Removing The Cylinder Head; Checking The Cylinder Head; Installing The Cylinder Head - Yamaha YZF-R6(V) 2006 Service Manual

EAS24120

REMOVING THE CYLINDER HEAD

1. Remove:
• Cylinder head bolts
• Cylinder head nuts
NOTE:
• Loosen the nuts, cap nuts, and bolts in de-
creasing numerical order (refer to the numbers
in the illustration).
• Loosen each nut 1/2 of a turn at a time. After all
of the nuts are fully loosened, remove them.
6 2
8
9
3 1
EAS24160

CHECKING THE CYLINDER HEAD

1. Eliminate:
• Combustion chamber carbon deposits
(with a rounded scraper)
NOTE:
Do not use a sharp instrument to avoid damag-
ing or scratching:
• Spark plug bore threads
• Valve seats
2. Check:
• Cylinder head
Damage/scratches → Replace.
• Cylinder head water jacket
Mineral deposits/rust → Eliminate.
3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cylinder
head.
4 10
12
11
7
5
5-16
CYLINDER HEAD
Warpage limit
0.05 mm (0.0020 in)
M MMM M MMM M M MMM M
a. Place a straightedge "1" and a thickness
gauge "2" across the cylinder head.
b. Measure the warpage.
c. If the limit is exceeded, resurface the cylinder
head as follows.
d. Place a 400–600 grit wet sandpaper on the
surface plate and resurface the cylinder head
using a figure-eight sanding pattern.
NOTE:
To ensure an even surface, rotate the cylinder
head several times.
L LLL L LLL L L LLL L
EAS24240

INSTALLING THE CYLINDER HEAD

1. Install:
• Cylinder head
NOTE:
Pass the timing chain through the timing chain
cavity.
2. Tighten:
• Cylinder head nuts "1"–"7", "10"
Cylinder head nut (1st)
25 Nm (2.5 m·kg, 18 ft·lb)
Cylinder head nut (final)
42 Nm (4.2 m·kg, 30 ft·lb)
• Cylinder head cap nuts "8", "9"
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
MMM
LLL