Yanmar 6BY2 - Remove and Install Drive Coupling

ENGINE
Flywheel and Flywheel Housing
5-38 BY Service Manual
© 2009 Yanmar Marine International
Remove and Install Drive Coupling
Engines with Marine Gear
Removal
1. Remove flywheel housing. See Remove and
Install Flywheel Housing on page 5-37.
2. Install flywheel holding tool to prevent flywheel
rotation.
3. Remove 12 bolts (Figure 5-66, (1)).
Figure 5-66Marine Gear Engines
Figure 5-66
4. Remove coupler (Figure 5-66, (2)).
Installation
1. Install flywheel holding tool to prevent flywheel
rotation.
NOTICE: Ensure all mating surfaces are clean
and dry.
2. Install coupler. Install bolts and washers.
Tighten to specification.
Drive Coupling Torque
3. Remove flywheel holding tool.
4. Install flywheel housing. See Remove and
Install Flywheel Housing on page 5-37.
Engines with Stern Drive
Removal
1. Remove flywheel housing. See Remove and
Install Flywheel Housing on page 5-37.
2. Install flywheel holding tool to prevent flywheel
rotation.
3. Remove six bolts and washers
(Figure 5-67, (1)).
Figure 5-67Stern Drive Engines
Figure 5-67
4. Remove coupler (Figure 5-67, (2)).
5. Remove eight bolts (Figure 5-67, (3)) and
remove coupler adapter (Figure 5-67, (4)).
Installation
1. Install flywheel holding tool to prevent flywheel
rotation.
NOTICE: Ensure all mating surfaces are clean
and dry.
2. Install coupler adapter and tighten eight bolts to
specification.
3. Install coupler. Install bolts and washers.
Tighten to specification.
Item Initial Torque Final Torque
M10 Bolt
15 N·m
(133 in.-lb)
46 N·m
(34 ft-lb)
M8 Bolt
23 N·m
(204 in.-lb)
0006514
(
2
)
(
1
)
0006515
(
4
)
(
3
)
(
1
)
(
2
)