TM9-2815-226-34-1 - JATONKAM35s HOME ON THE WEB

TM 9-2815-226-34-1(2) Indications located more than 1 in. from major axis on centerline (8) of adjacent web (measuredcircumferentially) must not exceed following limits:(a)(b)(c)Light open indication in or entering fillets (5) are acceptable if 3/16 in. long or less. Light subsurfaceindications are acceptable.Light open indications on crankpin (2) and main journal walls (7) or bearing surfaces that extendcloser than 1/8 in. to fillet (5) but do not enter fillet, are acceptable if 1/4 in. or less. Light subsurfaceindications are acceptable.Nicks on corners (16) of webs (17) are not acceptable. The part will be acceptable if the nick can beremoved by grinding a 1/8 in. radius on the corner.(d) Imperfections on web periphery (21) may be ground out to a depth of 1/8 in. maximum using a 1-1/2in. minimum radius grinding wheel, provided balance limits are maintained.(e)Light open indications that pass within 3/16 in. of a crankpin hole (1) are acceptable if 1/2 in. long orless and does not enter oil hole chamfer or intersect 45° + 10° diagonal. Only those subsurfaceindications that lay closer than 1/16 in. to the surface (measured at the chamfer at 45° + 10° diagonal)are not acceptable. All other subsurface indications are acceptable.(3) Light open indications that enter chamfer of any main bearing oil hole (14) are acceptable if they are 3/8 in.or less. Subsurface indications ending in a main bearing oil hole (14) are acceptable.(4) Fine subsurface salt and pepper type indications are permitted on upper and lower sides of crankpins (2) onthe trimming line.(5) Open longitudinal indications within region (15) which are less than 1-1/8 in. on main journal surfaces (15),and 7/8 in. long on crankpin surfaces (19) are acceptable after the sharp edges have been honed 0.002 -0.004 in. below journal surface.(6) Longitudinal subsurface indications within area (15) or (19) are acceptable.(7) Parallel open indications that met requirements of (4) above, and other requirements on length andfrequency, are acceptable.(8) Parallel subsurface indications are acceptable.3-122