Yanmar 4BY - Removal of Flywheel

ENGINE
5-44
BY Service Manual
Flywheel and Flywheel Housing
Removal of Flywheel
1. Remove the flywheel housing and drive
coupling See Remove and Install Flywheel
Housing on page 5-42 and Remove and Install
Drive Coupling on page 5-42.
Figure 5-65
Note: Flywheel bolts are T-60 Torx head.
2. Remove bolts (Figure 5-65, (1)) retaining the
flywheel.
3. Remove flywheel. Inspect guide bushing
(Figure 5-65, (3)) in crankshaft and remove if
damaged.
4. Remove torque plate (Figure 5-65, (2)).
5. Inspect the flywheel for damage. Install a new
flywheel if the ring gear teeth are chipped,
broken, or have become so worn that starter
motor pinion will not engage properly.
Replacement of Rear Crankshaft Seal
1. Drain engine oil.
2. Remove flywheel. See Removal of Flywheel on
page 5-44.
3. Remove oil sump. See Remove and Install Oil
Sump on page 8-16.
Figure 5-66
4. Remove bolt (Figure 5-66, (2)) and crankshaft
sensor (Figure 5-66, (3)). See Replacing
Crankshaft Sensor on page 12-26.
5. Remove bolts (Figure 5-66, (1)) and remove
rear crankshaft seal and housing as an
assembly.
Figure 5-67
Note: The rear crankshaft seal and housing are
available only as an assembly. The seal
has a protective bushing
(Figure 5-67, (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.
6. Lubricate the crankshaft outside diameter. Push
the seal housing squarely onto the crankshaft
(Figure 5-67).
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