefully remove all sediment. The amount ofdirt, grit, sludge, and other foreign matter in the oil maywarrant more frequent cleaning. If you do not know theamount of foreign matter in an oil, have the purifier shutdown and examined and cleaned once each watch, ormore often if necessary. The amount of sediment foundin the bowl indicates how long the purifier may beoperated between cleaning.Have periodic tests made to make sure the purifieris working properly. When the oil in the system is beingpurified by the batch process, tests should be made atapproximately 30-minute intervals. When thecontinuous process of purification is used, tests shouldbe made once each watch. Analysis of oil drawn fromthe purifier is the best method of determining theefficiency of the purifier. However, the clarity of thepurified oil and the amount of oil discharged with theseparated water will also indicate whether the unit isoperating satisfactorily.SUMMARYThis chapter covered the general proceduresconcerning repairs, troubleshooting, maintenance, andoverhaul of internal combustion engines. Additionally,it covered the general maintenance of jacking gear andfuel and oil purifiers. Read and use the correctreferences, such as the manufacturers’ manuals and thePMS to operate and care for your equipment.3-47
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