Rotax 912 i Series Maintenance Manual page 213

SYSTEM DESCRIPTION
In the 912 i Series engine, 4 cylinders with "GIL-
NISIL"-coated running surfaces are used. The
pistons are light alloy full skirt pistons. The piston
axle is axially offset by 1 mm (0.03937 in.) with
respect to the piston skirt.
SAFETY INFORMATION
WARNUNG WARNING
Danger of severe burns and scalds! Always
allow the engine to cool down to ambient tem-
perature before starting any work.
MAINTENANCE
As well as the maintenance and special checks,
see the relevant Maintenance Manual Line for
the respective 912 i Series engine type.
REMOVAL
Preparation
- Remove the cylinder head. See section
72-30-00.
CYLINDER AND PISTON - REMOVAL
Before the cylinders and pistons are re-
NOTE:
moved, they must be marked in pairs to
prevent confusion. The cylinders are all
identical. The pistons are axially offset!
Step
1 Put the piston in the TDC position and ap-
ply the marking arrow in the direction of
the gearbox.
NOTE: When the piston is cleaned the
marking arrow becomes visible.
It points in the direction of the
gearbox for all four cylinders and
aids correct assembly of the axi-
ally offset piston.
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Procedure
Fig. 1
1. Cylinders
3. Marking arrow
NOTICE
WARNUNG
Pistons and piston rings can be damaged. Sup-
port pistons by hand!
Step
2 Support the piston by hand and carefully
remove the cylinder along with the O-ring.
WARNUNG WARNING
The mono hook circlip is under stress!
NOTICE
WARNUNG
Cover the crankcase!
The mono hook circlip must not fall in.
Step
3 Remove the piston pin circlip with mono
hook circlip remover part no. 976380.
2. Pistons
Procedure
Procedure
72-30-10
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July 01/2012