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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