Removing The Cylinder Head; Checking The Cylinder Head; Installing The Cylinder Head - Yamaha TMAX 2020 Service Manual

EAS30276

REMOVING THE CYLINDER HEAD

1. Remove:
• Cylinder head bolt
• Cylinder head nut
TIP
• Loosen the bolts and nuts in the proper se-
quence as shown.
• Loosen each nut 1/2 of a turn at a time. After all
of the nuts are fully loosened, remove them.
3
7
5
1
EAS30277

CHECKING THE CYLINDER HEAD

1. Eliminate:
• Combustion chamber carbon deposit
(with a rounded scraper)
TIP
Do not use a sharp instrument to avoid damag-
ing or scratching:
• Spark plug bore thread
• Valve seat
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.
Warpage limit
0.10 mm (0.0039 in)
G088954
4
4
8
2
6
2
2
a. Place a straightedge "1" and a thickness
gauge "2" across the cylinder head.
Thickness gauge
90890-03268
Feeler gauge set
YU-26900-9
1
G088957
b. Measure the warpage.
c. If the limit is exceeded, resurface the cylin-
der 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.
EAS30282

INSTALLING THE CYLINDER HEAD

1. Install:
• Dowel pin
• Cylinder head gasket
2. Install:
• Cylinder head
• Washer
New
• Cylinder head nut
• Cylinder head bolt
TIP
• Pass the timing chain through the timing chain
cavity.
• Lubricate the cylinder head nuts and washers
with engine oil.
3. Tighten:
• Cylinder head nut "1"–"6"
• Cylinder head bolt "7", "8"
• Cylinder bolt "9"
5-21
CYLINDER HEAD
2
New
New