Yanmar 2TNV70 Service Manual page 114

ENGINE
3. Finish installing the valve guides
(Figure 6-25, (1)) to the proper height
(Figure 6-25, (3)) using the valve guide
installation tool (Figure 6-25, (2)). See valve
guide projection specification on page 6-5.
Figure 6-25
Reassembly of Intake and Exhaust Valves
IMPORTANT
Always install new valve stem seals.
The exhaust valve stem seals are different
than the intake valve stem seals and can be
identified by the color the seal spring
(Figure 6-26, (4)). Ensure they are installed
in the correct locations.
Engine Model
2TNV70, 3TNV70,
3TNV76
1. Oil the lip of the valve stem seal
(Figure 6-26, (2)). Using the valve stem seal
installation tool (Figure 6-26, (1)), install a new
valve stem seal on each of the valve guides
(Figure 6-26, (3)).
6-28
(2)
(3)
(1)
0001756A
Marking
Intake Exhaust
White (Seal Black (Seal
Spring) Spring)
Figure 6-26
2. Measure the distance (Figure 6-27, (1)) from
the cylinder head to valve stem seal to ensure
proper clearance (Figure 6-27, (2)) between
the valve guide and seal. See valve stem seal
projection specification on page 6-5.
(2)
(1)
Figure 6-27
3. Put the cylinder head assembly on its exhaust
port side.
4. Install all the valves (Figure 6-28, (6)) in their
proper location in the cylinder head.
TNV IDI Service Manual
Cylinder Head
(1)
(4)
(2)
(3)
0001873B
0001874