Chemical Analysis for Metals in Lubricating oils

These methods of chemical analysis are intended  for the  determination of barium, tin, silica, zinc, aluminum, calcium, magnesium, sodium and potassium in  new  and used  lubricating  oils. Other metallic elements, sulfur, phosphorus and  chlorine in  amounts  commonly  found  in lubricating  oils  do not  interfere in this  method.

Essentially,  the  method  consists  of  igniting  the sample, dissolving  the  residue  in  mineral acid and  then  separating  the various  metals by  conventional  methods.  

Diesel Locomotives –tractions Gear-Lubrication

Most traction gears on diesel locomotives are lubricated with high viscosity, adhesive gear oils. Residuum  type products  with  viscosities    as  high  as 500 Furol  at  210 degree F    have  been  used, but  in most  cases  a viscosity  of  2000 SUS at 210 degree F is  satisfactory. About  fifteen  pounds is  required  for an  initial  fill  and  since there  is  some  leakage,  the  gear  case  should  be  checked and refilled at  least  every  month. U.S. specification MIL-L-13914 (ORD) provides for two  grades of such oil, one  with  a viscosity  of 170 to 240  Say bolt  Furol  at 210 degree F and  the other  with a similar  viscosity of  480 to 580. A lubricating  greases is  recommended for the  purpose by  Morway  and  Ball^38  in which  the  thickener  is a  complex  sodium  soap  and the fluid is a mixture of  14.93 parts of a  low  cold  test oil  having  a  viscosity of 55  SUS at  210 degree F  and 75 parts of a  resin  from a Pennsylvania  oil  having a  viscosity  of  14,000 SUS at  210 degree F. When  such a  lubricant was used  in a  locomotive  in  freight  service  it did  not  leak  from  the gear  case, and  after  one  year  of  service there  was  only  slight  wear  on the  pinion  and driving  gear  teeth.