Inspection; Cylinder Head Single Parts Check; Cylinder Head Studs Check; Cylinder Head Assy. - Inspection - Rotax 915 i A series Maintenance Manual

INSPECTION

CYLINDER HEAD
SINGLE PARTS CHECK
Preparation
Clean all parts carefully.
See Maintenance Manual Line for the en-
gine type 915 i A Series Chapter 05-00-00
section Procedure.

CYLINDER HEAD STUDS CHECK

Procedure
Step
1 M8x20/23 studs are used to attach the
exhaust manifold.
2 Check that they are securely fitted and
undamaged.
3 If replacement is necessary, the stud is in-
stalled in such a manner that the longer
thread (23 mm (0.91 in.)) is screwed into
the cylinder head.
4
Secure studs with LOCTITE 648. Tighten-
ing torque 8 Nm (70 in. lb.).
Figure 8.17
1 Stud
Effectivity: 915 i A Series
Edition 0/Rev. 0
BRP-Rotax
MAINTENANCE MANUAL HEAVY
CYLINDER HEAD ASSY. — INSPECTION
Step Procedure
1 Inspect the cone of the exhaust manifold.
Indentations and scratches no greater
than 0.2 mm (0.0079 in.) are permissible.
Bumps no greater than 0.1 mm (0.0039
in.) are permissible.
NOTE
If the sealing cone of the exhaust manifold
leaks, post-machining is permissible. If post-ma-
chining is necessary, the cylinder head must be
sent to an authorised ROTAX® overhaul facility.
Figure 8.18
Cone (exhaust
1
manifold)
ATTENTION
Cracks in the cylinder head are not permissi-
ble! If in doubt, inspect the affected parts for
cracks.
Step Procedure
2 Check the spark plug bore.
Check the thread for damage.
3 Check the sealing surface of the cylinder
block.
72–30–00
Page 15
August 01 2018