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OPERATION AND MAINTENANCE MANUAL FOR FOTON VIEW SERIES LIGHT BUS
·136· direction, i.e., the big end is eccentric to connecting rod body. Connecting rod can fit the crankshaft properly only under following conditions: arrowhead mark on the top surface of piston points front; the marks (protuberated) on connecting rods for cylinders No.1 and 3 face forward; and that for cylinders No. 2 and 4 face rearward. So, when to reassemble the piston connecting rods, these for cylinders No. 1, 3 and for No. 2, 4 should be sorted and reassembled respectively. The weight difference among groups should not be more than 5 g.
Figure 8-8 Upper/Lower Main Bearing Shell of Crankshaft 1-Upper main bearing shell; 2-Oil hole; 3-Locating protruded lip; 4-Lower main bearing shell
Before the piston connecting rod is installed into the cylinder liner, apply the clean oil on the outer surface of piston, connecting rod small end and bearing shell surface. The openings of the first and second piston rings should mutually stagger 180°, and avoid pointing to the direction of piston pin. The oil ring and the second ring should stagger 90° (see Figure 8-5). When the piston connecting rod is installed into the block, the piston head guide groove should face the tappet side (injection pump side). After tightening the connecting rod bolt to the specified torque (55 – 65 N·m) during assembly, check if the crankshaft rotates smoothly and if there is an axial clearance in the connecting rod big end. ● Note: Replace the body and cap of the connecting rod in pair at the same time. 8.2.8 Assembly of Upper/Lower Bearing Shell of Crankshaft The crankshaft journal of turbocharged diesel engine is supported on the block by the main bearing cap. The upper bearing shell of crankshaft has the oil groove and hole (see Figure 8-8), and the upper and lower bearing shells are not interchangeable. When to press to mount the timing gear, the mark “X” on gear should face outward (see Figure 8-9). |