bpr Rotax 912 i Series, Maintenance Manual, Page: 227 / 458

Effectivity: 912 i Series
Edition 1/Rev. 0
d
059
35.
fm
MAINTENANCE MANUAL
BRP-Powertrain
72-30-10
Page 15
July 01/2012
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
NOTE:
New hydraulic valve tappets are partially
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 re-
taining ring holds the piston in position
when the hydraulic valve tappet is remo-
ved. See
Fig. 11 and Fig. 13 .
Fig. 11
Fig. 12
PISTON - INSTALLATION
NOTE:
The pistons are axially offset. When the
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.
m
WARNUNG
NOTICE
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.
m
WARNUNG
NOTICE
If operating faults occur, such as operation with
a non-ventilated hydraulic valve tappet, the
components (plate) in the hydraulic valve tappet
is abraded.
Step Procedure
1 Lubricate the bearing bore for the hydrau-
lic valve tappet in the crankcase and con-
tact 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.
1. Bore 2. Retaining ring
1. Hydraulic valve tappet 2. Contact faces
Step Procedure
1 Install the piston in accordance with the
following figures.
NOTE: The eccentricity of the piston pin
bore is 1 mm.