Maintenance requirements of crankshaft


 (1) Disassemble and clean the crankshaft components to ensure that the internal oil passage of the crankshaft is clean and smooth.

(2) Carry out flaw detection on the crankshaft. If there is any crack, it must be replaced. Carefully check the crankshaft journal, connecting rod journal and their transition arcs, and all surfaces shall be free of scratches, burns and bumps.

(3) Check the crankshaft main journal and connecting rod journal, and repair them according to the repair level after the size exceeds the limit. Repair of crankshaft journal is as follows:

(4) Check the hardness requirements of crankshaft journal and connecting rod journal, which must meet the technical requirements. Otherwise, it should be reprocessed to meet the use requirements.

(5) The radial circular runout of the crankshaft and the radial runout of the thrust face to the common axis of the main journal must meet the technical requirements. Otherwise, it must be corrected.

(6) The parallelism of the connecting rod journal axis to the common axis of the main journal in the whole length must meet the technical requirements.

(7) When the front and rear transmission gears of the crankshaft are cracked, damaged and seriously worn, the crankshaft should be replaced. (8) Crankshaft balance weight bolts must be replaced if there is any crack. After replacing the balance weight or the balance weight bolt, the crankshaft assembly should be tested for dynamic balance to ensure that the unbalance meets the technical requirements.

(9) Replace the flywheel and pulley bolts if there are cracks, scratches or the elongation exceeds the limit.

(10) Carefully check the shock absorber of the crankcase leg, and replace it if it is damaged, rubber is aging, cracked, deformed or cracked.

(11) When assembling crankshaft, pay attention to the installation of main bearing and thrust bearing. Check the axial clearance of the crankshaft and tighten the vertical and horizontal bolts of the main bearing cover as required. (First vertical, then horizontal)

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