ENGINE
Inspecting the Cylinder Block and Components
5-48
6LY3 Service Manual
© 2007 Yanmar Marine International
Inspecting the Camshaft and Tappets
The camshaft
(Figure 5-64, (1))
is normalized. The
cam lobes and bearing surfaces are surface
hardened and ground with a curve that minimizes
the repeated shocks on the valve seats and
maximizes valve seat life.
Figure 5-64
Figure 5-64
1 – Camshaft
2 – Push Rod
3 – Tappet
4 – Camshaft Bearing
5 – Thrust Bearing
6 – Camshaft Gear
Inspecting the Camshaft Side Clearance
NOTICE: Measure the thrust clearance before
disassembling.
The cam gear
(Figure 5-65, (1))
and camshaft are
assembled using a shrink-fit. Use caution when
replacing the cam thrust bearing.
Figure 5-65
Figure 5-65
1 – Cam Gear
2 – Thrust Metal
3 – Side Clearance
• Measure the height of each cam lobe as shown in
Figure 5-66
.
Figure 5-66
Figure 5-66
• Replace the cam if any lobes are worn beyond
the stated limit.
Camshaft Side Clearance
Standard
Limit
0.05-0.20 mm
(0.0019-0.0078 in.)
0.29 mm
(0.0114 in.)
0005649
(1)
(2)
(
3
)
(4)
(6)
(5)
0005650
(1)
(2)
(
3
)
0005651
