Yanmar 4TNV98, Service Manual

Page: 102 / 246

4TNV98 & 4TNE98 Diesel Engine Section 3. Engine 100
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.
4TNV98 Engine
4TNE98 Engine
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 73 for
specification.
First Step
1/2 of final torque
Second Step Final torque