ENGINE 71 CONNECTING ROD Stage Connecting Rod small end Parent bore diameter (mm) Bush Outside diameter (mm) Standard 34H7 34.3 +/- 0.02 Standard 1 34.2H7 34.1 +/- 0.02 Max. permissible circularity and ovality of connecting rod small end parent bore 0.005 mm 0.008 mm Connecting rod small end bush inside dia. (to be finished after installation) (Piston pin oiled has thumb push fit in small end bush) Ø 31.020 - Ø 31.033 mm Max. Permissible out of parallelism (bend) between connecting rod small end and big end parent bores measured at a distance of 100 mm from centre line of connecting rod big end. 0.06 mm Centre to centre distance between connecting rod small end and big end parent bores. 149 + 0.03 mm Maximum permissible twist of connecting rod 0.1 mm Connecting rod big end parent bore dia. Ø 53.69+0.019 Max. permissible taper and ovality of connecting rod big end parent bore cylindericity 0.008 mm 0.01 mm Stage Connecting Rod small end and big end parent bore dia. Crank pin journal dia. With bearing shell (mm) Normal 50.008, 50.047 50 -0.005,-0.02 Normal 1 49.958, 49.997 49.90 -0.005, 0.02 Repair 1 49.758, 49.797 49.75 -0.005,-0.02 Repair 2 49.508, 49.547 49.5 -0.005,-0.02 Bearing shells to be selected such that clearance is maintained as 0.011-0.065 mm Pre tension of connecting rod big end bearing shells 0.060-0.090 mm Max. permissible difference in weight of connecting rods in one engine ± 3 gms Connecting rod big end axial play 0.1 - 0.35 mm
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