Yanmar 4TNE98, Service Manual

Page: 93 / 246

4TNV98 & 4TNE98 Diesel Engine Section 3. Engine 91
Figure 6-7
4. .If necessary, remove the valve adjusting screw
(Figure 6-7, (7)) and lock nut (Figure 6-7, (8))
from the rocker arms.
Removal of Cylinder Head
1.
Loosen the cylinder head bolts following the
sequence shown in (Figure 6-8) .
1. Fan Side
2. Camshaft Side
Figure 6-8
2. Remove the cylinder head bolts (Figure 6-9, (1)) .
3. Lift the cylinder head away from the cylinder block.
Discard the cylinder head gasket (Figure 6-9, (2)) .
Position the cylinder head on the work bench to
prevent damage to the combustion surface.
Figure 6-9
Removal of Intake / Exhaust Valves
1.
Place the cylinder head on the work bench with
the combustion side down.
2. Using the valve spring compressor tool, compress
one of the valve springs (Figure 6-10) .
Figure 6-10
3. Remove the valve keepers (Figure 6-11, (2)) and
valve cap (Figure 6-10, (1)) from the end of the
valve.