Removing The Cylinder Head; Checking The Cylinder Head; Installing The Cylinder Head - Yamaha 2009 Diversion XJ6S Service Manual

EAS24120

REMOVING THE CYLINDER HEAD

1. Remove:
Cylinder head bolts
G
TIP
Loosen the bolts in the proper sequence as
G
shown.
Loosen each bolts 1/2 of a turn at a time. After
G
all of the bolts are fully loosened, remove them.
7 11
5
4
12
10
EAS24160

CHECKING THE CYLINDER HEAD

1. Eliminate:
Combustion chamber carbon deposits
G
(with a rounded scraper)
TIP
Do not use a sharp instrument to avoid damag-
ing or scratching:
Spark plug bore threads
G
Valve seats
G
2. Check:
Cylinder head
G
Damage/scratches → Replace.
Cylinder head water jacket
G
Mineral deposits/rust → Eliminate.
3. Measure:
Cylinder head warpage
G
Out of specification → Resurface the cylinder
head.
Warpage limit
0.05 mm (0.0020 in)
1
3
9
2
8
6
5-17
CYLINDER HEAD
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
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.
TIP
To ensure an even surface, rotate the cylinder
head several times.
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EAS24240

INSTALLING THE CYLINDER HEAD

1. Install:
Cylinder head gasket "1"
G
Dowel pins "2"
G
2
1
New
2