1. individual bearing unilateral severe wear and tear, the Invar surface rubs.

The reason is: the amount of deformation of the rod more than the standard allowable range; bearing cover bolts sturdy torque uneven; when installing the back of the bearing unilateral bumps; bearing installation location is not accurate and up and down the misalignment.

2, seven bearing unilateral wear serious, intermediate bearing at both ends of bearing wear is more severe.

The reason: bearing hole deformation taper; crankshaft bending (caused by crankshaft bending of the reason is: the uneven operation of the gap, the relevant parts badly worn or damaged vibration, and balance shock absorber failure. Balance damping failure can also be caused by the fractured crankshaft); positioning part of the location of the installation of the bearing is not positive or anti-fitted: the dislocation of the upper and lower tile hole is not smooth.

3, bearing back of corrosion or trace mobile grinding marks; bearing positioning damage to the bearing rules go cylindrical.

Bush cover on the contrary, to change the bearing and shaft contact area and the movement gap: the installation in order to correct running clearance, cutting and filing bearing on both sides of the side plane, and destruction of the elastic contact force of the bearing and the shaft hole;; bearing cover tightening the bolt

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