Yamaha WaveRunner FX140 Manuel D'entretien page 346

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.
Cylinder head nut 1, 2:
1st:
20 N • m (2.0 kgf • m, 14 ft • lb)
2nd:
49 N • m (4.9 kgf • m, 35 ft • lb)
Cylinder head nut 3:
1st:
20 N • m (2.0 kgf • m, 14 ft • lb)
2nd:
64 N • m (6.4 kgf • m, 46 ft • lb)
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