The cause of the crankshaft bending and twisting (Dieselpartsworld) 2016-02-28    

The cause of the crankshaft bending and twisting
(1) the main bearing gap is too large, the engine in the deflagration shock or overload conditions, the excessive vibration of crankshaft.
(2) a cylinder not working or imbalance.
(3) the main bearing cover tightness is not consistent, so that the crankshaft uneven force.
(4) the cylinder body main bearing hole concentricity deviation.
(5) the improper operation, when towing trailers start too fast.
(6) the store is not reasonable, long time no horizontal support.
Crankshaft damage inspection
1, wear outside micrometer.
Test 2, crack
(1) oil leakage percussion method: cleaning clean crankshaft soaked in kerosene, the crankshaft out clean, sprinkled on the surface of the pigment and hammer along the axial direction tap crankshaft non working face, white if obvious crack like traces of oil, there are cracks.
(2) magnetic crack detection by the detector will be magnetized parts. In part may crack sprinkle some powder, when the magnetic flux through the cracks at the edge, the powder will be adsorbed at the crack, so as to show the location and size of the crack.