Yanmar 3TNV82A-B, Service Manual

Page: 185 / 394

ENGINE
TNV DI Service Manual 6-53
4-Valve Cylinder Head
Removal of Rocker Arm Assembly
1. Remove the fuel injectors from the cylinder
head. See Removal of Fuel Injectors on
page 7-35.
2. Remove the bolts (Figure 6-44, (1)) that retain
the rocker arm shaft supports to the cylinder
head.
3. Remove the rocker arm and shaft assembly
from the cylinder head.
Note: Identify the push rods and valve bridges
so they can be installed in their original
locations.
4. Remove the push rods (Figure 6-44, (2)).
5. Remove the valve bridge assemblies
(Figure 6-44, (3)). Remove the seat
(Figure 6-44, (4)) from each valve bridge.
6. Identify all parts so that they will be reinstalled
in their original locations.
Figure 6-44
Disassembly of Rocker Arm Assembly
Note: Identify the rocker arms so they can be
reinstalled with the original matching
valve and pushrod.
1. Remove the rocker arm shaft alignment studs
(Figure 6-45, (5)) from the rocker arm shaft
supports (Figure 6-45, (6)).
2. Slide the supports, wave washers
(Figure 6-45, (7)), rocker arms
(Figure 6-45, (8)), and fuel injector retainers
(Figure 6-45, (4)) off the rocker shaft
(Figure 6-45, (1)), leaving these parts in order
on the bench surface.
Figure 6-45
Note: Figure 6-45 shows components for one
cylinder. Components for all remaining
cylinders are assembled in the same
order.
3. Remove the valve adjusting screw
(Figure 6-45, (2)) and the lock nut
(Figure 6-45, (3)) from the rocker arms.
(2)
(4)
(3)
(1)
000187
0001866
(7)
(6)
(8)
(5)
(1)
(4)
(2)
(3)
TNV_DI_SM_A4.book 53 ページ ２００７年１２月６日 木曜日 午前９時２３分