Rotax 912 i Series Maintenance Manual page 154

FLAKE PITTING (LARGE-AREA FLANK
FRACTURES)
See Fig. 22 and Fig. 23.
Features:
A large-area, triangular flank fracture emanating
from a micropitting zone or a fine line of pits in
the tooth dedendum. The fracture area has a
relatively constant depth. Further cracks can run
obliquely over the flank from the fracture. The
damage sometimes extends into the addendum
region, which results in breakage of the tooth tip.
NOTICE
WARNUNG
If flake pitting is found, the gear set must be re-
placed.
Max. permissible pitting or flake pitting. See
Destructive pitting.
NOTICE
WARNUNG
The whole gear set must always be replaced.
Gears must not be replaced individually.
Causes:
This pattern of damage generally occurs at low
operating oil viscosities and/or high oil tempera-
tures. Apart from these, the same causes apply
as for pitting.
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Fig. 22
Triangular flake pitting
Magnification approx. 2x.
Fig. 23
Triangular flake pitting
Magnification approx. 2x.
72-10-00
Page 16
July 01/2012