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Cylinder liner crack due to hydraulic lock

DESCRIPTION OF THE DAMAGE

  • Upper area of cylinder liner displays severe damage due to a crack and seizure marks on the sliding surface (Fig. 2 and 3).
  • Piston displays seizure marks on the pressure and anti-thrust sides.
  • In the piston crown: bowl-shaped recess in the area of the seizure marks (Fig. 4).
Wear damage - Cylinder liner crack due to fluid shock| Kolbenschmidt | Motorservice
Fig. 1
Cylinder and cylinder liner - wear damage: Upper area of the cylinder liner with severe crack damage and scuffing marks on the running surface| Kolbenschmidt | Motorservice
Fig. 2
Cylinder and cylinder liner - Wear damage: in the piston crown trough-shaped recess in the area of the scuffs| Kolbenschmidt | Motorservice
Fig. 4
Cylinder and cylinder liner - wear damage: Upper area of the cylinder liner with severe crack damage and scuffing marks on the running surface| Kolbenschmidt | Motorservice
Fig. 3

DAMAGE ASSESSMENT

The cylinder liner was damaged by a hydraulic lock, which burst the cylinder liner and pressed in a dent in the piston crown.

The piston material has been squashed outwards, causing a significant restriction of the piston clearance in the cylinder bore. It is not possible to identify whether the hydraulic lock occurred while the engine was running or while it was being started.

POSSIBLE CAUSES FOR THE DAMAGE

  • Accidental intake of water while driving through water, or as a result of larger quantities of water being splashed up by passing vehicles or vehicles in front.
  • While the engine is stopped, cylinder filling up with:
    • coolant due to leaks in the cylinder head gasket or cracks in components.
    • fuel due to leaking injection nozzles. The residual pressure in the fuel injection system is dissipated through the leaking nozzle into the cylinder. The damage occurs when the engine is started.
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