bpr Rotax 912 i Series, Руководство по обслуживанию, Страница: 195 / 458

Effectivity: 912 i Series
Edition 1/Rev. 0
d
053
45.
fm
MAINTENANCE MANUAL
BRP-Powertrain
72-30-00
Page 13
July 01/2012
Fig. 18
VALVE GUIDE CHECK
See Fig. 19
Fig. 19
VALVE CHECK
NOTE:
The valve stem diameter VTO is mea-
sured in the edge region of the run-
ning surface of the valve stem.
Fig. 20
m
WARNUNG
NOTICE
If the wear limit has been reached, the valve gui-
de must be replaced.
Step Procedure
1 Check the valve guide visually for dam-
age and wear.
2 Inspect the inner diameter of the valve
guide.
06448
dim.
m
WARNUNG
NOTICE
Replace the valve if the valve stem is out of spe-
cification, is damaged or shows traces of wear.
Step Procedure
1 Check the valve visually for damage and
wear.
2 Determine the valve stem diameter and
check the valve disc for wear.
3 Check the valve end face for pitting.
4 Check the valve stem for any deposits.
1. Valve stem 2. Valve end face
3. Retaining grooves 4. Max. oil residues
m
WARNUNG
NOTICE
Oil residues up to max. 20 % of the running sur-
face are permissible.
At greater values, the valve may have already
been overheated and must be replaced. Risk of
valve fracture at the weld point.
06449
4
1
2
3