Rotax MMH-912 Series Maintenance Manual page 131

3.11.1) Cylinder head and exhaust manifold studs
Fig. 72-60
1
07447
Effectivity 912/914 Series
Edition 1 / Rev. 3
BRP-Powertrain
Maintenance Manual
See Figs. 72-60, 72-61 and 72-62.
Studs M8 x 20/23 (1) are for attaching the exhaust manifold. Check for
tight fit and any damage.
When replacing a stud, it is fitted so that the longer thread (23 mm
(0.91 in.)) is screwed into the cylinder head. Secure studs with
LOCTITE 648.
Tightening torque 8 Nm (70 in.lb).
■ CAUTION: If the engine has been overheated, the hardness of the
cylinder head must be checked. See the corresponding
Maintenance Manual (Line Maintenance) for the re-
spective engine type, 912 Series or 914 Series. Hard-
ness is tested at control point CH08 as shown in Fig. 72-
61.
Procedure for hardness test:
CH08: HB2.5/62.5 DIN EN ISO 6506-2
■ CAUTION: The results of the hardness test must be entered in
72-00-00 sec. 5.
1
Fig. 72-61
07424
CH08
72-00-00
page 59
October 01/2010