Rotax 912 i Series Maintenance Manual page 223

INSTALLATION
CYLINDER AND PISTON - INSTALLATION
Preparation
- Clean all parts carefully.
- Lightly grease or lubricate press-in parts and
gaskets.
INSTALLATION OF THE HYDRAULIC VAL-
VE TAPPET
NOTICE
WARNUNG
If a hydraulic valve tappet has to be replaced, it
must be ensured that a hydraulic valve tappet
with a polished cam running surface is used.
NOTICE
WARNUNG
If operating faults occur, such as operation with
a non-ventilated hydraulic valve tappet, the
components (plate) in the hydraulic valve tappet
is abraded.
New hydraulic valve tappets are partially
NOTE:
emptied depending on the bearing and
are pumped full of oil during the starting
process. The oil passes through the bore
into the hydraulic valve tappet. The retai-
ning ring holds the piston in position
when the hydraulic valve tappet is remo-
ved. See
Fig. 11 and Fig.
Step
1 Lubricate the bearing bore for the hydrau-
lic valve tappet in the crankcase and
contact faces with KLUEBER ISOFLEX
TOPAS Nb5051.
2 Install the circumferentially lubricated hy-
draulic valve tappet in the corresponding
place in the crankcase.
NOTE: The hydraulic valve tappet must
rotate in the crankcase without
resistance.
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
13.
Procedure
Fig. 11
1. Bore
Fig. 12
1. Hydraulic valve tappet
PISTON - INSTALLATION
The pistons are axially offset. When the
NOTE:
piston is installed, the arrow on the pis-
ton crown points towards the propeller
shaft. This means with axial offset down-
wards for cylinders 1 and 3 and with axial
offset upwards for cylinders 2 and 4.
Step
1 Install the piston in accordance with the
following figures.
NOTE: The eccentricity of the piston pin
bore is 1 mm.
2. Retaining ring
2. Contact faces
Procedure
72-30-10
Page 15
July 01/2012