134 ENGINE 273 MPFI • Check cylinder block for cracks by pressure testing method. • Clean cylinder bores, bearing surfaces, oil passages in crank case thoroughly. Check water jackets for leakages by blowing air at a pressure of 5 bar & then dipping the cylinder block in the hot water (temp of water 70 °C to 80 °C). • The block with any leakages / cracks should be discarded. • Thoroughly clean main bearing caps and corresponding machined surfaces of crank case. Install main bearing caps without bearing shells in their respective positions on crank case. • Tighten main bearing cap mounting bolts to specified torque. • Check crank case main bearing parent bore dimensions. • Install new pairs of main bearing shells according to size of crank shaft main bearing journal diameter, making sure that securing lugs of bearing shells are properly seated in grooves of crank case and main bearing caps. • Install main bearing caps with bearing shells in their respective position on crank case. • Tighten main bearing cap mounting bolts in specified sequence to specified torque. • Measure main bearing bore. If main bearing parent bore dimension is maintained within specified limits, proper main bearing bore dimension is automatically achieved. However, it must be physically measured and confirmed. Main bearing shells are precision finished and should not be bored or scrapped.
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