bpr Rotax 912 i Series, Руководство по обслуживанию, Страница: 154 / 458

Effectivity: 912 i Series
Edition 1/Rev. 3
d0
667
2.
fm
MAINTENANCE MANUAL
BRP-Rotax
72-10-00
Page 18
July 01/2018
FLAKE PITTING (LARGE-AREA FLANK
FRACTURES)
See Fig. 29 and Fig. 30.
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 rel-
atively 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.
Max. permissible pitting or flake pitting. See
Destructive pitting.
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.
Fig. 29
Fig. 30
m
WARNUNG
NOTICE
If flake pitting is found, the gear set must be re-
placed.
m
WARNUNG
NOTICE
The whole gear set must always be replaced.
Gears must not be replaced individually.
Triangular flake pitting
Magnification approx. 2x.
Triangular flake pitting
Magnification approx. 2x.