132 ENGINE 273 MPFI Connecting-Rod Big End Bearings Inspect the bearing shells for signs of fusion, pitting, bum or flaking and observe the contact pattern. Bearings found in defective condition through this inspection must be replaced. Bearing shells are not meant to be repaired by scrap or grinding with sandpaper or by any machining. The remedy is to replace them. If the limit, indicated above, is exceeded, re-grind the crank- pin to the undersize and use the undersize bearing, both of which are stated below: CAUTION SR. ITEM STD.VALUE UNDERSIZE(0.25) 1. Crankpin diameter 39.98 - 39.995 39.73 - 39.745 2. Bearing clearance 0.015 - 0.058 0.015 - 0.058 Stage Connecting Rod small end BushOutside Parent bore diameter (mm) diameter (mm) Standard 17.006 to 17.017 NA Repair NA NA Max. permissible circularity & ovality of connecting rod small end parent bore NA 0.008 mm Connecting rod small end bush inside dia. (to be finished after installation) NA (Piston pin oiled has thumb push fit in small end bush) Max. permissible out of parallelism (bend) between connecting rod small end & 0.03 mm big end parent bores measured at a distance of 50 mm from centre line of connecting rod big end. Centre to centre distance between connecting rod small end & big end parent 124.25 ±0.03 mm bores. Maximum permissible twist of connecting rod.0.05 mm Stage Connecting rod big end dia. Crank pin journal with bearing shell assembled (mm) diameter (mm) Standard 40.010/40.038 39.980 to 39.995 Repair 1 NA NA Repair 2 NA NA Bearing shells to be selected such that clearance is maintained as 0.015-0.058 mm Max. permissible difference in weight of connecting rods in one engine 5 gms Connecting rod big end axial play 0.05 - 0.35 mm Connecting rod big end parent bore dia. Ø 43+0.016 mm Max. permissible taper & ovality of connecting rod big end parent bore 0.01 mm cylindericity.
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