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TM 10-6640-233-10 h. The Blotter Test is used to determine the insoluble contaminants, dispersant ability, and alkalinity of used oil from diesel engine samples. This test is performed by placing one drop of used oil in the center of an oil print filter circle. The oil  spot  is  allowed  to  develop  for  15  minutes,  and  the  resulting  spot  is  evaluated  for  total  contaminants,  cooling contaminants, and dispersant effectiveness. An alkalinity indicator is added to the spot and, after one or two minutes, the alkaline reserve is determined from the color ring that develops. i. The  Flash  Point  Tester  is  used  in  determining  the  percentage  of  fuel  dilution  in  used  oil  samples  from  diesel engines. j. The Microscopic Analysis Test is used to determine wear and contamination of suspect spectrometric oil samples from aircraft components as relates to the components condition. This is accomplished by placing a few milliliters of the suspect  oil  sample  in  a  test  tube  and  mixing  with  solvent.  This  mixture  is  then  filtered  through  a  .01  45u  (Micron) membrane filter. The remaining insoluble debris and filter membrane are carefully rinsed with solvent to remove oil and then  allowed  to  air  dry.  The  dry  membrane  is  transferred  to  a  petri  slide  and  the  debris  examined  under  a  low-power microscope. The debris are identified as to type of wear metal with respect to wear and contamination. k. Ferrographic  analysis  is  currently  performed  on  selected  aeronautical  components  (i.e.,  AH-l  swashplates  and Scissors & Sleeves Assembly) as a supplement to spectrometric analysis. 1-34


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