Yanmar 6LPA-STP2 Service Manual page 138

ENGINE
11. Measure the twist of the connecting rod.
• Maximum twist: 0.15 mm (0.006 in.) per
100 mm (3.936 in.)
If the measured twist exceeds the specified
maximum, replace the connecting rod assembly.
12. Inspect the connecting rod bolt. Measure the
tension portion diameter using calipers
(Figure 5-122).
• Standard diameter: 8.300 to 8.400 mm
(0.326 to 0.030 in.)
• Minimum diameter: 7.95 mm (0.313 in.)
If the measured diameter is less than the
specified minimum, replace the connecting rod
bolt.
Figure 5-122
Figure 5-122
13. Inspect the oil clearance of the piston pin.
Measure the inside diameter of the piston pin
bearing using a caliper gauge (Figure 5-123).
• Inside diameter of piston pin bearing: 33.008 to
33.020 mm (1.2995 to 1.2999 in.)
5-58
Figure 5-123
14. Measure the piston pin diameter using a
micrometer (Figure 5-124).
• Piston pin diameter: 33.000 to 33.012 mm
(1.2992 to 1.2996 in.)
Figure 5-124
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15. Subtract the measured piston pin diameter from
the measured inside diameter of the piston pin
bearing.
• Standard oil clearance: 0.004 to 0.020 mm
(0.0001 to 0.0008 in.)
• Maximum oil clearance: 0.03 mm (0.001 in.)
If measured oil clearance exceeds the specified
maximum, replace the piston pin bearing. When
necessary, replace the piston and piston pin as
an assembly.
Note: If the piston pin bearing needs to be
replaced, replace by the connecting rod
assembly.
© 2007 Yanmar Marine International
Cylinder Block
Figure 5-123
Figure 5-124
6LPA Service Manual
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