Rotax 912 i Series Maintenance Manual page 190

If the sealing cone of the exhaust ma-
NOTE:
nifold leaks, post-machining is per-
missible. If post-machining is neces-
sary, the cylinder head must be sent
to an authorised ROTAX overhauling
company.
Fig. 15
1. Cone (exhaust manifold)
NOTICE
WARNUNG
Cracks in the cylinder head are not permissible!
If in doubt, inspect the affected parts for cracks
using then dye penetrant method.
Step
2 Check the spark plug bore.
Check the thread for damage.
3 Check the sealing surface of the cylinder
block.
Fig. 16
1. Sealing surface
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Procedure
2. Spark plug bore
HARDNESS TEST METHOD:
NOTICE
WARNUNG
If the engine has been overheated, a hardness
test of the cylinder head is necessary. See the
current Maintenance Manual Line for the
912 i Series engine type. The hardness test
takes place at measurement point CH08
according to Fig. 17.
CH08: HB2,5/62,5 DIN EN ISO 6506-2
NOTICE
WARNUNG
The results of the hardness test must be noted
in section 72-30-00, subsection: Wear limits.
Fig. 17
1. Cylinder head
If the rocker arm shaft bearing (CH05)
NOTE:
is worn, it can be post-machined to a
certain extent. The cylinder head
must be sent to an
authorised ROTAX overhauling com-
pany.
72-30-00
Page 12
July 01/2012