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Page Title: REPLACE/REPAIR CRANKCASE ASSEMBLY (Continued)
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TM 5-4320-306-24 4-13. REPLACE/REPAIR CRANKCASE ASSEMBLY (Continued) CLEANING/INSPECTION WARNING Death  or  serious  injury  could  occur  if  diesel  fuel  oil  is  not  handled  carefully.    Use  in  a  well- ventilated  area  away  from  open  flame,  arcing  equipment,  ignition  sources,  heaters,  or  excessive heat.  Always store fuel in proper, marked containers.  DO NOT SMOKE. Death  or  serious  injury  could  occur  if  compressed  air  is  directed  against  the  skin.    Do  not  use compressed  air  for  cleaning  or  drying  unless  the  pressure  is/has  been  reduced  to  30  psi  (2.11 kgcm2) or less.  When working with compressed air always use chip guards, eye protection, and other personal protective equipment. Live steam used for cleaning shall not exceed 100 psi (690 kPa).  Use goggles or face shield for eye protection.  Do not direct live steam against skin. 1 Clean crankcase thoroughly with live steam. Clean all exterior and interior openings and surfaces. Be especially careful to clean all oil passages to make sure they are open.  Use a small and/or large wire bristle brush where necessary to remove carbon or other deposits from openings and surfaces.  Use diesel fuel oil as necessary to soften and remove carbon or hardened oil deposits. Dry with compressed air. 2 Thoroughly inspect crankcase for any cracks, discoloration, distortion, rust, corrosion, or other damage. Use MIL- 1-6868  magnetic  particle  inspection  to  detect  cracks.  If  crankcase  is  cracked,  distorted,  overheated,  seriously rusted or corroded on machined surfaces, or exhibits other serious damage, replace crankcase. 3 Make  sure  camshaft  bushing  (1)  is  seated  properly  in  crankcase.    Inspect  for  damage  or  excessive  wear. Measure bushing bore with micrometer at points 1 and 2 and along axes A and B.  Bore measurement should be 1 889 to 1.8911 inches (47.98 to 48 034 mm).  If measurement is outside these tolerance limits, replace bushing. 4-106

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