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TM 5-4210-233-14&P-1 5-38.  AIR DRYER-Continued (2)   Inspect the interior and exterior of ail metal parts that will be reused for severe corrosion, pitting and cracks.  Superficial corrosion and/or pitting on the exterior portion of the upper and lower body halves is acceptable. (3)   Inspect  the  bores  of  both  the  end  cover  (32)  and  the  purge  valve  housing  (31)  for  deep  scuffing  or gouges. (4)   Make certain that all purge valve housing and end cover passages are open and free of obstructions. (5)   Inspect the pipe threads in the end cover (32).  Make certain they are clean and free of thread sealant. (6)   Inspect the purge valve housing (31) bore and seats for excessive wear and scuffing. (7)   Inspect the purge valve piston seat for excessive wear. (8)   Inspect all air line fittings for c6rrosion.  Clean all old thread sealant from the pipe threads. (9)   All O-rings removed should be discarded and replaced with new O-rings provided in appropriate kit(s). NOTE Any   component   exhibiting   a   condition   described   in   steps   (1 through 9) should be replaced. d. Assembly. (1)   Prior to assembly, coat all O-rings, O-ring grooves, and bores with a generous amount of barium base lubricant (Item 51; Appendix E). (2)   Purge valve housing assembly. (a)   Install the O-ring (21) in its groove on the outside diameter of the purge piston.  Place the return spring (36) in the bore of the purge valve housing (31).  Install the Torx head bolt (14) into the I.D. of the purge piston.  Insert the purge piston (19) into the I.D.  of the spring (20).  Using a Torx head wrench engaged on head of Torx head bolt (14), push the piston into the purge valve housing until it bottoms. (b)   While  depressing  the  purge  piston  with  the  12  point  socket,  install  the  following  parts  over  the purge valve bolt (14) from the opposite end of the purge valve housing: the purge valve (18) with its rubber side first, followed by the diaphragm (17) and the diaphragm washer (16) and finally the hex nut (15).  Torque the purge valve nut (15) and bolt (14) to between 60-80 in lbs (7-9 Nm). (c)   Install the three O-rings (10, 11 and 12) on the purge valve housing placing each in its appropriate location.  If the exhaust cover (13) was removed during disassembly, install it on the purge valve housing assembly making certain the "bubble" portion is positioned over the thermostat.  Install the assembled purge valve housing (31) in the end cover (32) making certain to orient both parts such that  the  connector  is  approximately  10  degrees  clockwise  from  the  supply  port,  while  making certain the purge valve housing is fully seated against the end cover (32).  Secure the purge valve housing to the end cover using the three self-tapping screws (9).  Start all three screws by hand, then torque to 85-125 in lbs (10-14 Nm). 5-213

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