Checking The Valve - SELVA MARINE Manta 40 Manual De Servicio

POWR
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CYLINDER HEAD
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3. Measure:
• Valve seat width
Out of specification → Reface the
valve seat.
Valve seat width
0.9 - 1.1mm
(0.035 - 0.043 in)

CHECKING THE VALVE

1. Check:
• Valve
Deformation → Replace.
2. Measure:
• Margin thickness
Out of specification → Replace.
Margin thickness
IN 0.6 - 1.0 mm
(0.024 - 0.039 in)
EX 0.7 - 1.1 mm
(0.028 - 0.043 in)
3. Measure:
• Valve stem diameter
Out of specification → Replace.
Valve stem diameter
IN 5.475 - 5.490 mm
(0.2156 - 0.2161 in)
EX 5.460 - 5.475 mm
(0.2150 - 0.2155 in)
4. Measure:
• Valve stem run-out
Out of specification → Replace.
Stem run-out limit
IN, EX 0.016 mm (0.0006 in)
NOTE:
The valve guide and valve stem seal should
be replaced when the valve is replaced.
5-31
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