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1.3 Measurement of main journal clearance: place a plastic feeler gauge on the crankshaft main journal, tighten the main bearing shell cover to specified torque and then loosen it, use the thickness check list on the plastic feeler gauge to read the value. The normal value should be: 0.02-0.06mm. Use the same method to measure connecting rod journal clearance.
1.4 Measurement of crankshaft axial clearance: tighten the main bearing shell cover to specified torque and then use a dial gauge to measure the crankshaft axial clearance. When measuring, push the crankshaft off the dial gauge first and keep the dial gauge has certain amount of compression, set the pointer to zero, and then push the crankshaft to the adverse direction and the numerical value fetched from the dial gauge will be the crankshaft axial clearance. The normal value should be 0.02-0.30mm. If exceeding this scope, replace the crankshaft thrust sheet or the crankshaft.
2. Detection of piston 2.1 Detection of piston diameter: use an outside micrometer to measure the piston diameter. When measuring, remember to measure at the place about 11mm up from lower end of the piston. The normal value should be φ72.965±0.009.
2.2 The piston pin is of semi-floating type, which can not be disassembled during maintenance, because it can not be assembled using common machining technique after disassembled. If abnormal noise occurs due to improper piston pin clearance, replace the piston assembly.
2.3 Measurement of piston ring. 2.3.1 Measurement of piston ring end play: first, place the piston ring into cylinder.
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