TM 9-2815-225-34&P 3-37.  CRANKSHAFT REPAIR (Contd) LOCATION/ITEM ACTION REMARKS b.  Inspection (Contd) 11.     Critical region (6), Limits listed in the following Dimensional value of C is crankpin centerline (8), steps must be maintained within vertical distance measured crankpin wall (1) and (3) region C.  Refer to Table 2. downward from crankpin center- line (8) extending longitudinally for all webs (17) between crankpin walls (1) and (3). 12.     Centerline (8), fillets (4), Indications located less than crankpin (2), main journal 1 in. (25 mm) from the major walls (22) axis of centerline (8) of adjacent web (17) (measured circumfer- entially) must not exceed the following limits: a.  Light indications in or entering fillets (4) are acceptable if not more than 0.125 in. (3.175 mm) long (open) or 0.250 in. (6.35 mm) long (subsurface). b.  Light open indications on Light subsurface indications are crankpin (2) and main journal acceptable. walls (22) or bearing surface that extend closer than 0.125 in. (3.175 mm) to fillets (11), but do not enter fillets, are acceptable if 0.1875 in. (4.763 mm) long or less. 13. Centerline (8), crankpin Indications located more than (2), main journal walls (22), 1.00 in. (25.4 mm) from major axis or fillets (4), corners of centerline (8) of adjacent web (17) counterweight welds (16), (measure circumferentially) must webs (17), web periphery (21) not exceed following limits: a.  Light open indication or Light subsurface indications are entering fillets (4) are acceptable acceptable. if 0.1875 in. (4.763 mm) long or less. b.  Light open indications on Light subsurface indications are crankpin (2) and main journal acceptable. walls (22) or bearing surfaces that extend closer than 0.125 in. (3.175 mm) to fillet (11), but do not enter fillet, are acceptable if 0.250 in. (6.35 mm) or less. c.  Nicks or sharp corners in Crankshaft will be acceptable if counterweight welds (16) of webs nicks can be removed by grinding (17) are not acceptable. a 0.125 in. (3.175 mm) radius on corner. d.  Imperfections on web periphery (21) may be ground out to a depth of 0.125 in. (3.175 mm) maximum using a 1.50 in. (38.1 mm) minimum radius grinding wheel, provided balance limits are maintained. e.  Light open indications that All other subsurface 3-160