Longitudinal cylinder liner cracks
DESCRIPTION OF THE DAMAGE
- Vertical crack, extending from the liner flange.
- Dry cylinder liners can also be affected because of their relatively thin cylinder wall thickness.
DAMAGE ASSESSMENT
Cracks of this nature are frequently caused by careless handling of the cylinder liners (as a result of impacts or blows). Even if the cylinder liner does not suffer visible damage straight away, a microscopic crack or notch can generate a fracture during subsequent operation of the engine. Incorrect liner flange seat surfaces and dirt between the cylinder liner and the cylinder block can also cause this type of damage. In the case of longitudinal cracks caused by faulty liner flange seating surfaces, the longitudinal cracks often occur in conjunction with lateral cracks.
POSSIBLE CAUSES FOR THE DAMAGE
- Cracks or notches due to improper handling of the cylinder liners during transport or repairs.
- Hydraulic locks.
- Foreign bodies underneath contact or sealing surfaces.
- Faulty flange seat (refer to the chapter entitled “Torn-off flange on the cylinder liner”).
- Material erosion on edge of the cylinder liner through knocking combustion and consequent weakening of the cylinder liner.