Two stroke Rotax engine piston failure caused by poor quality of oil.

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Diagnosing Rotax 2 stroke aircraft engine piston failure, caused by poor quality or inferior oil.

Piston ring scuffing

Piston  fracture

6 7

Piston ring scuffing ( Ref.: 6)

Cylinder liner shows scoring areas, which are exactly limited to the ring travel zone. Beside the blue colored vertical stripes, the surface is in good condition. The rings show corresponding dark colored marks. The reason is a breakdown of the lubrication.

Possible Cause

  • improper break in period
  • poor oil quality
  • not enough oil in premixed fuel
  • low delivery rate from oil injection system

Piston  fracture ( Ref.: 7)

Material fatigue fracture can sometimes e observed on pistons of high speed engines, however, skirt fracture is usually the result of excessive piston to cylinder wall clearance.

Other possible causes:

  • connecting rod breakage

  • damage due to bad handling,

  • crankshaft locking via piston blocking

  • engine has ingested foreign material

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