Cylinder And Piston Disassembly - Rotax 912 Series Maintenance Manual

14.6) Cylinder and Piston disassembly

See fig. 173 and 174.
NOTE:
Set piston to top dead centre position and with arrow mark facing gearbox. This arrow
Q has to face gearbox on all 4 cylinders and serves as positioning aid for the pistons
having offset centres.
1
fig. 173
00290
9
R
00291
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL II
Prior to removal, mark cylinders and pistons to ensure correct
position at reassembly. Cylinders are identical, pistons have offset
centres of pin to piston!
Withdraw cylinder carefully. Support piston by hand to avoid
damaging piston and piston rings, see para 11.6. After mov-
ing circlips W remove piston pin circlips using the specially
shaped screwdriver E, see para 11.4.
Push out piston pin using guide punch with puller R, part no.
877 091 , see para 11.6. Insert puller spindle T into piston pin
Y and screw nut U onto it. Turning the spindle clockwise, the
piston pin is pulled out of the conrod I into the puller sleeve
O until the piston P can be removed.
Remove nut U and the puller ass´y.
Coordinate piston pin to keep each piston pin with its respec-
tive piston for reassembly.
2
3
5
10
8
6
Initial issue, Jan. 01/2002
7
fig. 174
page 109