Seizures due to lack of lubrication
Seizures due to lack of lubrication can occur generally, i.e. even if there is sufficient clearance between the cylinder and the piston. In the process the oil film breaks down (often only locally) because of the high temperatures or because of fuel flooding. In these areas, the surfaces of the piston, piston rings and cylinder running surface then rub against each other without any lubrication, which soon causes seizure with a severely worn surface.
A similar situation arises if there is an insufficient lubricating film between the piston and the cylinder due to a lack of oil.
A similar situation arises if there is an insufficient lubricating film between the piston and the cylinder due to a lack of oil.
Characteristic features of a seizure due to lack of lubrication:
If the oil film is destroyed altogether:
Seamless areas of narrow seizure marks, mainly on the piston skirt, showing a severely worn and darkly discoloured surface.
Seamless areas of narrow seizure marks, mainly on the piston skirt, showing a severely worn and darkly discoloured surface.
If there is a lack of oil:
Identical to those described above, apart from the discolouration of the surface. The surface of the seizure areas has an almost pure metallic finish, with no dark discolouration. As the lack of oil affects the entire surface of the cylinder, there are often seizure marks on both the pressure side and the anti-thrust side in the piston, in many cases even in the early stages.
Identical to those described above, apart from the discolouration of the surface. The surface of the seizure areas has an almost pure metallic finish, with no dark discolouration. As the lack of oil affects the entire surface of the cylinder, there are often seizure marks on both the pressure side and the anti-thrust side in the piston, in many cases even in the early stages.
