ENGINE
Inspecting the Cylinder Block and Components
12/05
6LY3 Service Manual
5-41
© 2007 Yanmar Marine International
Inspecting the Connecting Rods
The connecting rod
(Figure 5-48, (1))
is made of
high-strength forged carbon steel. The large
crankshaft bearing is equipped with a bearing cap
and a 2-piece aluminum bearing insert assembly.
The piston pin bearing
(Figure 5-48, (2))
is a
non-serviceable copper alloy bushing that is
factory-installed.
Figure 5-48
Figure 5-48
1 – Connecting Rod
2 – Piston Pin Bearing
3 – Crank Pin Bearing Inserts
4 – Connecting Rod Cap
5 – Connecting Rod Cap Bolts
Inspecting the Connecting Rod Bearing
Alignment
Ensure that the connecting rod is not twisted.
• Insert the appropriate mandrel
(Figure 5-49, (3))
into both ends of the
connecting rod.
Figure 5-49
Figure 5-49
1 – Parallel Measurement
2 – Twist Measurement
3 – Mandrel
• Measure alignment.
• Replace connecting rod if it exceeds the stated
limits.
Figure 5-50
Figure 5-50
1 – Connecting Rod Tool
2 – Twist Measurement Using a Rod Alignment
Tool
00056
3
2
(2)
(
3
)
(5)
(4)
(1)
Connecting Rod Twist
Standard
Limit
Less than 0.05 mm
(0.0019 in.)
(at 100 mm (3.936 in.))
0.07 mm
(0.0027 in.)
00056
33
(1)
(2)
(
3
)
100mm
100mm
00056
3
4
(1)
(2)
