During scavenge space inspection, following items especially related to piston rings must be inspected:
- Check condition of sludge for any metal particle
- Check whether flap valves through which air enters scavenge space is free or not
- Check Piston Rings ( for good piston ring Condition)
When good and steady service conditions have been achieved, the running surfaces of the piston rings and cylinder liner will be worn bright (this also applying to the ring undersides and the “floor” of the ring grooves, which, however, cannot be seen). In addition, the rings will move freely in the grooves and also be well oiled, intact, and not unduly worn.
The ring edges will be sharp when the original roundings have been worn away, but should be without burrs.