Yanmar 6LY3 series Service Manual page 108

ENGINE
Inspecting the Connecting Rod Side
Clearance
• Install the connecting rod to the crankshaft.
• Check the side clearance as shown in
Figure 5-51 and compare values with the stated
limits.
Connecting Rod Side Clearance
Standard
0.20-0.40 mm
(0.0078-0.0157 in.)
Figure 5-51
Figure 5-51
1 – Thickness Gauge
Inspecting the Crank Pin Bearings
Check for flaking, melting or seizure on the contact
surface of the crank pin bearings.
5-42
Inspecting the Cylinder Block and Components
Limit
0.45 mm
(0.0177 in.)
(1)
0005635
© 2007 Yanmar Marine International
Measuring Crank Pin Oil Clearance
• Measure the crank pin outside diameter.
• Measure the crank pin bearing inside diameter.
• Calculate the oil clearance from the difference of
the measured values. (See Measuring the Crank
Pins and the Main Bearing Journals on page 5-46
for measuring the crank pin outside diameter.)
• Replace the crank pin bearing if the oil clearance
exceeds the stated limits.
• Correct the crankshaft by grinding to a uniform
undersized dimension (if available).
• Use an oversized bearing insert in the connecting
rod, if available (Figure 5-52). NOTICE: When
measuring the inside diameter of connecting rod
bearing inserts, install the bearing inserts
correctly and tighten the connecting rod cap bolts
to the standard torque.
Rod Bolt Torque
132.1-141.9 N·m
(13.5-14.5 kgf·m)
(97.4-104.6 lb-ft)
Item
65.000-65.045 mm
Rod Bearing ID
(2.5590-2.5608 in.)
64.952-64.964 mm
Crank Pin O.D.
(2.5571-2.5576 in.)
Bearing 1.987-2.000 mm
Thickness (0.0782-0.0787 in.)
0.036-0.093 mm
Clearance
(0.0014-0.0036 in.)
An alternate procedure for measuring crank pin oil
clearance is to use a plastic gauge.
6LY3 Service Manual
Standard Limit
65.100 mm
(2.5629 in.)
64.902 mm
(2.5551 in.)
—
0.160 mm
(0.0062 in.)