Rotax pistons, Rotax piston failure, diagnosing Rotax aircraft engine piston failures.


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Diagnosing Rotax 2 Stroke Aircraft Engine Piston Failure

piston4.gif (69214 bytes)

piston4b.gif (54582 bytes)

4 4A
Piston   damage by foreign material 
( Ref.: 4, 4A & 4B)

4 - piston shows imprints of small cylindrical parts on the dome

Possible Cause

  • needles of broken wrist pin bearing trapped in the squish area between the piston and head, destroy the dome, ring land and rings.
  • make certain to check the condition of the big end rod bearing and cage

4a - Small ball shaped imprints on piston dome

Possible Cause

  • foreign material, e.g. a pop rivet head, has entered the engine and was trapped in the squish area, before leaving through the exhaust port. In some cases the engine continues to run normally until the ring fails

4B - Piston shows a vertical groove on the skirt connected to the wrist pin hole.

Possible cause:

  • A wrist pin circlip has come loose and was trapped in the transfer port window.
  • Note always use NEW circlips when rebuilding an ultralight aircraft engine.

 

piston4b.gif (54582 bytes)
4B

 
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