Cub Cadet Yanmar 3TNV72 - Manual (Page 122)

ENGINE
TNV IDI Service Manual 6-23
Cylinder Head
Disassembly of Rocker Arm Assembly
1. Remove the rocker arm shaft alignment set
screw (Figure 6-5, (6)) from support
(Figure 6-5, (5)).
Figure 6-5
Note: On 3-cylinder models, the set screw is
located in the center support. On
2-cylinder models, the set screw is
located in the front (cooling fan) end
support.
2. Remove two circlips (Figure 6-5, (8)).
Note: The rocker arm shaft fits tightly in the
rocker arm supports. Clamp the support
in a padded vise. Twist and pull out on
the rocker arm shaft to remove. Reverse
this process when installing the rocker
arm shaft into the supports.
3. Slide the rocker arm shaft (Figure 6-5, (7)) out
of the rocker arm supports (Figure 6-5, (5)),
springs (Figure 6-5, (4)), and rocker arms
(Figure 6-5, (1)).
Note: Mark the rocker arms so they can be
reinstalled with the original matching
valve and pushrod.
4. Remove the valve adjusting screw
(Figure 6-5, (3)) and lock nut (Figure 6-5, (2))
from the rocker arms. Mark parts so they can
be reinstalled on the same rocker arm.
Removal of Cylinder Head
1. Loosen the cylinder head bolts following the
sequence shown in Figure 6-6.
1 – Cooling Fan End
2 – Camshaft Side
Figure 6-6
2. Remove the cylinder head bolts
(Figure 6-7, (1)).
3. Lift the cylinder head away from the cylinder
block. Discard the cylinder head gasket
(Figure 6-7, (2)). Position the cylinder head on
the work bench to prevent damage to the
combustion surface.
Figure 6-7
0002160
(7)
(8)
(6)
(9)
(1)
(8)
(5)
(4)
(3)
(2)
(1)
(2)
0002148
8
6
2
4
5
7
9
10
3
1
(1)
(2)
8
6
4
2
14
13
10
12
5
7
11
9
1
3
0002150
(1)
(2)
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