TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 (d)   Heat   gear   with   heating   torch   (not   a 8utting  torch)  to  400°F   (205°C).      The gear   will   expand,   making   it   easier   to pull.  Remove gear key. (e)   Inspect crankshaft visually for scratches,   nicks,   cracks,   and   obvious wear pattern. (f)    Measure crankshaft journals with micrometers.  Refer to tabulated data in Chapter 1. (g)   Check crankshaft for out-of-round condition. Crankshafts should be replaced   if   main   bearing   or   crankpin journals    are    worn    out-of-round    more than 0.001 inch (0.05 mm). (h)   Measure and carefully examine crankshaft  thrust  flange  at  No.  7  main bearing;    refer    to    tabulated    data    in Chapter  1.    If  surfaces  are  scored  or scratched, crankshaft should be replaced. (4)   Camshaft Bushings. (a)   Use   inside   micrometers   or   dial   bore gauge   to   measure   camshaft   bushing inside   diameter.      Mark   bushings   for replacement   if   worn   larger   than   worn limit specified in Chapter 1. (b)   Check for chipped, scored, or scratched surfaces. (c)   If   bushings   show   signs   of   turning,   in block    bore,    check    block    bore    sizes. Refer to tabulated data in Chapter 1. (5)   Cylinder Block. (a)   Use  dye  penetrant  method  for  locating cracks,  porosity,  leaks  and  other  faults. Clean   suspected   defective   area   with kerosene or other grease-removing cleaner. (b)   Apply dye penetrant allowing time for it to dissolve or enter in the defect.  Allow approximately 15 minutes for dye to act. Do not "force" dry.  Remove all excess penetrant and apply developer so defect will  stand  out.    Cracks  usually  show  up as   a   solid   or   dotted   line.      Porosity usually shows up as dots in local area. (c)   Check for signs of corrosion.  Corrosion most   frequently   occurs   on   portions   of block    nearest    cylinder    liners    and    is evidenced by pitting. c.    Repair.  To repair the cylinder block, proceed as specified in the following paragraphs: (1)   Tappet Bores. (a)   Measure tappet bores with a small bore gauge. (b)   If worn beyond limit specified in Chapter 1 or out-of-round more than 0.0015 inch (0.038 mm), replace cylinder block. (2)   Idler Gear Shaft. (a)   Replace idler gear shaft if worn smaller than 1.9965 inch (50.711 mm). (b)   Remove  outer  screw  (16,  figure  13-50) from  left  side  of  idler  shaft  boss;  then remove  screw  (15)  which  secures  shaft in cylinder block. (c)   Using  a  suitable  puller,  pull  idler  shaft (14) from block. (d)   Place new idler shaft in block bore and drive 13-97