4. DISASSEMBLY, INSPECTION AND REASSEMBLY OF ENGINES (2) Crankshaft Mainly check seizure and wear of the crankpins and journals. Since the crankshaft gear is shrink-fitted, heat to 180 to 200°C when extrac- tion is necessary. (a) Shaft portion color check After washing the crankshaft, inspect it by means of color check or a magnaflux inspector. Replace it if cracked or heavily damaged. Slight defects shall be corrected by grinding. (b) Crankshaft bend Support the crankshaft journals at both ends with V-blocks. Use a dial gauge and mea- sure the runout at the center journal while rotating the shaft to inspect the bend.
(c) Crankpin and journal measurement Measure the outside diameter, roundness and taper at each crankpin and journal. Correct by grinding if unevenly wear, round- ness exceeding the limit or insufficient out- side diameter is found. Replace if the defect is excessive. To look for the oil clearance of crank pin, measure the inside diameter of crank pin metal according to (5)(d) described later and calculate. 4-40 82E-5 – 98E-5 SERIES Limit 0.02 mm or less Item Limit (Diameter) (mm) Roundness Taper 0.01