3) Fitting Of Cylinder; 4) Fitting Of Cylinder Head - Rotax 912 Series Maintenance Manual

14.9.3)
Ringstoß
ring gap
1
2
3
fig. 192
00309
14.9.4)
7
6
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL II
Fitting of cylinder
See fig. 191.
Place O-ring 87x2 on cylinder spigot and lubricate cylinder.
NOTE: On the type 912 S/ULS/ULSFR an O-ring 7x2 at the
cylinder base for damping of the studs has been intro-
1
duced with start of serial production. See the groove at
top top
the cylinder base.
Pay attention to position of piston ring gaps Q. The gap of the
st
1 and 3
and the 2
be in the area of the piston pin bore.
Check whether piston pin circlips are installed. Lubricate
piston, compress rings with piston ring spanner and mount
the coordinated cylinder with care. Same procedure with the
other cylinders.
CAUTION: To avoid ring breakage, use piston ring spanner!
Fitting of cylinder head
See fig. 193, 194 and 195.
5
4
00278
fig. 193
rd
piston ring should be in the middle of piston skirt,
nd
ring be turned by 180°. The ring gap should never
Install respective pushrod Q in both oil return
tubes on pre-assembled cylinder head and
place pre-oiled O-ring W 16x5 on oil return
tube E.
Mount cylinder head until O-rings W on both
oil return tubes rest in crankcase R. Now lift
3 cylinder T until the centering Y of cylinder
engages in the cylinder head recess U.
NOTE:
2
Fit cylinder head and cylinder together on
crankcase. Tighten cylinder head crosswise
with 2 collar cap nuts M8 and 2 hex. nuts M8
along with washers, tightening slightly only!
Pay attention for squeezing O-rings W evenly
into crankcase.
1
Repeat same procedure, if necessary, on the
cylinder heads.
This is a safety measure to
prevent jamming of cylinder
head resulting in leakage.
page 116
Initial issue, Jan. 01/2002