Yanmar 3TNV82A Service Manual page 214

ENGINE
2. Rotate the crankshaft so the crankpin for the
piston being installed is near bottom dead
center.
IMPORTANT
Ensure the piston ring gaps are located
correctly (Figure 6-136).
(2)
1 – Top Compression Ring End Gap
2 – Second Compression Ring End Gap
3 – Oil Ring End Gap
Figure 6-136
3. Using a piston ring compressor, compress the
piston rings.
IMPORTANT
The piston and connecting rod must be
installed with the correct orientation. When
installed correctly, the identification mark
(Figure 6-137, (2)) stamped into the top of
the piston will be on the same side of the
engine as the fuel injection pump
(Figure 6-137, (1)) and the embossed mark
(Figure 6-137, (3)) cast into the connecting
rod beam will face the flywheel end of the
engine (Figure 6-137, (5)).
6-88
(1)
(3)
0001968
Crankshaft and Camshaft Components
4. Carefully reinstall the piston and rod assembly.
Be sure the match marks (Figure 6-137, (4))
stamped into the connecting rod and cap, and
the identification mark (Figure 6-137, (2))
stamped into the piston top are facing the fuel
injection pump side (Figure 6-137, (1)). The
embossed mark cast into the connecting rod
beam (Figure 6-137, (3)) will be facing the
flywheel end of the engine (Figure 6-137, (5)).
(6)
(5)
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
Figure 6-137
TNV DI Service Manual
(1)
(2)
(3)
(4)
0001967