Inspecting The Tappets - Yanmar 6LY3 series Service Manual

ENGINE

Inspecting the Tappets

The tappets are offset (Figure 5-68, (1)) to rotate
during operation and prevent uneven wear.
Figure 5-68
(1)
Figure 5-68
1 – Offset
Figure 5-69
(1)
Figure 5-69
1 – Notches
NOTICE: When removing tappets, keep them
separate from each cylinder. The exhaust valve
tappet side has two notches (Figure 5-69, (1)) on
the top of the tappet. The tappet for the intake valve
has no notch.
• Check the contact area of each tappet.
• Replace if excessively or unevenly worn.
Figure 5-70
(1)
Figure 5-70
1 – Abnormal Contact Area
2 – Normal Contact Area
5-50
Inspecting the Cylinder Block and Components
• Measure the outer diameter of the tappet
• Replace if worn beyond the stated limits.
(1)
0005654
Figure 5-71
0005655
(2)
0005653
© 2007 Yanmar Marine International
(Figure 5-71).
Tappet Specifications
Tappet Stem Outside 14.218-14.233 mm
Diameter (0.5597-0.5603 in.)
Tappet Guide Hole
14.249-14.270 mm
Inside Diameter
(0.5609 -0.5618 in.)
(cylinder block)
0.016-0.052 mm
Oil Clearance
(0.0006-0.0020 in.)
Figure 5-71
6LY3 Service Manual
Standard Limit
14.17 mm
(0.5578 in.)
14.30 mm
(0.5629 in.)
0.10 mm
(0.0039 in.)
0005656