Yanmar 6LPA-STP2 Service Manual page 131

Cylinder Block
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27. Completely remove the plastigage.
28. Lift and remove the crankshaft (Figure 5-98).
Figure 5-98
Figure 5-98
29. Remove the upper bearing and thrust bearing
from the cylinder block.
Keep the main bearing and thrust bearing
together in order for reassembly.
30. Remove the check valve and oil nozzle (for
piston cooling). See Oil Nozzle Disassembly
and Inspection on page 8-17.
Cylinder Block Inspection
1. Use a scraper to remove any remaining gasket
material from the top of the cylinder block
(Figure 5-99).
Figure 5-99
Figure 5-99
2. Thoroughly clean the cylinder block using a soft
brush and solvent.
6LPA Service Manual
3. Measure the top deck surface of the cylinder
block using a precision straight edge and feeler
gauge (Figure 5-100).
• Maximum warpage is 0.20 mm (0.008 in.)
If the measured warpage exceeds the maximum,
replace the cylinder block.
Figure 5-100
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4. Visually check the cylinders for vertical
scratches. If deep scratches are present, bore
the cylinders or replace as needed
(Figure 5-101).
Figure 5-101
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© 2007 Yanmar Marine International
ENGINE
Figure 5-100
Figure 5-101
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