Yanmar 4TNV98, Service Manual

Page: 119 / 246

4TNV98 & 4TNE98 Diesel Engine Section 3. Engine 117
IMPORTANT
Mark the connecting rod caps and connecting rods
so the caps and connecting rods stay together.
(a) Remove the bearing cap. Do not remove the
bearing inserts at this time.
(b) Wipe oil from the bearing insert and crankshaft
journal surfaces.
(c) Place a piece of PLASTIGAGE®
(Figure 6-98, (1)) along the full width of the
bearing insert.
Figure 6-98
IMPORTANT
Do not rotate the crankshaft when using
PLASTIGAGE. A false reading may result.
(d) Reinstall bearing cap and tighten to specification.
See Special Torque Chart on page 73.
(e) Remove bearing cap.
(f) Compare the width of the flattened PLASTIGAGE
to the graduation marks on the package (Figure
6-99, (1)) . The mark that most closely matches
the width of the flattened PLASTIGAGE will
indicate the bearing oil clearance.
Figure 6-99
(g) Repeat with remaining connecting rods.
IMPORTANT
Do not allow the connecting rod to contact the
crankshaft journal during piston removal. Damage to
the bearing journal may result.
3. Use a wooden dowel against the connecting rod
and tap the piston / connecting rod assembly out
of the cylinder.
4. Mark the cylinder number on the piston and
connecting rod.
5. Remove the bearing inserts (Figure 6-100, (2)) .
6. Remove the compression rings (Figure 6-100,
(3)) from the piston using a piston ring expander.
7. Remove the oil ring (Figure 6-100, (4)) from the
piston using a piston ring expander.