Rotax 912 i Series Maintenance Manual page 193

Fig. 23
1. Valve spring
WASHER CHECK
Step
1 Check the washers visually for damage
and wear.
The wear must be measured starting from the
reference face (on the inner part of the valve
spring support) radially outwards in the measu-
rement region, using a dial gauge. Dimension t
= max. 0.04 mm.
Break-in (wear) of more than 0.04 mm is not per-
missible. If this value is exceeded, the valve, the
valve spring support, the valve spring retainer,
the valve cotter and the hydraulic valve tappet or
other damaged components in the affected valve
drive must always be replaced.
Fig. 24
1. Measurement region
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Procedure
1
06453
The valve spring support can be used
NOTE:
as an indicator of a malfunction of the
valve drive relating to poorly or insuf-
ficiently ventilated hydraulic valve tap-
pets. In normal conditions, no measu-
rable wear can be seen even after a
relatively long operating time.
See also SI-912-018, "Ventilation of
the lubrication system".
Fig. 25
"Magnified image"
ROCKER ARM CHECK AND ROCKER
ARM SHAFT CHECK
System description
The rocker arm bearing is lubricated by the hol-
low drilled push-rod of the ball joint socket. The
rocker arm bearing is supplied with oil via the oil
ducts in the rocker arm. The oil exits and thus
lubricates the rest of the valve mechanism via
the bore. The rocker arms for the inlet and outlet
are different.
Illustration shows wear
on the washers
"Magnified image"
72-30-00
Page 15
July 01/2012