Piston Seizure On Major & Minor Thrust Side
The skirt area of the Piston exhibits heavy frictional wear with seizure marks on both major and minor thrust sides. It may be concluded that piston clearance was too small. This damage occurs after short operation (new condition), since thermal expansion is impeded by the insufficient clearance.
DAMAGE CAUSED BY JAMMED RINGS
Rings have jammed because of oblique running of the piston losing their sealing effect. Hot combustion gases can blow pass the rings, destroying the oil film. This defect can also be caused by an oil carbon, dirt, metal chips in the case of incorrect assembly.