bpr Rotax 912 i Series, Maintenance Manual, Page: 217 / 458

Effectivity: 912 i Series
Edition 1/Rev. 0
d
059
35.
fm
MAINTENANCE MANUAL
BRP-Powertrain
72-30-10
Page 5
July 01/2012
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
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
NOTE:
Before the cylinders and pistons are re-
moved, they must be marked in pairs to
prevent confusion. The cylinders are all
identical. The pistons are axially offset!
Fig. 1
m
WARNUNG
m
WARNING
Danger of severe burns and scalds! Always
allow the engine to cool down to ambient tempe-
rature before starting any work.
Step Procedure
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.
1. Cylinders 2. Pistons
3. Marking arrow
m
WARNUNG
NOTICE
Pistons and piston rings can be damaged. Sup-
port pistons by hand!
Step Procedure
2 Support the piston by hand and carefully
remove the cylinder along with the O-ring.
m
WARNUNG
m
WARNING
The mono hook circlip is under stress!
m
WARNUNG
NOTICE
Cover the crankcase!
The mono hook circlip must not fall in.
Step Procedure
3 Remove the piston pin circlip with mono
hook circlip remover part no. 976380.