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Incorrectly installed oil control ring

DESCRIPTION OF THE DAMAGE

  • No signs of wear on piston rings or piston (Fig. 1).
  • End of the expander spring of the 3-piece oil control ring broken off.
  • Scratches in the groove base of the oil control ring.
Incorrectly installed oil control ring | Kolbenschmidt | Motorservice
Fig. 1

DAMAGE ASSESSMENT

Due to the overlapping of the expander spring during installation, its circumferential length is shortened. This results in a fracture in the expander spring and/or loss of tension for the 3-piece oil control rings. The blades are no longer pressed tightly against the cylinder wall and no longer scrape off the oil. Oil enters the combustion chamber, where it is burned. This results in excessive oil consumption.

POSSIBLE CAUSES FOR THE DAMAGE

  • Incorrect oil control rings.
  • Installation faults.
Incorrectly installed oil control ring | Kolbenschmidt | Motorservice
Fig. 2a
Note - Attention | Motorservice CAUTION
Both coloured parts of the expander spring must be visible after installation of the 3-piece oil control rings. These colour-coded marks should therefore always be checked (even on pre-installed piston rings) before installation of the pistons (Fig. 2).
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