Rotax 912 i Series Maintenance Manual page 217

If porosity is found, pores must not ex-
NOTE:
ceed a size of 0.4 mm (0.0157 in.) and
the pores must have a minimum spacing
of 8 mm (0.3150 in.).
Step
1 Clean the cooling fins of the cylinder and
remove carbon residues in the upper regi-
on of the cylinder bore.
2 Clean and check the sealing surfaces on
the upper side and rear side.
Fig. 9
1. Cooling fins
3. Sealing surface
Step
3 Measure the cylinder and enter the mea-
surement data (CY01/CY02/CY03). See
also section 72-30-10 Wear limits.
4 Determine the installation clearance. See
also section 72-30-10 Piston inspection.
HYDRAULIC VALVE TAPPET -
INSPECTION
Step
1 Check visually for damage and wear.
NOTE: The hydraulic valve tappet rota-
tes during operation, so there is
a uniform, rotationally symmetri-
cal support pattern on the cam
contact face.
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Procedure
2. Cylinder bore
Procedure
Procedure
If the tappet does not rotate, uneven
NOTE:
wear occurs on the contact face. If there
are uneven smooth areas, corroded are-
as/pitting, the tappet must be replaced.
NOTICE
WARNUNG
The hydraulic valve tappet must not be
reground on the end!
NOTICE
WARNUNG
Disassembly of the hydraulic valve tappet is
neither permissible nor necessary.
Fig. 10
1. Cam contact face 2. Uneven wear
72-30-10
Page 9
July 01/2012