6) Rocker Arm; 7) Cylinder Head Hardness Test - Rotax 912 Series Maintenance Manual

14.5.6)
14.5.7)
04315
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL II
Rocker arm
See fig. 169 and 170.
The rocker arm bearing surface Q is lubricated via the hollow push rod W
towards the ball cup E. The oil flows through the bores R in the rocker
arm. The oil exit and in consequence the splash oil lubrication of the
complete valve mechanism is via bore T. The rocker arms for inlet and
outlet are different.
Check rocker arm shaft and rocker arm bearing Y for traces of seizure.
Visually inspect valve stem contact area U and ball cup E of rocker arm.
Excessive signs of wear indicate lack of oil. Slightly rework of valve stem
contact area U on rocker arm is allowed. Check oil bores R in rocker arm
for free passage.
Dimensions
See Wear Limits in para 15.
00286
1 5
3 6
fig. 169
Cylinder head hardness test
See fig. 211.
6
fig. 211
5
New
00287
6
Maß
dim.
7
S
fig. 170
If the engine has exceeded the maximum
cylinder head temperature (e.g. the cylin-
der head temperature has exceeded 180°
C or (356 F) for more than 30 minutes).
Verification of cylinder head hardness is
mandatory and must be carried out.
Check hardness in the area T of the bear-
ing support.
For minimum hardness, see Wear Limits in
para 15.
Do not damage sealing surface for O-ring
6,4 x 1,8 Y.
Wear limits
4
2
page 107
Initial issue, Jan. 01/2002