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TM9-2815-202-34 4-35.   CRANKSHAFT   MAINTENANCE   (Cont) c.  Cleaning l l WARNING Dry  cleaning  solvent  P-D-680  is  toxic  and  flammable.  Wear  protective goggles  and  gloves  and  use  only  In  a  well-ventilated  area.  Avoid contact with skin, eyes, and clothes and don’t breathe vapors. Do not use  near  open  flame  or  excessive  heat.  The  flash  point  is  100oF-138oF (38°-50oC).  If  you  become  dizzy  while  using  cleaning  solvent,  get  fresh air  immediately  and  get  medical  aid.  If  contact  with  eyes  is  made,  wash your  eyes  with  water  and  get  medical  aid  immediately. Compressed  air  used  for  cleaning  purposes  will  not  exceed  30  psi.  Use only  with  effective  chip  guarding-and  personal  protective  equipment (goggles/shieid,   gloves,   etc). (1) Clean all crankshaft oil passages thoroughly with cleaning solvent and dry with compressed air. (2) Clean front and rear crankshaft gears with cleaning solvent. d.  Inspection (1) inspect gear teeth for evidence of scoring, pitting, and wear. If severely damaged or  worn, replace  gear. (2)  Inspect  crankshaft  keyways  for  evidence  of  cracks  or  wear.  Replace  crankshaft  if  required. CAUTION l l (3) Replace  crankshaft  if  it  shows  evidence  of  excessive  overheating  since  heat treatment  has  probably  been  destroyed. Ridges on crankshaft journals must be removed. If ridges are not removed, localized high  unit  pressures  are  placed  on  new  bearing  shells  and  short  bearing  life  can result. Inspect  crankshaft journals  for  ridges  and  grooves.  Ridges  exceeding  0.0002  inch  must  be removed. NOTE Replace crankshaft if journal ridges are greater than 0.001 inch in depth. (4)  Remove  crankshaft   journal  ridges  by  working  crocus  cloth,  wet  with  fuel  oil,  around circumference of journals. if ridges are greater than 0.0005 inch, first use 120 grit emery cloth to clean up ridges, 240 grit emery cloth for finishing and wet crocus cloth for polishing. 4-154


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