ENGINE 32 CONNECTING ROD : Standard and Repair sizes of connecting rod big end bearing. Bearing bore in Wall thickness of bearing installed condition. shells ready for installation. mm. mm. Standard 60.085/60.065 2.462/2.472 Standard – I 59.985/59.965 2.512/2.522 Repair size – I 59.835/59.815 2.587/2.597 Repair size – II 59.585/59.565 2.712/2.722 Repair size – III 59.335/59.315 2.83712.847 Repair size – IV 59.085/59.065 2.96212.972 Connecting rod big end bearing parent bore 65.016/65.00 mm Maximum permissible taper and ovality in big end bearing parent bore 0.005 mm Pretension of connecting rod bearing shells 0.08-0.14 mm Diametral clearance between crank pins and connecting rod big end 0.050-0.095 mm bearings End play of connecting rod 0.100-0.400 mm Maximum permissible out of parallelism (bend) between small end and 0.025 mm big end bores (at 50 mm from centre axis) Maximum permissible twist of connecting rod (at 50 mm from centre axis) 0.10 mm Measure the twist and bend of connecting rod with a feeler gauge with respect to vertical face of the connecting rod alignment gauge in vertical and horizontal planes and at a distance of 50 mm from the line joining centres of small and big end bosses. If necessary straighten the connecting rod in cold condition. Standard and Repair sizes of connecting rod small end parent bore and bush: Parent bore Bush outside diameter mm mm Standard 39.025/39.000 39.075/39.045 Repair size – I 39.225/39.200 39.275/39.245 Repair size – II 39.525/39.500 39.575/39.545 Maximum permissible taper and ovality in small end parent bore. 0.01 mm Maximum permissible taper and ovality in small end bush bore. 0.005 mm Connecting rod bush inside dia 36.04/36.03 mm (finished size after installation) Piston pin outside dia 36.000/35.995 mm Radial clearance between piston pin and bush 0.03-0.045 mm Connecting rod big end centre to small end centre distance. 182.05/182.00 mm Permissible difference in weight of connecting rods in the engine 10 gm
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