Cylinder Head Installation - Buell XB 2008 Series Service Manual

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1. Push rod (2)
2. O-ring (2)
3. Push rod cover
4. Screws (4)
5. Push rod cover gasket
Figure 3-66. Push Rods and Push Rod Cover Assembly

CYLINDER HEAD INSTALLATION

NOTES
Push rods and covers must be installed prior to installing
cylinder heads.
Short head screws will be installed in the 1 and 2 positions,
and long head screws in the 3 and 4 positions.
Thoroughly clean and lubricate the threads of the cylinder
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 cylinders
and cylinder heads.
2. Install a new head gasket to cylinder.
3. Carefully lower cylinder head over studs and position on
dowels. Use great care so as not to disturb head gasket.
4. Lightly coat the threads and bottom face of the cylinder
head screws with clean H-D 20W50 engine oil. Wipe off
any excess oil.
3-46 2008 XB Service: Engine
1
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 cylinder distortion.
Always tighten in sequence shown.
5.
6.
2
3
7.
4
5
8.
9.
Turn engine over so that both lifters from the rocker box to be
installed are on the base circle of the cam (the lowest position).
10. See
11. See
Do not stretch gaskets while installing; position gaskets in cover
and use top rocker cover to press gaskets into position.
NOTE
Start the cylinder head screws onto the cylinder studs, two
short screws on the left side of the engine, two long bolts
on the right.
See Figure 3-67. For each cylinder head, start with screw
numbered one, as shown. In increasing numerical
sequence (i.e. - 1, 2, 3 and 4):
a. Tighten screws to 96-120 in-lbs (11-14 Nm).
b. Tighten screws to 13-15 ft-lbs (18-20 Nm).
c. Loosen all screws.
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 screws to 96-120 in-lbs (11-14 Nm).
b. Tighten screws to 13-15 ft-lbs (18-20 Nm).
c. See Figure 3-62. Using a grease pencil, mark a
straight line on the cylinder head bolt continuing the
line over onto the cylinder head.
d. Using the marks as a guide, turn each bolt 1/4 turn
or 90 degrees. Be sure to tighten the cylinder head
bolts in the sequence shown in
Assemble rocker arms and shafts to rocker boxes.
a. Generously lubricate rocker arms and shafts with
clean engine oil.
b. Assemble arms and shafts to boxes.
Lube push rod sockets of rocker arms with clean engine
oil.
NOTE
Figure 3-69. Install new gaskets. Place lower rocker
box assembly (with rocker arms and shafts) into position.
Place push rods in rocker arm sockets.
Figure 3-69. Install hardware attaching lower rocker
cover to cylinder head in the following order. After loosely
installing all fasteners, use a cross pattern on the four
large bolts that fasten the lower rocker box to head to
tighten and then torque to specifications. This will bleed
the tappets. Finish tightening remaining fasteners.
a. Tighten bolts (1) to 18-22 ft-lbs (24-30 Nm).
b. Tighten bolts (3) to 135-155 in-lbs (15-17.5 Nm).
c. Tighten screws (2) to 135-155 in-lbs (15-17.5 Nm).
NOTE
Figure 3-67.