Cub-cadet Yanmar 3TNV72 User Manual download pdf (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

(1)

(2)

0002150

(1)

(2)

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