Yanmar 6LY3 series Service Manual page 111

Inspecting the Cylinder Block and Components
12/05
Inspecting the Crankshaft Pins and
Bearings
• Perform a dye penetrant inspection of the
crankshaft main bearing journals and the
connecting rod pins (Figure 5-57).
• Replace the crankshaft if any cracks or other
significant damage is found.
Figure 5-57
Figure 5-57
6LY3 Service Manual
Inspecting the Crankshaft Bend and
Deflection
• Support the crankshaft on V-blocks at both ends
main bearing journals.
• Rotate the crankshaft and measure the deflection
(Figure 5-58, (1)) of the center journal with a dial
indicator (Figure 5-59, (1)).
Figure 5-58
0005642
Figure 5-59
• Compare reading with specified limit.
© 2007 Yanmar Marine International
(2)
(1)
Figure 5-58
1 – Deflection
2 – Bend
1/2
(1)
Figure 5-59
1 – Dial Indicator
Crankshaft Bend Limit
1/2 the Dial Gauge Reading
0.03 mm
(0.0011 in.)
ENGINE
0005643
1/2
0005644
5-45