Yanmar 4BY - Page 98

ENGINE
BY Service Manual
5-43
Flywheel and Flywheel Housing
Stern Drive Engines
Marine Gear Engines
Figure 5-64
3. Stern drive engines: Remove six bolts and
washers (Figure 5-64, (1)).
4. Marine gear engines: Remove 12 bolts
(Figure 5-64, (1)).
5. Remove coupler (Figure 5-64, (2)).
6. Stern drive engines: Remove eight bolts
(Figure 5-64, (3)) and remove coupler adapter
(Figure 5-64, (4)).
Installation
1. Install flywheel holding tool to prevent flywheel
rotation.
IMPORTANT
Ensure all mating surfaces are clean and
dry.
2. Stern drive engines: Install coupler adapter
and tighten eight bolts to specification.
3. Install coupler. Install bolts and washers
(washers used on stern drive engines only).
Tighten to specification.
Drive Coupling Torque
4. Remove flywheel holding tool.
5. Install flywheel housing. See Remove and
Install Flywheel Housing on page 5-42.
000357
5
(
1
)
(
2
)
(
3
)
(
4
)
0003576
(
1
)
(
2
)
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)