Yamaha ROADLINER XV19SW, Service Manual

Page: 247 / 444

CYLINDER HEADS
5-35
EAS24140
REMOVING THE CYLINDER HEADS
1. Remove:
• Cylinder head nuts
NOTE:
• Loosen the nuts in the proper sequence as
shown.
• Loosen each nut 1/2 of a turn at a time. After all
of the nuts are fully loosened, remove them.
EAS24170
CHECKING THE CYLINDER HEADS
The following procedure applies to all of the cyl-
inder heads.
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.
3. Measure:
• Cylinder head warpage
Out of specification
→
Resurface the cylinder
head.
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a. Place a straightedge and a thickness gauge
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.
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EAS24220
CHECKING THE OIL PIPE
1. Check:
• Oil pipe 1
Damage
→
Replace.
Obstruction
→
Wash and blow out with com-
pressed air.
A. Front cylinder
B. Rear cylinder
2
4
3
1
A
2
4
3
1
B
Warpage limit
0.03 mm (0.0012 in)