Yanmar 3TNV82A-B Service Manual page 179

2-Valve Cylinder Head
3. Lightly oil the threads of the cylinder head bolts
(Figure 6-33, (1)). Tighten the bolts to the
specified torque in two steps as shown in the
chart below. Tighten in the sequence shown in
(Figure 6-34). See Special Torque Chart on
page 6-25 for specification.
First Step
Second Step
4. Insert the push rods in their respective
positions.
7
13 3
11 5
9
12 3
18 10
16 8
14 6
1 – Fan End
2 – Camshaft Side
Figure 6-34
Reassembly of Rocker Arm Reassembly
Note: Ensure the lubrication holes
(Figure 6-35, (1)) in the rocker arm shaft
are oriented correctly with respect to the
rocker arms (Figure 6-35, (2)).
(1)
Figure 6-35
TNV DI Service Manual
1/2 of final torque
Final torque
(2)
1 10
6 12
(1)
4 14
2 8
(2)
5 13
1 7 15
(1)
2 9 17
4 11
0001875
(2)
(1)
0001914
1. Lubricate the rocker arm shaft. Slide the rocker
arm supports (Figure 6-36, (5)), springs
(Figure 6-36, (1)) and rocker arms
(Figure 6-36, (2)) onto the shaft.
Note: The rocker arm shaft fits tightly in the
rocker arm supports. Clamp the support
in a padded vise. Twist and push on the
rocker arm shaft to reinstall.
Note: To properly align the rocker arm shaft
with the rocker arm shaft supports, first
reinstall a rocker arm support
(Figure 6-36, (5)) having a hole for the
shaft alignment stud (Figure 6-36, (4)).
Align the hole in the rocker arm shaft and
the hole in the rocker arm support.
Reinstall the alignment stud.
(7)
(6)
(1)
Figure 6-36
Note: Figure 6-36 shows components for one
cylinder. Components for all remaining
cylinders are assembled in the same
order.
2. Place the rocker arm shaft assembly onto the
cylinder head.
3. If removed, reinstall the valve adjusting screws
(Figure 6-36, (6)) and the lock the nuts
(Figure 6-36, (7)).
4. Align the push rods with their respective rocker
arms.
5. Reinstall and tighten the rocker arm shaft
retaining bolts to the specified torque.
ENGINE
(2)
(3)
0001951
(4)
(5)
6-47