Figure 5-2.  Air Compressor Air Filter e. Care should be taken when either cleaning or assembling oil pan so that the seal is not harmed. f. Clean  mesh  in  filter  using  a  hot  water  and detergent   solution   per   Federal   Specification   P-D-220. Allow mesh to air dry. g. Fill  oil  container  to  mark  with  clean  engine oil.   Refer  to  LUBRICATION  (Section  V)  and  Table  5-3. Install oil container on air filter housing. h. Remove rain cap from air intake and clean dirt from air intake tube.  Replace rain cap. 5-7. Dehydrators and Air Purification Cylinders.  (See Figure  5-4  and  Figure  8-2).    The  cartridges  and  filter elements    shall    be    changed    in    accordance    with    the number  of  recorded  operating  hours.    (See  Table  5-2.) To    change    the    cartridges    on    cylinders,    proceed    as follows: WARNING Make   certain   that   all   air   pressure   has been  relieved  from  the  compressor  air supply system by opening the SERVICE HOSE Figure 5-3.  Engine Air Filter BLEED VALVE, DEHYDRATOR BLEED VALVE and MECHANICAL FILTER DRAIN VALVE. a. Using   a   strap   wrench,   unscrew   cylinder caps from either dehydrators or air purifications cylinders. CAUTION Do not interchange cartridges/filters between cylinders, or reuse cartridges/filters. b. Remove cartridges from cylinders, thoroughly clean the inside of the cylinders with a lint free cloth using hot water and detergent solution per Federal Specification P-D-220.  Allow cylinder to air dry. c. Examine  o-rings  in  the  cylinder  caps  and replace  if  damaged.    Use  AN6227B-35  or  AN6227B-36 o-rings. d. Remove and discard cartridges in dehydrator cylinders. f. Place   fresh   type   MA-2   cartridge   in   both dehydrator  cylinders  (cylinders  I  and  2)  (see  Figure  5-4 and Figure 8-2). 5-5