Crankshaft thrust bearing (thrust ring) severely worn or damaged, seventh spindle tile damaged.
The reason for the damage is that the axial clearance of the crankshaft is too large or too small, which will cause the damage of the crankshaft thrust bearing. In the process of use, large axial clearance impact, small axial clearance temperature rise will produce abnormal wear and tear, resulting in the damage of the seventh main shaft tile. To prevent this kind of problem from happening
When the HOWO engine is installed, the axial clearance of the crankshaft must be in the standard range of 0.18~0.35mm.
The damage reason is: the deformation of the connecting rod exceeds the standard allowable range: the solid moment of the bolt of the bearing bush cover is not uniform; One side back of bearing bush was touched during installation
Injury; Bearing bush installation position is not accurate and up and down is not in alignment.
The reason is: bearing hole deformation taper: crankshaft bending (crankshaft bending is caused by uneven operating clearance, vibration caused by serious wear or damage of relevant parts, balance shock absorber failure. Failure of balance shock absorber can also cause crankshaft fracture); When the bearing bush is installed, the positioning part of the position is not aligned or reversed: the upper and lower tile dislocation oil hole is not smooth.
The reason is that: in order to correct the operation clearance, the two sides of the bearing plane is filed, and the elastic contact force between the bearing and the bearing hole is destroyed; The bearing cover is installed in reverse, which changes the contact area and motion clearance between bearing and shaft; The bolts on the bushing cover are not tightened in accordance with the prescribed method and torque. Too large or too small torque and uneven tightening torque of bolts on the same tile cover will cause bearing bush damage.