55 4 DLT ENGINE Oil parent bore in connecting rod. Install new bush in such a way that slit is positioned at approximately 450 from vertical axis. Drill oil hole in new bush. Finish connecting rod small end bush bore on a connect ing rod boring machine. Al ternately connecting rod small end bush may be reamed. Install connecting rod bearing caps without bearing shells on connecting rod. Tighten connecting rod bearing cap mounting nuts to specified torque. Refer Figure 95. ENSURE THAT IDENTIFICATION NUMBERS FOR CONNECTING ROD AND CONNECTING ROD BEARING CAP ARE MATCHED AND NOTCHES FOR BEARING SHELLS ARE ON SAME SIDE. Check twist and bend of connecting rod by using new piston pin in connecting rod small end bush. Refer Figures 96 & 97 Measure twist and bend of connecting rod with feeler gauge with respect to vertical face of connecting rod alignment gauge in vertical and horizontal plane at a distance of 50 mm from line joining centers of connecting rod small end and big end bosses. If necessary, straighten connecting rod in cold condition. Since a slight clearance exists between connecting rod bolts and corresponding connecting rod bearing cap holes, it is possible that connecting rod bearing cap once removed may be installed off center, by which dimension of connecting rod big end parent bore will be different in different direction. If there is a difference noticed in connecting rod big end parent bore dimension, connecting rod bearing cap can be centralized by lightly tapping it with mallet in required direct ion after sl ight ly loosening connecting rod bearing cap mounting nuts. Fig. 95 Fig. 96 Fig. 97
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