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Seizure due to insufficient clearance on the piston skirt

DESCRIPTION OF THE DAMAGE

Seizure due to insufficient clearance on the piston skirt | Kolbenschmidt | Motorservice
Seizure due to insufficient clearance on the piston skirt
  • Several similar areas of seizure marks around the
  • piston skirt.
  • Seizure marks on both the pressure and anti-thrust sides of the piston skirt, i.e. seizure marks on opposite sides.
  • Surface changes from bright wear marks to smooth, darkly discoloured areas of wear caused by rubbing.
  • Undamaged ring zone.

DAMAGE ASSESSMENT

The clearance between the piston skirt and the cylinder running surface was either too narrow by design, or it wasrestricted by distortion that possibly did not occur until the engine was operating.
Note - Attention | Motorservice NOTE
In contrast to a seizure due to lack of lubrication, a seizure due to insufficient clearance always occurs after a brief running-in period following engine reconditioning.

POSSIBLE CAUSES FOR THE DAMAGE

  • Cylinder bore too small.
  • Cylinder head over-tightened or tightened unevenly (cylinder distortion).
  • Uneven mating surfaces on the cylinder block or cylinder head.
  • Dirty or damaged threaded bores or cylinder head bolts.
  • Seized or insufficiently lubricated seating surfaces.
  • Use of incorrect or unsuitable cylinder head gaskets.
  • Cylinder distortion caused by uneven heating due to lime deposits, dirt or other malfunctions in the cooling system.
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