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2003 Buell XB9S: Engine
HOME
CYLINDER HEAD INSTALLATION
CAUTION
Thoroughly clean and lubricate the threads of the cylin-
der head screws before installation. Friction caused by
dirt and grime will result in a false torque indication.
1.
Thoroughly clean and dry the gasket surfaces of cylin-
ders and cylinder heads.
2.
Install new O-rings over two ring dowels at the top of the
cylinder. Apply a very thin film of clean H-D 20W50
engine oil to O-rings before installation.
CAUTION
To ensure proper head gasket alignment, install new O-
rings over cylinder ring dowels before installing the head
gasket. Improper head gasket alignment will cause leaks.
3.
Install a new head gasket to cylinder.
4.
Carefully lower cylinder head over studs and position on
dowels. Use great care so as not to disturb head gasket.
5.
Lightly coat the threads and bottom face of the cylinder
head bolts in clean H-D 20W50 engine oil. Wipe off any
excess oil.
CAUTION
The procedure for tightening the head screws is critical
to proper distribution of pressure over gasket area. It
prevents gasket leaks, stud failure, and head and cylin-
der distortion.
6.
Start the cylinder head screws onto the cylinder studs,
two short bolts on the left side of the engine, two long
bolts on the right.
7.
See
Figure 3-87.
For each cylinder head, start with
screw numbered one, as shown. In increasing numerical
sequence (i.e. – 1, 2, 3 and 4):
a.
Tighten bolts to 96-120 in-lbs (11-14 Nm).
b.
Tighten bolts to 13-15 ft-lbs (18-20 Nm).
c.
Loosen all screws.
8.
After screws are loosened from initial torque, tighten
head screws in three stages. Tighten fasteners in
increasing numerical sequence (i.e. – 1, 2, 3 and 4).
a.
Tighten each screw to 96-120 in-lbs (11-14 Nm).
b.
Tighten each screw to 13-15 ft-lbs (18-20 Nm).
c. See
Figure 3-88.
Mark cylinder head and head
screw shoulder with a line as shown (View A).
d.
Turn all bolts an additional 85 -95 .
°
°
Figure 3-87. Head Screw Loosening/Tightening Sequence
Figure 3-88. Tightening Head Screws
Head Screw Loosening/Tightening Sequence
Rear Cylinder
Front Cylinder
3rd
2nd
1st
4th
1st
2nd
3rd
4th
x0128x3a
View
A
View
B
a0089x3x
Tighten head screws 1/4-turn in
the third stage of installation
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