Yamaha WaveRunner - Cylinder Head Installation

5-66
E
POWR
CYLINDER HEAD
3. Measure:
• Cylinder head warpage
Out of specification
→
Replace the cyl-
inder head.
Cylinder head warpage limit:
0.1 mm (0.004 in)
Measurement steps:
• Place a straightedge
1
and a thickness
gauge
2
across the cylinder head.
• Measure the warpage.
• If the limit is exceeded, replace the cylin-
der head.
Cylinder head installation
1. Install:
• Cylinder head
NOTE:
• Pass the timing chain through the timing
chain cavity.
• Lubricate the cylinder head nuts with engine
oil.
• Tighten the cylinder head nuts in the
sequence shown.
T
R
.
Cylinder head nut 1:
1st:
20 N • m (2.0 kgf • m, 14 ft • lb)
2nd:
121 ± 5°
Cylinder head nut 2:
1st:
20 N • m (2.0 kgf • m, 14 ft • lb)
2nd:
105 ± 5°
Cylinder head nut 3:
1st:
20 N • m (2.0 kgf • m, 14 ft • lb)
2nd:
140 ± 5°