Yanmar 3TNV88F Service Manual page 134

ENGINE
6. Reinstall the oil ring expander
(Figure 6-87, (4)). Reinstall the oil ring
(Figure 6-87, (3)) with the end gap at 180° from
the expander end gap.
7. Reinstall the second compression ring
(Figure 6-87, (2)). This ring is identified by its
dark color and tapered face profile.
8. Reinstall the top compression ring
(Figure 6-87, (1)). This ring is identified by its
silver color and barrel-shaped face profile.
The oil ring expander (Figure 6-87, (4)) end gap
must be located 180° from the oil ring
(Figure 6-87, (3)) end gap.
Figure 6-87
9. Stagger the piston ring end gaps at 120°
intervals (Figure 6-88, (1, 2, 3)). Do not
position the top piston ring end gap in line with
the wrist pin.
6-50
NOTICE
4
K0001722B
Crankshaft and Camshaft Components
1 – Top compression ring end gap
2 – Second compression ring end gap
3 – Oil ring end gap
1
■ Installation of crankshaft
2
1. If removed, reinstall the keys and timing gear on
the crankshaft.
3
2. Reinstall new bearing inserts (Figure 6-89, (1))
and thrust bearing (Figure 6-89, (2)) in the
cylinder block and main bearing caps. Apply a
liberal coat of clean engine oil to the bearings
and crankshaft journals.
3. Place the crankshaft into the engine.
The main bearing caps are numbered and have
arrows for proper positioning. The No. 1 cap is at
the flywheel end. The arrows point toward the
flywheel end of the engine.
4. Reinstall the main bearing caps
(Figure 6-89, (3)).
1
2
K0001968
Figure 6-88
NOTICE
3TNV88F Service Manual
3