Yanmar 4TNE98, Service Manual

Page: 136 / 246

4TNV98 & 4TNE98 Diesel Engine Section 3. Engine 134
Piston Orientation to Cylinder - By Model
Orient the piston identification mark stamped on top
of the piston on the fuel injection pump side of the
engine
When correctly assembled, the piston identification
mark
(Figure 6-138, (2)) stamped into the top of the
piston will be on the same side of the connecting rod
as the match marks
(Figure 6-138, (4)) stamped
into the connecting rod and connecting rod cap.
When installed in the cylinder, the piston
identification mark
(Figure 6-138, (2)) stamped on
the top of the piston must face the fuel injection
pump side
(Figure 6-138, (1)) of the engine and the
embossed mark on the connecting rod (Figure 6-
138, (3)) must face the flywheel end (Figure 6-138,
(5)) of the engine.
Figure 6-138
(1) Fuel Injection Pump Side of Engine.
(2) Piston Identification Mark.
(3) Embossed Mark on Connecting Rod.
(4) Rod and Cap Match Marks.
(5) Flywheel End of Engine.
(6) Camshaft Side of Engine.
4. Reinstall the bearing inserts (Figure 6-140, (1)) in
the connecting rod and cap.
5. Apply a liberal coat of clean engine oil to the
bearing inserts and crankshaft journal.
6. Apply a light coat of clean engine oil to the rod
cap bolts. Reinstall the connecting rod cap
(Figure 6-140, (2)) . Tighten the connecting rod
bolts to the specified torque in two stages (1/2
then full torque). See Special Torque Chart on
page 69 for specifications.
Figure 6-140
7. Reinstall the remaining pistons in their respective
cylinders.