Yanmar 6LY3 series Service Manual page 112

ENGINE
Measuring the Crank Pins and the Main
Bearing Journals
• Measure the outside diameter, roundness and
taper at each crank pin and journal as shown in
Figure 5-60 and Figure 5-61.
Figure 5-60
Figure 5-60
Figure 5-61
Figure 5-61
• Resurface the crankshaft pins and main bearing
journals if measurements exceed the listed
specifications.
• Replace if the defect is excessive.
Crankshaft Pin and Main Bearing Journals
Item
Roundness / Taper
NOTICE: To determine the oil clearance of the
crank pin, measure the inside diameter of the
connecting rod crank pin bearing.
5-46
Inspecting the Cylinder Block and Components
0005645
0005646
Limit (Diameter)
0.01 mm
(0.0003 in.)
© 2007 Yanmar Marine International
Crank Pin
64.952-64.964 mm
Outside Diameter
(2.5571-2.5576 in.)
0.036-0.093 mm
Oil Clearance
(0.0014-0.0036 in.)
Crank Journal
74.952-74.964 mm
Outside Diameter
(2.9508-2.9513 in.)
0.036-0.093 mm
Oil Clearance
(0.0014-0.0036 in.))
Inspecting the End Play of the Crankshaft
• Assemble the crankshaft to the engine block.
• Tighten the main bearing caps to the specified
torque.
• Move the crankshaft along its horizontal axis from
end to end.
• Install a dial indicator (Figure 5-62, (1)) on one
end of the crankshaft to measure crankshaft end
play.
Figure 5-62
Figure 5-62
1 – Dial Indicator
• Replace the thrust bearing if it is worn beyond the
stated limit.
Crankshaft Side Clearance
Standard
0.132-0.223 mm
(0.0051-0.0087 in.)
6LY3 Service Manual
Standard Limit
64.90 mm
(2.5551 in.)
0.160 mm
(0.0062 in.)
Standard Limit
74.90 mm
(0.0062 in.)
0.15 mm
(0.0059 in.)
(1)
0005647
Limit
0.29 mm
(0.0114 in.)