Yanmar 3TNV82A-B Service Manual page 177

2-Valve Cylinder Head
2. Immediately after removing the valve guides
from the freezer, insert the valve guides
(Figure 6-28, (1)) in their proper positions.
Figure 6-28
3. Finish installing the valve guides
(Figure 6-29, (1)) into the cylinder head to the
proper height (Figure 6-29, (3)) using the valve
guide installation tool (Figure 6-29, (2)). See
Valve Guide Projection specification starting on
page 6-7.
Figure 6-29
TNV DI Service Manual
(1)
001689
(2)
(3)
(1)
0001756A
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 either the paint marks on the
outside of the seals or by the color of the
seal spring (Figure 6-30, (4)). Ensure they
are installed in the correct locations.
Engine Model
3TNV84, 3TNV88,
3TNV84T, 4TNV84,
4TNV88
3TNV82A
1. Oil the lip of the valve stem seal
(Figure 6-30, (2)). Using the valve stem seal
installation tool (Figure 6-30, (1)), install a new
valve stem seal on each of the valve guides
(Figure 6-30, (3)).
Figure 6-30
2. Measure the distance (Figure 6-31, (1)) from
the cylinder head to valve stem seal to ensure
proper clearance (Figure 6-31, (2)) between
the guide and the seal. See Valve Stem Seal
Projection specification on page 6-9.
ENGINE
Marking
Intake Exhaust
Yellow (Paint
None on outside of
seal)
Black (Seal
None
Spring)
(1)
(4)
(2)
(3)
0001873B
6-45