Yanmar 3TNV82A Service Manual page 184

ENGINE
7. Insert the valve keepers (Figure 6-66, (1)) and
slowly release the tension in the valve spring.
Repeat the steps on all the remaining valves.
Reassembly of Cylinder Head
1. Carefully clean both the combustion surface of
the cylinder head and the top surface of the
cylinder block. Then place a new cylinder head
gasket (Figure 6-67, (2)) on the cylinder block.
2. Position the cylinder head on the on the cylinder
head gasket.
Figure 6-67
3. Lightly oil the threads of the cylinder head bolts
(Figure 6-67, (1)). Tighten the bolts to the
specified torque in two steps as shown in the
chart below. Tighten in the sequence shown in
(Figure 6-68). See Special Torque Chart on
page 6-23 for specification.
First Step
Second Step
6-58
(1)
(2)
0001872
1/2 of final torque
Final torque
7
13 3
11 5
9
12 3
18 10
16 8
14 6
1 – Fan End
2 – Camshaft Side
Figure 6-68
Reassembly of Rocker Arm Assembly
1. Reinstall the valve bridges (Figure 6-69, (3)) in
their original locations and ensure each seat
(Figure 6-69, (4)) is in place.
2. Insert the push rods (Figure 6-69, (2)) in their
original locations.
(4)
(3)
Figure 6-69
TNV DI Service Manual
4-Valve Cylinder Head
(2)
1 10
6 12
(1)
4 14
2 8
(2)
5 13
1 7 15
(1)
2 9 17
4 11
0001875
(1)
(2)
0001871