ENGINE
Flywheel and Flywheel Housing
5-40 BY Service Manual
© 2009 Yanmar Marine International
Replace Rear Crankshaft Seal
1. Drain engine oil. See Engine Oil Specifications
on page 3-14.
2. Remove flywheel. See Remove Flywheel on
page 5-39.
3. Remove oil sump. See Remove and Install Oil
Sump on page 8-11.
4. Remove bolt (Figure 5-69, (2)) and crankshaft
sensor (Figure 5-69, (3)). See Replace
Crankshaft Sensor on page 12-24.
Figure 5-69
Figure 5-69
5. Remove bolts (Figure 5-69, (1)) and remove
rear crankshaft seal and housing as an
assembly.
Note: The rear crankshaft seal and housing
are available only as an assembly.
The seal has a protective bushing
(Figure 5-70, (1)) installed and is to be
used during installation. Use only the
supplied bushing as an installation tool.
Keep the bushing as a special tool for
use in future service.
Figure 5-70
Figure 5-70
6. Lubricate the crankshaft outside diameter. Push
the seal housing squarely onto the crankshaft
(Figure 5-70).
7. Install bolts and tighten securely.
8. Install oil sump. See Remove and Install Oil
Sump on page 8-11.
9. Install crankshaft sensor. See Replace
Crankshaft Sensor on page 12-24.
10. Install flywheel. See Install Flywheel on
page 5-41.
11. Add engine oil to the correct oil level. NOTICE:
NEVER overfill engine with engine oil.
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