Flywheel And Flywheel Housing; Remove And Install Flywheel Housing; Remove And Install Drive Coupling - Yanmar BY Series Service Manual

ENGINE

FLYWHEEL AND FLYWHEEL HOUSING

Remove and Install Flywheel Housing

1. Disconnect the negative (-) battery cable from
the battery.
2. Remove the marine gear or stern drive (as
equipped).
Stern Drive Engines
( 2 )
( 5 )
Marine Gear Engines
( 2 )
( 5 )
Figure 5-63
3. Remove two bolts (Figure 5-63, (1)) and
remove starter motor (Figure 5-63, (2)). See
Remove and Install Starter Motor on page 10-7.
5-42
( 5 )
( 4 )
( 6 )
0003573
( 5 )
( 4 )
( 6 )
0003574
4. Remove bolts securing oil sump to flywheel
housing.
5. Remove 11 bolts (Figure 5-63, (3)). Remove
housing (Figure 5-63, (4)). Use care not to lose
the two alignment sleeves (Figure 5-63, (5))
and dowel (Figure 5-63, (6)).
6. Clean mating surfaces. Install alignment
sleeves and dowel in flywheel housing.
7. Install flywheel housing.
8. Install washers on the M10 x 130, M8 x 130,
and M8 x 40 bolts.
9. Install 11 bolts and washers. Tighten in two
stages to specifications.
( 3 )
Flywheel Housing Torque
Item
M12 Bolt
M10 Bolt
( 1 )
M8 Bolt
10. Install starter. See Remove and Install Starter
Motor on page 10-7.
11. Connect battery negative (-) cable.

Remove and Install Drive Coupling

Removal
( 3 )
1. Remove flywheel housing. See Remove and
Install Flywheel Housing on page 5-42.
2. Install flywheel holding tool to prevent flywheel
rotation.
( 1 )
Flywheel and Flywheel Housing
Initial Torque Final Torque
15 N·m
(133 in.-lb)
BY Service Manual
80 N·m
(59 ft-lb)
46 N·m
(34 ft-lb)
23 N·m
(204 in.-lb)