Yanmar 4TNV98, Service Manual

Page: 129 / 246

4TNV98 & 4TNE98 Diesel Engine Section 3. Engine 127
CAUTION
Do not allow the honing tool to operate in one
position for any length of time. Damage to the
cylinder wall will occur. Keep the tool in
constant up-and-down motion.
Figure 6-125
• Use a 50:50 mixture of diesel fuel and engine oil as
a honing fluid.
• Use a 300-grit hone at 300 - 1200 rpm
(Figure 6-126) .
Figure 6-126
IMPORTANT
Solvents will not adequately remove honing residue,
resulting in premature piston and ring wear. Always
wash cylinders using hot, soapy water.
• When honing is completed, wash the cylinder
block with hot water and soap. The cylinder wall
is adequately cleaned when a white rag wiped in
cylinder comes out clean. Use brushes to clean
all passages and crevices. Rinse with hot water
and dry with compressed air. Apply clean engine
oil to all steel surfaces to prevent rusting.
Reassembly of Crankshaft and Piston
Components
NOTES
• Proceed slowly. Make no forced assemblies
unless a pressing operation is called for. All parts
must be perfectly clean and lightly lubricated
when assembled.
• Use new gaskets, seals and O-rings during
assembly.
• Liberally apply clean engine oil to all internal
parts during assembly.
• All fasteners should be tightened to a given
torque. If a special torque is not provided in the
Special Torque Chart on page 73, tighten to
standard torque specifications. See Tightening
Torques for Standard Bolts and Nuts on page 4-
33.
Reassembly of Pistons
4TNV98 Engine
1. Select the parts needed to reassemble the piston
and connecting rod for one cylinder.
2. If removed, install a new wrist pin bushing
(Figure 6-127, (7)) using a press and the
appropriate service tool. Be sure to align the oil
holes.