37 4 DLT ENGINE Maximum permissible 0.005 mm taper of crank pin Maximum permissible ovality 0.050 mm of crank pin Maximum permissible run out 0.1 mm of 2nd, 3rd and 4th main bearing journals when supported at 1st and 5th main bearing journals Maximum permissible out 0.010 mm of parallelism between crank pin and main bearing journal axis Pretension of main 0.067/0.134 mm bearing shells Hardness of crank shaft main bearing and crank pin journals 53 to 59 HRC Main bearing parent bore dia 63.720/63.739 mm Maximum permissible 0.010 mm taper of main bearing parent bore Maximum permissible ovality 0.030 mm of main bearing parent bore Main bearing clearance 0.04 to 0.08 mm CAMSHAFT Camshaft journal & bearing bore dimensions: Stage Camshaft bearing Camshaft bearing journal bore journal diameter diameter in cylinder head mm mm Standard 28.000/28.021 27. 937/27.950 Standard1 27.900/27.921 27.837/27.850 Bore dia in 1st 50.000/50.025 & 5th cap for front & rear oil seals Maximum permissible 0.025 mm run out of cam shaft bearing journal Maximum permissible 0.080 - 0.150 mm axial play of cam shaft in installed condition Camshaft bearing 0.03 to 0.064 mm clearance Hardness of cam lobes 57 - 62 HRC CONNECTING ROD (Dimensions) Connecting rod small end Stage parent bore bush outside diameter diameter mm mm Standard 31.00/31.025 31.038/31.114 Standard1 31.200/31.225 31.238/31.314 Maximum permissible taper 0.010 mm and ovality of connecting rod small end parent bore Connecting rod small end 28.020/28.033 mm bush inside diameter (to be finished after installation) (Piston pin oiled has thumb push fit in small end bush) Maximum permissible 0.050 mm out of parallelism (bend) between connecting rod small end and big end parent bores Center to center distance 145.000/145.040 mm between connecting rod small end and big end parent bores Maximum permissible 0.050 mm twist of connecting rod measured at a distance of 50 mm from centre line of con-rod Connecting rod big 53.690/53.709 mm end parent bore diameter Maximum permissible taper 0.010 mm and ovality of connecting rod big end parent bore
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