Yanmar 6LPA-STP2 Service Manual page 101

Cylinder Head
12/05
6. Clean all valve guide internal surfaces using a
brush and solvent (Figure 5-21).
Figure 5-21
Figure 5-21
7. Thoroughly clean the cylinder head deck
surface using a soft brush and solvent
(Figure 5-22).
Figure 5-22
Figure 5-22
8. Measure the flatness of the cylinder head deck
surface using a straight edge and feeler gauge
(Figure 5-23).
• Maximum warpage: 0.20 mm
If the measured warpage exceeds the specified
maximum, replace the cylinder head.
6LPA Service Manual
Figure 5-23
9. Check the intake and exhaust ports and the
cylinder head deck surfaces for cracks, using a
color check agent (Figure 5-24). If any cracks
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are discovered, replace the cylinder head.
Figure 5-24
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© 2007 Yanmar Marine International
ENGINE
Figure 5-23
Figure 5-24
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5-21